WREN release history

in version 2015.5.31.0

  • NOTE: The memory management was changed, the borlndmm.dll is no longer needed – and it is not available for download anymore. This needed some code changes here and there and I may not have touched all affected places, please report bugs on the forum, will fix ASAP.
  • Added a debugging aid — Find small values — to help find possible calculation bottlenecks in a patch. This can be accessed from the action menu or from the Debug Screen [F5]. This feature will search for values that are either denormal or are in the range (-1e-50 … 0) or (0 … 1e-50), small values being not zero. Hit F10 to highlight the modules having such values on their inputs / outputs or as internal signals. In the Debug Screen [F5] a listing will be made of the found modules and the pin / knob names found (Name [Title] [inputs] [outputs]), knobs are listed as inputs. For compiled versions that have profiling support (which the regular releases do not have) the small value finder is part of the profile action.
  • Changed ranges a bit for knobs in dB modes and for Mute buttons – these are off now when their value is <= -140dB. Changed the dezipper algorithm in the same way, values <= -140 dB result in zero.
  • Made an option to allow for undo after a patch was saved, it is off by default. Likewise added an option for undo after load.
  • Tab order of form and module elements sorted – some elements do not properly show focus, that needs a fix too.
  • Cleaned out the source code a bit, removed unused units from the project, unused code from units, etc.
  • Experimented with allocating memory in large chunks. This was not really a good idea; having many smallish chunks performs better. Anyway, that idea is tested now.
  • Added user definable scales for the SeqRandom module, these will be loaded from a file wren.scale which must be in the same folder as the Wren executable file. When this file does not exist Wren will create it, after that you can edit it with a text editor (like Notepad for instance) and Wren will not touch it anymore.

    For example:
    scale definitions text scale definitions view
    A Line like
    "-", []
    (which is a dash for the scale name and no notes in the scale) adds a separator to the selector's popup menu.
    This unfortunately will likely break existing patches, in that for the SeqRandom a different scale will be loaded than was saved into the patch. Also this will make patch sharing a bit fuzzy as there may be a different set of scales in effect — but then again, such already was the case for wave players and Talkie files as well.
  • Some designer changes: added a 'DynamicStepCount' property for TKnobsValuedControl and for TKnobsXYControl. When this field is set to true (by default it is false) and the value for the control goes over StepCount - 1 StepCount is fixed to value + 1. This was needed to make the user definable scales work properly. This is also used for ModTalkie to allow it to have more than 32 voice banks. Also added a design time field '_DesignerRemarks' on TKnobsValuedControl and TKnobsXYControl, this is just a comment field, it is not used at run–time.
  • Added Dyads and Triads to the default scales for SeqRandom. Should make it easier to program scale modulations using chained SeqRandom modules.
  • Made Picture and Docs properties for modules, so that information is no longer in TImage / TMemo components in the designer, which cleared stuff up a bit there.
  • Added a help item to the module popup menu showing the help text in a message box instead of in the web browser.
  • Edited help texts a bit to get the greatest nonsense out.
  • Had some inputs exchanged on the audio rate square OSCs – PWM was not working – fixed now.
  • Changed the memory manager – this revealed some allocation and de-allocation issues, Like freeing something in the Median module that was also freed by the system. Some more things like that … anyway, trying to get rid of the memory manager DLL, reasoned that it would not be needed. Ah, and in allocating a new synth patch as well.
  • Changed the knob ranges for the SeqRandom module slightly, to be able to better set fractional values.
  • Freq input was not found on Pluck module, stopping execution of the user interface. Added the forgotten freq input. Also added some exception trapping to make connection errors issue a log item only and to not prevent the system from running the patch. The wires will still be there in the editor (and they will be saved on a patch save), it is the compiled patch that does not know of the input, and so the connection will not be made.
  • Made the program write logs to a log file (wren.log in the application directory). This feature will be always on at program start, but it can be set disabled from the Settings Screen [F3], which will cause the feature to be turned off once the settings are loaded from the ini file. If the file exists it will be erased at program startup, so there will only be a log of the most recent program run.

    Example log:
      00:00 000 probing PortAudio DLL presence, looking for "portaudio.dll"
      00:00 319 PortAudio DLL found
      00:00 321 probing FFTW DLL presence, looking for "libfftw3-3.dll"
      2015-05-30 12:36:43:622 compiled synth patch
      2015-05-30 12:36:43:656 starting  PA [api: "Windows DirectSound", in: "ADAT 1 (1+2) (R ...
      2015-05-30 12:36:43:684 PortAudio was started
  • Made Graphs Screen [F4] to be invisible by default, it can be enabled in the Settings Screen [F3]. Changed the drawing of the main PageControl a bit so it does not show the nearly invisible tabs anymore (there were a couple of pixels in the top left).
  • Removed the About Screen – program information can now be found on the Settings Screen [F3]. The About button there and the About item in the Help menu now go to this site.
  • Bugfix on Pluck module, on FM modulation it could end up with a negative array index, causing a program crash.

in version 2015.5.12.0

  • Bugfix for crash at 00801B75 ... code tried to read data from a synth patch that did not exist.

in version 2015.5.10.0

  • Changed the knob ranges for a lot of modulation attenuators … old patches will need some work … especially FM control for oscillators. The new ranges make it easier to set fractional values, like 0.5 etc. I'd probably need to change the patch format so that it stores values and not knob positions, so that on an internal change it could find the closest value. I had that before, but it was messy, so don't know.
  • Made a RangeConverter module, or a linear mapper. For each input the selected input range is mapped onto the range set by the low and high values knobs. The input ranges are chosen to map the standard LFO output ranges.

    range converter module

  • Added a four channel mixer MixQ1to1.

    quad 1 to 1 mixer

  • Changed the layout a bit for MixM4to1 to make it clearer what are mix inpits and what are level control inputs — hopefully.

    4 to 1 mixer

  • Added a new tab on the module selector – 'Note' – and moved some modules into that from the Control tab, it was getting a bit crowdy there.
  • Fixed an issue with knobs: with a high opacity setting the red rectangle indicating selection would not be visible.
  • Changed knob painting a little to remove the faint rectangle it would always show.
  • Changed VU meter peak and valey indicator fall-off rates to be more consistent over various sample rates, buffer sizes and channel counts.
  • User set lights update rate was not restored after program restart – so it used a fixed value of 43 ms … until the setting would be manually changed — fixed now.
  • Added a new connector and wire color, Lime (bright green), to indicate control rate logic signals. Changed several modules for that.
  • New wave types for LFO's — 'Random Square' and 'Random'. The 'Random' type is white noise.

    lfo random pulses lfo random wave

  • Fixed bug in template support – loading or saving a template would change the internally stored filename of the patch so that a later save action would overwrite the template and not the patch. Also made the filename visible again in the window title. Filename and patchname can be different …
  • Changed the help for the Pulses module to explain why it does not always listen to the frequency setting, also changed the default mode for it to not be 'Async'.
  • PinkFilter had denormals – fixed now.
  • The denormal preventer itself would create denormal exceptions during debugging when the value passed to it was a denormal already, changed the code to first check that condition (in debug mode denormal checking is on to be able to find such issues) – fixed now.
  • Added signal normalization to all mixer outputs.
  • Changed sensitivity of PM input for ModResonator to be 32 times less sensitive. With the previous settings subtle modulations were impossible.
  • Added patch changed warning on loading a new patch or a template. This can be disabled in the Settings Screen [F3] – 'on load warn for patch changed'.
  • Starting to add un-attenuated frequency control inputs to modules, sofar Osc, Square, Pluck, OscTrig, SquareTrig, SVF and HrastSVF. These will just be added to the value set by the frequency control knob(s).
  • Changed the detection for unconnected modules. When a module has no connectors it is regarded to be connected. When it has no outputs it is regarded to be connected when an input is connected. Finally when it has outputs it is regarded to be connected only when an an output is connected.
  • Added pass-trough mode to the mute buttons of the FreeVerb and GVerb modules.
  • Changed the order of items in the module popup-menu to make it less likely to delete selected modules by accident.
  • Added input level control for Resonator module, as it is way too loud for non impulse like inputs. For single sample impulses it's fine at 0 dB.
  • Added a debug like thingie that can be turned on in the Settings Screen [F3] – 'show lights time' which for each update cycle shows the amount of time spent in updating the lights in the user interface. This can help to set the 'update rate for lights' parameter – it would not make sense to set the update rate higher than what the system can handle.
  • Fixed bug in 'Recent Files' mechanism, menu items were not freed but deleted only – this led to memory corruption on patch load / save actions.
  • Added input type selector for Pan and XFade modules. Default type = [-1…1] to keep existing patches compatible.

    pannner module cross fader module

  • Added a new pitch shifter module which can be accurately tuned in semitones and cents. It has exponential pitch modulation and the delay length can be set to make a trade–off between quality and delay. This is a delay line based shifter, not an FFT based one, meaning it will have some 'clasical artifacts'.

    pitch shifter module

  • Changed some memory allocations to make sure they are atomic and non blocking on the real time thread. Eventually all should be made like that, but some were a bit easier to do …

in version 2015.4.25.0

  • When I googled for Delphi gverb I got this page back pretty high … which prolly means I should actually make that gverb thingie (as there seems to not be a Delphi translation for it yet) … in fact I just did a code translate on it … a bit more work needed to make a module and then some testing of course. Would love to hear an FDN based reverb …

    Ok … here is a proto … its not 100% stable … when I change the max room size from 1000 m2 to 0.01 m2 in an instant it can produce invalid floats. Changing the relative (actual) room size is OK though, and added a modulation input for that for some nice effects. Also some oddities with the spread control still, on a patch recompile spread goes to zero it seems. Spread and Max room size are non-realtime controls, and will give zippery side effects.
    The issue with sudden max room size changes got fixed, there was some out of array memory addressing. The issue with with the spread control stay, and when the effect runs for a long time the signal levels will explode.

    Ok, spread control is fixed, there was an issue with initialization order. Also found a way to control the 'explosiveness', this was related to room size modulation, by changing the amplification factor in the FDN matrix thate is control, setting it to 0.45 instead of 0.5 seems to work without altering the sound too much. Also reduced the zipper effect a bit on changing the max roomsie and the spread by flushing all internal data on changes.

    Changed the maximum room size to be 6400 m2 and the maximum reverb time to 30 minutes with an amp factor of 0.46 currently — seems stable, 0.475 was unstable.

    Changed the spread control to multiply by 100 before it gets into the actual gverb code, the control still goes from 0 — 1. with 180 it would try to make negative length delay lines, I calculated 160 to be the limit, Super Collider seems to allow for a maximum of 100 … the web is not clear on this … I thought one to be pretty wide already … oh well 100 it will be.

    Added modulation inputs for damping, reverb time, tone, early level, tail level and dry level. These are all clipped into a [0,1] range and multiplied by the knob setting. So the knob sets the maximum value, the modulation can lower that only.

    Added a mode parameter to select between rounded or relatively prime length delays amd between the original and an alternate FDN matrix. See the module help for details. Differences are quite subtle, mode 1 is most edfficient computationally.

    The GVerb port is in the released Wren now and in the published source code too.

    Settled on the following ranges:
    • MaxRoomSize from 1 to 6400 m2
    • RoomSize internal minimum is 0.01 m2, Roomsize is a fraction 0 to 1 of the maximum size, but it will never go under the internal minumum. It is possible to get some glitchy results with this still, but that seems nice …
    • Spread ranges from 0 to 1 but is internally multiplied by 100.
    • Reverb time is from 5 ms to 30 minutes.
    • FDN matrix multiplication factor is set to 0.43, which has been stable here for a couple of days now under wild modulations. The alternate matrix uses 0.73.
  • Made the Average module clear it's internal state on a system reset, so that it's outputs will always start at zero after reset. This way an averager after a constant module will always make a smooth start from zero on it's LP output after a reset, and the HP output will always make an initial spike under those conditions.
  • Removed the dezipper action fom the Constant module's mute control so it can be used as an on/off switch.
  • Found some addressing bugs, where indexing constants from one module type were used in another … changed the scoping of the indexing constants so that such a thing can not happen anymore.

in version 2015.4.12.0

  • I seem to have fukt the Vocoder, it is way too loud … hmm … I had changed some math to a complex data type … innocently enough it seems … build 103 seems to be ok still. Ok it was in the Convoder instead where I forgot to divide by the Attenuation factor needed (16777216 so there is the reason to be LOUD) … got fixed for this release.
  • Made a version check in the help menu, and also added button for it on the about tab. Using your default browser it will bring you to the Wren web site which will then do a version check based on the Wren version passed to it,
  • Added a light left of the CPU load indicator that lights up red for a couple of seconds when any internal audio buffer over or underflows occur. The CPU load can go above 100% before this will happen. And conversly it can go red when the CPU load is below 100%. Not that you'd not have heard it … but still … it may show the actual cause of odd things happening … my algorithms being too slow …
  • Changed the FreeVerb parameters (for the Reverb module) to their original settings, but as they are recalculated when the sample rate is not 44k1 the selected parameters may not be the best (i.e. not relatively prime) — this may need some more coding.

    For example see the JCRev implementation from the Synthesis Toolkit (this one sets the next available prime value for delay lengths recalculated for new sample rates). Might also want to implement JCRev as a 2nd reverb algorithm. Still need to do some tests on this … I did not like the reverb very much as it was … too much high frequeency tone like stuff is/was going on to my taste.

    Another one to look into could be gverb. Gverb also enforces the delay lengths to be prime. There are some other similar implementations around, some simpler (so less CPU cycles needed). For some examples see the Artificial Reverberation section at ccrma.stanford.edu.

    It seems better now, ensured all delay lengths to be prime, but no check was made to see if they are relatively prime, so under some conditions two might end up having the same length.
  • Changed the 2to1 switch, it actuallly is a 2to2 switch now connecting (in1,in2) to either (out1,out2) or (out2,out1) depending on the selection input.

  • Added two new modules, DigiMux and DigiDemux, for which the routing is sleected by a couple of digital selection inputs. A bit like the CMOS analog switches, except they are one-way only in Wren of course.

  • Added a zero / hold mode selector to the DigiDemux which in hold mode causes the last output value the be held when an output gets deactivated. In zero mode the output value will go to zero.

  • Added a programmable frequency divider. A low division and a high division factor can be set and with the select input it is possible to change the division rate between these two values. A step value can be set as well, the amount to add to on each increment on the division factor.

in version 2015.4.6.0

  • The global tuning parameters were not working properly, fixed that.

in version 2015.4.4.0

  • Removed all Jittik scripting stuff — took too long to get it stable — must be a bad idea.
  • Made peak (black) and valey (white) indicators on main VU meters. The peak indicators are dynamic, the valey indicators show the lowest value seen since last reset (to reset click on the textual representation for the min / max values). The peak and valey indicators currently are mono, i.e. the same for left and right, taking the extremes of left and right values. Changed the colors for peaks and valeys, peaks are white no and valeys black.
  • Sanitized the VU code a bit, and made the peak and valey level indicators to work per channel instead of Left / Right combined. Also added a valey value label for each pair of channels. The labels still show the extremess of the Left / Right pair.
  • Recolored the Seq16 module chain input and the out output to red make it show those run at audio rate. With the xfade feature set to one these can be used as user programmable wave forms.
  • Renamed parameter pasting into value pasting.
  • Changed the bitmaps and painting for knobs so that they will be painted better on non gray-ish backgrounds too now.

    The red box to indicate the knob being focused (and processing keyboard input) is now drawn around the knob as well, instead hiding behind it on the right and bottom sides. The up/down clickers were resized a bit to make rtoom for that.
  • MIDI modules were not working anymore, forgot to make them control mode modules after the slow / fast mode changes in the previous release — fixed now.
  • Changed internal scaling for envelope times to not use a time in seconds anymore but a a range [0,1] which makes it easier to have properly working time modulations. Some existing patches probably will need envelope parameters to be changed (only when the use time modulation).
  • Added a pattern module, meant to be used for rhythmic figures in a more compact way than can be done with step sequencers. Basically it is a set of eight dividers, when a divider is started it will copy the trig input to the output on the first count only. Then when the divider counted down to zero a next divider will be searched, skipping all dividers with a count set to zero. When all dividers have their count set to zero there will be no output pulses.

  • Added an EuclideanScale module, a bit after what Kyma has in version 7, can set the number of divisions for the octave, and then a pattern selection can be applied to that. An ocatave still spans a factor of two with this.

  • Added an Interpreter module, it executes forth code at control rate. This is experimental, undocumented and subject to change. For now eight inputs are put onto the forth stack. Then a deferred forth word is called from Wren. This word can be hooked by custom forth code and that code should pop the stack values to do something with them. Outputs can be set from code by calling a predefinedootput word whenever such is needed.

  • Added a Convoder module. This module performs multiplication in the frequency domain which is equivalent to circular convolution. Nothing very speciall but it can give some nice reverb like sounds based on its input signals. It can sound a bit vocoder like too when used on speech signals.

  • Added a logic selector module, that when the select input is inactive passes its inputs A resp. B to its outputs A resp. B. When the select input is active it passes inputs A resp. B to outputs B resp. A (i.e. it swaps the signals then).

in version 2015.2.26.0

  • Had an integer overflow in the Seq16 module when the module did not get clocked. This would stop sound generation in a particular patch after about 6 hours. The Integer is a counter used to measure the time between clocks and is used for interpolation. I've put a cap on it's value
  • Implemented value pasting, but did not test it yet. The idea is to select some modules, then do a copy to clipboard for those. Then select the same module structure elsewhere in the patch, or in anoter Wren incarnation's patch, and then paste the values over to that selection to get identical knob settings there. One could copy over the steps from a set of sewuencers to another set of sequencers for instance.
    It seems to not work yet, more later. Ok, there was an error for checking structural equivalence.
    It works now.
    • Made ModCompressor about 5 times as fast by getting some calculations out of the loop and optimizing the remaining ones a bit.
    • Sped up LFOs by about 10%.
    • ModReverb was sped up by about 15% — also changed the execution order of the allpass filters to be the same as in the original code, not sure if that would change anything (sound wise).
    • Sped up envelopes a bit by using table lookups for the power function.
    All in all that got about 10% off from the current patch's CPU load.
  • Re-implemented the FIsSlow mode request flag. A while ago I had settled on executing all modules in slow mode and only the ones needing fast execution in fast mode as well (with the FIsFast flag). With the reintroduction of the slow mode flag it is possible again to have fast mode only execution. I'm getting more detailed profiling information this way and patches seem to perform marginally better too. Module constructors need to now set Fast and / or Slow mode request flags always or their DoTick and / or DoSlowTick method will not be called (the TMod base module is neither fast nor slow). [Slow being control rate / blue signals, fast being audio rate / red signals].
  • Found hat denormal numbers could occur in SVF (again) and in FreqShifter modules resulting in stuttering for some settings. Added some Normalize calls to fix that.
  • CSV player would play 11 channels only instead of the 16 it was designed for — fixed now.
  • SVF Q calculation was wrong, changed it. It is still wrong but at leeast it is the same as on the Hrast Filter now (I should change both to use 1 / Q internally instead of 1 — Q … or maybe not … to not break patches).
  • Added a clocked delay module.

  • Added a bottom label to he graph to show timing to be in milli seconds (for some reason I always think it to be micro seconds), also added checkboxes to enable or disable individual traces.
  • Changed Pad module looks.
  • The Filter bank does not work yet.
  • Could use a SeqRandVals analog to SeqRandom, but then for random non-note values — no need for that, it is easily patchable.

in version 2015.1.31.0

  • Got some 15% off from the execution time of the FreqShifter module, still not understanding really why it takes so long to compute. Well … 70 to 80% goes into the calculation of the Hilbert transform … but then again that's just about 100 multiply / add instructions. The vocoder does a lot more than that in about the same time. Hmm … maybe the vocoder does not do that much more … also looked at the compiled code for the FreqShifter, it is not that bad really, so this is it I guess.
  • Mute on Square and SquareTrig modules was not working, fixed.
  • Triangle amplitude was a factor four low after the anti-alias modifications, fixed now (for Osc and TrigOsc modules).
  • Pad module, with an X and an Y output, both simultaneously controlled with a mouse drag.

in version 2015.1.23.0

  • When the FFTW DLL is not present some patches will not work. They will load though but they can not be compiled. When an old compiled patch was in memory that one will keep playing, and when there was no patch there will be silence … will need to issue a message for this situation. For now it will be the vocoder module only causing this issue.
    I've changed things so that an affected patch will load and compile but any FFTW dependent modules in it will just do nothing — a one time warning will be shown for this situation.
  • When words.lpc is missing and a Talkie module is used there will be a NULL pointer issue. I've changed the code a bit such that the Talkie module will show 'words.lpc missing?' in it's bank selector control when that file could not be found, or when it could not be interpreted. The file will be looked for in the Wren executable directory. Will try to get some better diagnostics on this at a later stage (for the case of parse errors).
  • Bugfix for SeqRandom, when 128 notes were in the scale there would be an integer overflow.
  • Added an exponential FM input for Talkie, and put a frequency range clip on it from 0 — System_Rate / 2. With no FM connected it will behave like the previous version. Also changed the layout a bit to create room for more controls. Added a bank select input, which when it changes value will overrule the manual bank selector control. Also made it work a bit different, Talkie will now only say something when it sees an upgoing edge on the start input (and it is no longer possible to change the phrase (or bank) while Talkie sqeaks).
  • Added trigger mode to SR FlipFlop, so it can now be edge or level triggered. The default mode is edge triggered for compatibility with old patches, However I also changed the workings a bit such that when a reset condition is present that will always overrule the set condition.
  • Implemented anti-aliasing for all audio rate oscillators. Algorithm based on this article about polyBLEP and the implementation of the HrastOsc, which uses a form of polyBLEP as well. I've added a band limiting level control, with a default level of about 1.5 — this will change the sound for existting patches — for better usually. For some special cases like modulating a delay line or a nicely whistling patch you may want to set the B-Limit control to zero. For high pitched voices you may want to nudge it up a bit from the default value.
  • Some stability issues with the anti aliasing code, had to mod the code a bit for that — copied from HrastOsc. The BLEP stuff did not like phase accu bound over/under-flows at all.
  • Added a 'friendly' label field in the designer for value controls, so the text in popups can be a bit more descriptive — filled in some, not all yet.

in version 2015.1.18.0

  • Moved TerraGen module from Osc tab to FX tab. Reorganized LFO tab a bit. Made a couple of modules a tad smaller.
  • Changed the Debug Screen [F5] and Settings Screen [F3] a bit so they only have the buttons needed locally in the right pane.
  • Clipped all PWM to be in an interval of [ 0.01, 0.99]
  • I renamed a 'reset' input pin to 'res' on one of the sequencers, on reloading a patch with that you may loose connections — I will not fix that, and will keep the patch version at 2 as well — sorry about that.
  • Experimenting a bit with Talkie. And … we have liftoff — Wren speaks! Now I need to think about how to select what to speak from the 1200 or so letters / numbers / words / phrases available. When Talkie grows up it may look something like:

    I settled on that FTTB. Phrase selection is messy, but for random phrases its ok now. I like this module :-) Frame speed is liniarly modulatable between 0 anf 80 Hz, sample rate is liniarly modulatable between 0 and 16 kHz.
  • Would like xfade on seq16 module … it would need to calculate a time guess between steps … hmm … it would act one step late then on tempo changes. Ok, it can actually calcultate a period estimate on each clock edge, and it can be made such that when the xfade factor is zero it would not delay. It can however produce large over and undershoots then when the actual period changes fast. This can be clipped though, such that the final value is just reached early (or late …).
    With that I think I found a reasonable implementation for the single sequencer case (it works on direction reversal too). Should check it to work for chained sequencers as well, which probably it does currently not, but this may be possible.
  • Experimenting with a Sequencer Sequencer now, to make chained seuencers more reliable and easier to set up. Especially with interpolated sequencing.

    This seems to work well for chained interpolated sequencing too (although there still is a reset related issue). The clock speed is very high, to not have to wait too long for a trace to be made.

    Top trace is clock in (trig), then clock out (trig, with bit of delay). The orange track is reset. Then the enable for the top sequencer (for 16 steps), purple is the enable for the bottom sequencers (8 steps). Green is the output of the top sequencer, blue the output of the bottom left one (not cross faded) and the the red trace is the 100% cross faded output of the bottom right sequencer. (The bottom two sequencers have the same step settings to be able to compare crossfaded and normal signals.)

    Only the last sequencer in chain should have the xfade turned up, it will handle the upstream sequeencers too then.

    An asside: It is interesting to see how close this is to multi-stage envelopes, only the sustain phase is not there. With a small mdification on the trigger LFOs this could be done too, they would need a hold input only. The sequencer inerpolation could easily be made exp or log as well, might do that anyway.

    Ok, that works … now the backwards stuff … seems to be working too :-)

    Except reset is not perfect yet when running backwards … when the last sequencer has less than 16 steps the sequencers before will not start on the last step.

    There seems to be no such thing as a perfect reset, I've added a couple of reset modes for the SeqSeq module each having a different effect on how on how patterns will be played.

in version 2015.1.4.0

  • Removed vocoder startup glitch.
  • Made sliders, a 16 step sequencer would fit now.
  • Made an audio mixer with two busses, 8 mono inputs with pan control and two bus level output controls. Also added mute and solo buttons on the inputs. It is chainable for when more inputs are needed. The first solo button seen will be the effective one, and an active solo will suppress solo actions in a chained module.

  • Varous issues with clocks. Square oscillators and LFOs started with a low output instead of a high, divider module would start on a down going edge and the Counter had a wrong start state. Sequencer would not always reset on short reset pulses. Also there were some race conditions in the Divider and the Counter making reset give unexpected results. Also the Sequencer output was one step off, at least … after the other fixes … GateSeq needed some mods too to make sequencer sequencing working, and its reset did not work nice either.
  • Added random and clear buttons to sequencer, added an active input as well to allow for sequencer sequencing.
  • Added active input to GateSeq to allow for sequencer sequencing.
  • Added reset input to Divider module to be able to use it for sequencer chaining. The example patch here shows how to make a 16 step sequencer out of 11 step sequencers — this is scalable to 16 sequencers, and to different sequencer lengths as well.
  • Added lights for GateSeq steps, added Clear and Random buttons as well.
  • Added a button left of the control panel with the main volume controls to quickly hide and get back those controls (near the top).
  • Added a direction input for the GateSeq.

  • And there it is … added a seq16 module. This one can sequence notes or values, it can be used for sequenced sequencing. It has a direction input and a random and clear buttons.

  • Directional sequencing is not direcly compatible with sequencer sequencing as shown in the image to the right. You'd need more logic for that, try to use a GateSeq instead of the Counter.
  • Source code release.
  • so anyway … your typical 41 step sequencer with gates, trigs, notes, volumes and filter cutoffs would look like:

in version 2014.12.30.0

  • Added a VU meter clear on audio stop option, the option is on by default. Also can double click on any VU to clear them all.
  • Some code refactoring for file selectors and display editors into a TKnobsTextControl widget.
  • Images for mute buttons
  • Increased maximal compresssor gain to 64 dB.
  • Color modulation for most noise modules was not working, fixed that.
  • Added a basic vocoder. Note: this needs the The FFTW DLL to be present.
  • Support for two template files, a save function in the file menu and two load buttons in the editor. Also added export to file for selected modules and import from file to addth modules in tha tfile to the current patch … however that still sucks as the added modules will not go into drag mode …

in version 2014.12.22.1

  • Source code release.

in version 2014.12.21.0

  • MidiPlayer needs reset input and done output, the system reset does not work on it properly either.
    Changed channel offsets, depending on midi file type, ch 1 will be the first usable channel, skipping the meta channel for type 1 MIDI files. Added reset and done, fixed reset issues.
  • Issue with channels on MIDI modules, fixed now.
  • Program crashes on exit with incoming MIDI it seems, put a gard on that.
  • Issue with MIDI command processing on other channels than ch 1 — thank you Steve for testing :-)

in version 2014.12.20.1

  • Oh fuck … and now it does not start properly when an ini file is present, selected devices are forgotten. Ok, it will in Legacy mode, but not for PortAudio mode.
    Ok, seems to start now properly with and without ini file and it seems to remember the device selections for both legacy and PortAudio modes properly noww.

in version 2014.12.20.0

  • Added 'lowest' and 'highest' value outputs to Median module. Also allowing now for even valued settings for the bin size — a binary or trinary sorter can be made this way. Note however that an even setting for the bin size results in the median being the average of the middle two values (after sorting) and thus that this needs not be a value that was actually present in the input stream. The lowest and highest values will always be values that were present in the input.
  • Working on a simple MIDI player thingie — implementation will likely change.
  • There was a memory allocation still left in the Median module's DoTick method, removed that one. It caused occasional runtime errors.
  • TransInv module could do an occasional division by zero, fixed.
  • SeqRandom does not recalculate the scale after a scale change, it needs the range to be changed or the transposition. A patch recompile also works. Fixed that.
  • The MIDI CC output module had no synth binding, making it unusable, fixed that.
  • 2014-12-19 : Need to review Reset behaviour, the response to the Reset button. It may not actually cause a change in output values for some modules?
    The envelope modules did not set their envelope values to zero after a global reset indeed, fixed now.
    This may not not be completely fixed yet … reset should last for 'system_rate / control_rate' periods I think.
  • When wren.ini is not present things will go wrong terribly … made it survive that situation.

in version 2014.12.17.0

  • I've installed Asio4all … ever since the RME ASIO driver works too, and I have 8 in and 8 out channels available :-)
  • Not all channel dB labels were updated, fixed that.
  • Added an ASIO control panel button on the device selection screen.
  • Added an audio test button on the device selection screen.
  • Added ASIO channel selection on the device selection screen.
  • Some bug fixes in device selection, and a better reset after device changes … such that the device test function could actually work without restarting Wren.

in version 2014.12.12.0

  • Better colors.
  • Bug in TimeToSeconds routine, the conversion produced an invalid index. Fixed it.

in version 2014.12.11.0

  • Added a couple of new modes for the Constant module, one of them being Note mode, for easier note selection.
  • Changed LfoTrig Ready ouput to only fire after a cycle was ran, and not just when being idle.
  • Added a TransInv module for note Transposition or Inversion, it can do so with a modulo operation being applied.
  • Found a better way to color modules. In the Settings Screen [F3] you can set a default color and an opacity value which determines the color intensity.

in version 2014.12.10.0

  • Added a GateSeq module, an event sequencer with per step 'off', 'trig' or 'gate' mode select.
  • Added a Pulses module, generates pulses with random intervals, either synced to an internal clock or free running. The 100th module type!
  • Added Exponential random distribution and Lambda control to RandomWalkLFO module, as a sort of jumpiness control.
  • Added Exponential random distribution and Lambda control to RandSig module, as a sort of jumpiness control.
  • Added a search option for un-connected modules (in the Edit menu, or use Ctrl+U).
  • Frequency range selector for RandomWalk LFO was not working, FM was not working either, fixed.
  • Put a guard on negative module top offsets to avoid ghost modules to be in the patch. This might solve bugs 2014-11-28 and 2014-12-08. Some old patches may look a bit strange after loading, as any ghost modules will be made visible now.
  • Changed the patch writer such that it will no longer write out modules with negative X or Y positions, it will instead shift all the modules by the largest offset it found.
  • Some bug fixes for sequencers and for the morse generator for division by zero and an undefined string index respectively, these were related to Port Audio and thread issues. Same sort of issue with XYScope, fixed too by making history an internal signal instead of a patch signal.

in version 2014.12.6.0

  • Error in Delay module. When using PortAudio the setting of the delay length is from a different thread than the module execution. It did happen that way that the memory would be invalid at execution time. Fixed this.
  • Some issues with memory allocation for delay based modules and the EuclidianRhythm module. Memory was allocated and de-allocated form the audio thread. I changed that. Ah, and also the Under/Overflow debugging was a violation … moved those to the Lights updater (out of the audio thread). That way the normal memory manager can be used it seems — except maybe for debug messages — hmm … nope it can not.
  • Changed the implementation for multi channel such that it will open up to 8 input and output channels but never more than the Port Audio interface reports to be present. In theory this should give multi channel IO under ASIO (at least with my RME fireface UFX — except that ASIO refuses to work at all with it). Currently there is no way to specify which channels will be used though. I did some measurements on audio round trip times, see here for some results on my computer — not breath taking, but better than it used to be.
  • Device selection sucks … it is needed now to restart Wren when other Port Audio devices are selected — there is no need for that really, it is a bug. Changed things a bit, this seems to help. Also moved the buffer size selection to the wave device selection dialog.

in version 2014.12.3.0

  • Improved XY scope a bit, it's not super but it found some bugs for me already.
  • Added a Compare module for signal comparisons, > = and < outputs. Equality holds when the inputs differ no more than the value set by the equality range control.

  • Added a 12 to one cross fading multiplexer.

  • Added a HardClip module for hard signal clipping, not really meant for audio distortion but more for signal conditioning.
  • Bug in delay module where the longest delay setting produces no signal output at all (on the variable delay time output). Fixed it, the interpolation code was wrong, every exact integral delay time (in terms of sample counts) would produce silence as the output on the variable delay time output.
  • Bug in the RandSig module, it should produce smooth glides from one random value to the next, but it has jumps in the output value. Ok, solved, it was smooth for the special case of non inverted full output swing signals only.
  • Bug in cents calculations, for oscillators a change of 25 cents amounted to a semitone … and for the Resonator module it was not working at all. Fixed now.
  • Error in the naming for the displays for cents, they were called 'fine' instead of 'cents' and could thus not be found back by the program — fixed.
  • I've made patch reset on render start optional, by default it will be on. When it is on the patch will be reset when rendering starts, when it is off rendering will continue from where the patch was. Setting can be changed from the Settings Screen [F3].
  • Changed the Rotator to map an input swing from zero to one to a rotation of 2 * PI radians, this was just PI. Old patches will rotate twice as fast now.
  • Changed the Median module to have a larger maximum on the number of bins, 99 now.
  • 2014-05-17 : The terraGen module has some issues to be solved. Seems fine now after adding input clipping, have been using it in couple of patches.
  • Added info popups to more valued control types, like mute buttons and mode selectors.
  • Added mouse wheel support for knobs, this is off by default which can be changed and configured from the Settings Screen [F3]. On my laptop's mousepad two finger click drag will result into mouse wheel actions, and with that one a sensitivity of 50 seems about right. For fine control use the arrow up down keys while the mouse is still in the control.
  • Added a 'use unfocus' option that is effective only when mouse wheel support is on. When active and the mouse moves out of a mouse wheel controlled control the focus will be set to the channel one output volume control. This option is on by default.
  • Changed the default width of the panel with the main volume controls to only show channel 1. This can be changed by using the splitter to the left of it. Still … for the time being only channel 1 will be working for audioio. Also made the volume controls and device selectors for the non-working channels invisible for now and hid the unusable I/O connectors on input and output module as well. Also all the non working multi channel code was removed, this will have to be done differently once using Port Audio. The device selector was changed to allow for only one input and one output device to be selected, for multi channel operation the devices will have to support multi channel operation.
    Added experimental support for Port Audio, this needs a portaudio.dll file to be present in the application directory or somewhere on the Windows path. It will not work properly for multi channel I/O yet (i.e. ASIO). For Port Audio the buffer size needs to be set smaller than for legacy mode, large buffers may perform worse.
  • Sped up calculations a bit by getting rid of some FModulo operations, and optimizing the remaining ones with some assembly code.
  • Removed the global Scala related settings, any future Scala support will be through the Scala module.
  • Added a Scala module, which can read in a Scala scale file (.scl) and a Scala keyboard mapping (.kbm). It translates incoming note values according to the Scala files loaded into a signal suitable to control FM inputs. For this to work as intended oscillator frequenciy should be set to 440 Hz, for filters likewise.
    Sofar I've tested this only for a trivial mapping using all keys 1:1 with a 12 TET scaling. This works, but there probably are some subtleties that I missed …
    And indeed some other scales I tested give output differing from what Scala computes. Anyways …still experimental.
  • Text sequencer bug, it does not work at all, and causes a division by zero. Ah no … it wants commas, and it does not like spaces … fixed the spaces issue, the commas are needed still. And the help was wrong, it said spaces where commas were meant. It still needs a new parser … as mentioned elsewhere.

    A couple of changes on it: values can be just values or notes, a modiefie like Hz or s can be part of the value when it is numeric. Values need be separated by commas and after a value a repeat count can be set separated by a colon (:) from the value. When there is no repeat count the implicit repeat count is one. Anything not understood will be interpreted as a rest. A rest or a repeat will not trigger the gate ouput (new to).

    An example string 'A1:2, 333 Hz:3, _, C1' first A1 will be output for two clock periods, then 333 Hz for 3 clock periods, then a rest for one clock period ( extending the 333 Hz signal for yet another clock time) and finally C1 for one clock period.

    2013-11-20 : Make durations for the text sequencer, and a more forgiving parser.
    2014-11-30 : For the text sequencer add a way to play rests, that is add a gate output and some special character to indicate that a rest should be played, e.g. a note time slot is to be skipped.


  • Added atan mode to TerraGen module, to be used as a soft clipping function. I've been complaining about the TerraGen a bit in the past, but it does not seem too bad now. I did add some input clipping to it, maybe that changed things. It did not get too much thought.
  • Had forgotten to turn on the MustSave flag for the display of the Notes module, so notes were not saved. Fixed now. Also text values were not quote escaped, so when a quote was added to the text the patch would not load anymore after a save. Fixed that too.


  • Instability issue with SVF when Q = 0, fixed. In older versions set Q no lower than 0.01 (1e-2).
  • Start of rendering should first issue a reset. The sequence F9 to stop the patch, then hit reset, then start rendering does not seem to work. Will have to look into this.
    Two things, FixZippers was not called on render start, meaning knob values would be stuck low for a while when a patch had not run before render start, and Reset was not issued either, meaning rendering would start off from where it was. Fixed that.


  • Bugfix xfade module ... and the same one in Pan module - had mixed up the knob and the control input
  • Bugfix pluck module, the mute button was not working.
  • Added random distribution controls to SeqRandom module, and removed the change all input from it. Also added random distribution to RandomWalk module.
  • Added color control modulation to Noise, NoiseTrig, NoiseLFO, NoiseLFOTrig and RandSig and modules.
  • Added modulation for the alpha parameter on the Average module (untested).
  • Added a phase detector / filter module, as a building block for PLL circuits.
  • Fixed the chart mode to work for non debug/profile builds again.
  • Pluck oscillator suffered from denormals .. fixed that.
  • Added a Morse generator.
  • Bugfix for the RandomWalk module, the random distribution stuff made the code essentially non working.
  • XYScope module, this is not functioning properly yet.


  • SeqRandom, a random notes module. A scale can be set with a base note and a lowest note and a highest note. A step count can be set and on each trigger a next random note fitting the set conditions will be played. When the last step is passed the sequence will repeat from the start. A pulse on the random input will select a new set of notes for the sequence. Sequences will not be saved with the patch.
  • Made the reverb module to scale with the sample rate, it should sound better at higher sample rates now.
  • Made new images for signal polarity selectors on LFO and Envelope modules.
  • Made a multi sample and hold module, one trigger input controls multiple sample and hold units in one module.
  • Added some extra in / out pairs for the multi multiplier module.
  • PluckOsc added, a Karplus-Strong model.
  • New mixer, T1to1, a one input chainable three channel mixer.
  • Logic divider forgot to clear the ResetFlag, so after one reset it would stay in reset mode - fixed that.
  • Fixed a bug in most of the sequencers .. had 'optimized' some code, they were not working at all anymore.
  • Added a new FX tab and moved some effect modules there. Also moved the wave player module to the OSC tab.
  • Added a zero crossing based frequency detector.
  • Added a resonating filter with decay instead of Q control.
  • Added a Bode frequency shifter module. The Bode shifter shifts all frequencies by an equal amount, meaning that harmonic relations between overtones willl be changed.
  • Added a running median filter. The median of a set of values is calculated as the middle value of that set after the set was ordered small to large (only odd sized sets are supported to a maximum size of 25). On each clock a new value is added to the set and the oldest value drops out, then the median is calculated and sent to the output.
  • Changed some initialization stuff, had to modify the HrastUnit a bit for that.


  • A counter module, can count binary or sequentialy, up or down and it has a reset input too.
  • An ADConverter
  • A DAConverter
  • Fixed bug in pan module, the knob would go center to right only, not left to right.
  • Added a multmult module, where four inputs are multiplied by one common multiplier into four seperate outputs.
  • For BitCount = 1 I've changed the gate module back to it's old functionality. The boundary conditions were a bit odd with the new code.
  • Added level modulation to mixers MixM4to1 and MixS2to1.
  • Added position modulation level to Pan and XFade modules. The controls are fully open by default to be compatible with older patches.
  • Added control depth knob to formant filter. The control is fully opened by default to be compatible with older patches.
  • Made glyphs for output mode selector on some LFO and Envelope modules.
  • Made glyphs for wave shape selector on some OScillator and LFO modules.
  • Made a compressor, or actually it's an AGC more. It is feedback based in that it tries to maintain a set reference level at the output. In doing that it can both apply gain (for weak input signals, with a maximum of about 30 dB) or reduction (for strong input signals, also about 30 dB). Reaction speed can be set with an Attack control and fallback is controlled with a Release control. A pre-amp is included to be able to shift the set point easily.
  • Made a KleeBit module, which is 8 steps of a Klee sequencer. The bits can be chained to make a 16 or more steps Klee sequencer .. with some external glue.
  • Added a 3dB/octave (10db/decade) pink filter, to pinken up white noise.


  • Instability issue in Flanger/Chorus module solved.
  • Output types for all LFOs: 'Normal', 'Inverted', 'Positive Only', 'Negative Only', 'Positive Only Inverted' and 'Negative Only Inverted'.
  • Activity light on NoiseLfo was not working.
  • Output types for AHD and ADSR envelopes: 'Normal', 'Inverted', 'Normal Negative' and 'Inverted Negative'.
  • Looks like the knob popups can be hanging at times ... made a breakout for it F8 will work.
  • Colored border on modules, user selectable.
  • Slow fall off on the display module (VU meter) .. instead of drop to zero immediately ... which sorta worked with the old lights update regime but not at all with the current one.
  • Finally found a nice compact form for an Euclidean rhythm generator (a variation on Bresenham's line drawing algorithm, read more about that here), and turned that into a new module. [On the sequencer tab, 1205]
  • Added a fast mode to the display module to have the meters react faster. This sometimes better fits the data to be displayed.
  • Added a CSV data module, it can read a Comma Separated Values file with up to 11 columns of data. The data is being clocked out with a trigger input, it can play forwards or backwards and there is a reset input. There is an option for playing the file data once or looped. When the mode is set to once the data sequence will start again after a reset signal on the reset input (or the global reset button being clicked on). Comments in the CSV file start with a # character, when a comment is on a non-data line it is ignored when the file is read, when it is at the end of a data line it will be displayed in the module for that step in the sequence. [On the sequencer tab, 1206]
  • Added digitizing to the logic modules, they used to convert the input into a single bit value (which is still an option) but they can now digitize to longer bit vectors as well. The logic function is then executed on the vectors instead of the single input value. Also changed the XOR and XNOR functions to perform odd and even parity respectively. Added two new functions ONE and NONE that behave like the old XOR and XNOR functions did, the output going active / inactive respectively when precisely one input is active. The bit vector stuff will not work on these two new functions.


  • 2014-04-08 : Floating point overflows in places ... some input clipping is needed, but not sure why signals get so large in the first place.
    Okay .. it was SVF instability ... probably fixed now.
  • There was still debug info present in the release build, removed that, shrinking the exe size quite a bit.
  • Changed the way rendering works .. it does not generate live audio anymore. The thread's priority level is set to 'idle' so it wont hog a complete CPU. A limit can be set for the maximum recording duration, or it can be set to zero (or blank, or any string value that can not be translated into a float value) to make it record till the file reaches a size of 2GB. At any time the rendering can be stopped which will close the file. Likewise, leaving the program will close the file too .. or when an exception was raised .. the file may be shorter then than expected.


  • Set all floating point exceptions to be masked for release version. Also clearing any exceptions after Tick executed (so errors wont propagate).
  • Added a property selector utility to set the value for the ControlType property on knobs more easily. This is a module design time feature only, it changes nothing for the synth itself ... although ... for some odd reason this halved the size of the executble tho o_O .. for the curious, it's in the knobs2013.pas unit.
  • There seem to be some numerical instability issues in one or more of the modules ... the program crashed on me last night. This may have to do with FPU exception masking and how windows deals with those, when the masking is set different from the windows masking even something simple like Abs( reasonable_value) my trigger a floating point exception.
  • Added sum output for scaler module, it gets the sum of the other four outputs.
  • Made 'inverted' output for envelop module, this one get the difference between the peak value of the normal output and the current value of the normal output. The idea being that with this output it is easy to make something get louder when something else gets softer. Using the peak value will prevent the inverted ouput from going negative, but it will take some time to settle. Also added a peak decay option on this with selectable time.
  • 2014-06-02 : Render to file option. Rolled my own RIFF writer for this .. may do a RIFF reader too now .. it seems not too hard ... anyway, did some tests and the WAV played in VLC, WMP and CoolEdit here, so guess they are fine ... no file length checks tho ... so be careful when it goes over 2 or 4 GB, the code could do 4 I think.
  • Had to split the knobs2013 componenents into a runtime and a designtime package. Turns out that in order to be able to make design time property editors on has to specify an extra compiler option -LUDesignIDE (or elese Delphi will not find it's design interface ... ), but this causes the program to be linked with runtime packages ... which then in turn causes users to complain ... Anyways, when you want to compile your own you need to uninstall the knobs2013 knobspackage and then install the new Knobs2013Design package. Also added a couple of missing icons to the DCR file. This explains the file size halving too.


  • Made popup menu's for selectors, so you can now right click on say an Lfo speed selector or a mute button to select a value directly instead of clicking to cycle through the values. Selectors currently are indicated by a yellow border.
  • Working to port over a FlangeChures and a PitchChanger I had laying around since the Turbo Pascal days .. or was that Borland Pascal ... old anyway .. from the days one could directly make interrupt code in Pascal. There seem to be some overflow issues to be sorted out. Some issues still with negative rates for the frequency shifter.
  • Removed profiling code for releases, this makes the program run a bit faster.
  • Fixed hint / popup window for knobs to keep displaying when the value is changed with the mouse. F8 will show all knob popups .. not too useful actually.
  • After patch recompile dezippers are set to the final value immediately now to stop the slow glide-in that happened.


  • Changed the module designer a bit, such that the module's PageName property will be automatic if the module happens to be on a TTabSheet with a non-empty Caption.
  • Changing some signals for AHD and ADSR modules to control rate to make them more efficient.
  • Changed the trigger lights on AHD and ADSR modules, they are on now when the envelope is in some active state, i.e. they now indicate envelope activity and no longer the presence of a trigger signal. This works better for very short trigger pulses taht would not be visible otherwise.
  • Removed the denormalized exceptions from the floating point exception mask to be able to find cases of denormalized numbers. As a result of that I've added Normalize() calls in a couple of places (Including the HrastUnit).

    This code will only be active in debug compiles of the program, to help find execution speed issues.

    All of this seems to have sped things up a bit.
  • Made update rate for lights user settable (settings page - press F3).



  • Interpolating random signal generator. Moving from current value to random value at a rate determined from the frequency it runs at - smoothly.
  • Mute was working the wrong way around on Noise and TrigNoise modules. And for LFOs dito.
  • Made a built in rectifier for the intdif dif output, so it can be used for trigger on signal change operations more easily.
  • Square thingies not working unless PWM modulation is being opened up - fixed.
  • Envelopes still act strange ... seems better now, removed some code


  • 2014-05-01 : HrastOsc vintage knob must not be in the knob map - fixed that.
  • User selectable sample rate: 44k1, 48k, 88k2 or 96k. Also changed the control rate from being 'sample rate' / 4 to 'sample rate' / 8.
  • Moved intdif module from control page to filter page and changed it's type ID from 312 to 1003. When an old patch will not load anymore please change the type ID for all intdif modules (type = 312) to 1003 - this can be done with any text editor (like notepad).
  • Removed lights handling from audio loop and made it timer driven instead.
  • Removed some synchronization code that did nothing.
  • Some more LFO range issues fixed, forgot range for SquareLfoTrig.
  • Added Lin range for LFOs, the FM will work linear then too. For trig LFOs this means that they may never finish their sequence.
  • 2014-04-30 : AHD envelope has clicks it should not have. Had A and D shapes reversed, looks like a click on the attack phase is more acceptable than one at the end of the D phase. This may need a bit more work later.
  • Added exception handlers for synth engine crashes. This will stop audio processsing and issues a message about that .. instead of the usual four ...


  • Fixed square LFO speed range selection, I had a typo.
  • Made the quantizer working again, also it displays note fractions now instead of arbitrary numbers. To do that I moved the rationals source module from the project itself to the knobs2013 package.
  • Fixed LFO out lights, another typo.


  • Major overhaul in how knobs are handled internally. The patch version has to be changed as a result, and current patches will not be compatible with this.
  • Made a popup menu for connectors - this sort of works .. break is not quite what I'd like yet - it should break the downstream connections, but currently also breaks the upstream one. Delete deletes the whole connection tree where the connector is on. Disconnect removes this one connector from the tree.
  • Made a module popup menu too, with cut copy and delete options.
  • Made a knob popup menu as well, added default values for knobs and the default can be set from the popup. Knobs can be locked and unlocked from the popup too. When an editable display is associated with a knob editing the value through the display will lock the kob to prevent the edited value to be changed by knob movements. The lock can be undone by unlocking the knob or by setting it to it's default value.
  • For 'File Save As ...' cut out the path in the save dialog to only show the file name there.
  • Changed the connector coloring a tad.
  • Had messed up oscillator frequency calculations, they were two octaves too low, fixed now.
  • 2014-03-03 : It happens on module insertions that the lights will not be updated (properly) anymore. It can also happen that a knob on a module controls something on another module. So it looks like the patch compiler has some issues. This seems fixed now.
  • 2014-03-28 : When an envelope of type AHD or ADSR is in fast mode and the patch is then saved the values will not always be properly set after reloading the patch. The same thing happens when such a module is copied and pasted. This seems fixed now.
  • 2014-04-01 : There is an issue with Knobs and setting values ... like an oscillator frequency by default is 440.00 Hz but after some messing with the mouse on that knob it is impossible to get that value set again. Only way to get it back is to drag the knob all the way to one of it's ends, then use the cursor up/down keys to try to get past that end, then use the cursor keys to step all th way back to the value ... yuck. This seems fixed now.
  • Defaults, stepcounts and ranges for several modules were changed.
  • Sequencer chaining would crash things on a floating point overflow, fixed.
  • Adding lookup tables, my earlier conclusion that they were faster only marginally was wrong. This will limit modulations to foreseen ranges though, and some value clipping will be needed. See previous point tho .. this would be needed anyway.
  • Cleaning up code, there are duplicates all over the place and bits of unused code too.
  • Adding speed ranges for LFOs, Slow, Medium, Fast and BPM.
  • Selectable waveforms for LFOs and oscillators to reduce the amount of modules a bit. Sine, Saw, Tri and Square.
  • Changed peak level indication for main in and output displays to slowly fall off, also added clip indication with a highlight color on those.
  • Reversed knob direction for Average filter. So now the cutoff frequency get higher when the knob is turned right, like how a filter works.
  • Removed the logic gates And .. XNor and replaced those by one Gate module with a selectable logic function. The same functions are available still.
  • Removed variable input count stuff, it had been disabled anyway.
  • Fixed bug in rectifier module, full wave mode did not work.
  • removed linear LFO and OSC stuff .. need to rethink that.
  • Repeats on the up / down knobs under knobs work just once and then never again. Ah .. forgot MouseDown := False in MouseUp handler, that fixed it.
  • Added HrastSVF 12 / 24 dB resonating filter.
  • Added cents control to HrastOsc
  • Frequency fine control for oscillators added, in cents. Range -50 to +50.
  • Added dB / Linear control selection to mixers, changed some attenuaters to dB mode here and there, added some level controls here and there. Renamed some stuff now that the patch versions are incompatible anyway.
  • De-zippering added for knobs on modules, inputs to be de-zippered can be added to a knobmap (at compile time) and the process will then be automatic.
    This will not work on mute buttons that use the SignalToLogic function to decide what to do, best to use SignalToMute( FInCache[ x]) * OutLevel or somthing alike instead of an if then else thingie.
  • Added exponential FM control for wave player. To use this the speed input must be connected to a signal source unequal to zero.
    Could have made the speed input to default to 1 to solve this , but then the position input would need the speed input to be set to zero ... compiled patches ideally would know if an input is connected to solve this issue.
  • Added color to random walk module
  • Added attenuators to square LFO and OSC modulation inputs.
  • Added time modulation for AHD and ADSR envelopes.
  • Fixed bug in AR and ARretrig envelopes that became visible after adding the dezipper code, it would try to dividde by zero.
  • Fixed bug in triggered LFO and OSC modules, they did not stop running always.
  • 2014-04-02 : Module paste can still mess up the module layout, and also can get modules at negative offsets still it seems.
    Looks like I finally nailed the the problem where the module lights stop working after a new module got inserted, or rather it would stop after a module was moved in the editor ... this was partly treated as a patch change and partly as a no change, resulting in the editor modules to be renamed and the patch not being recompiled - I've deleted the editor name changing line.
  • Repeats on the up / down knobs under knobs work just once and then never again. Ah .. forgot MouseDown := False in MouseUp handler, that fixed it.
  • 2014-04-01 : Unit interpretation in displays for knobs is not correct.
    I think this is not relevant anymore.
  • Fixed some graphics stuff that got broken over the months.


  • Window state saved in ini file, when the window was maximized on exit it will be set maximized again when the program is restarted. Minimized state is forgotten though.
  • Added a reset button which resets some module state on click, there are likely issues with this as reset is not as trivial as it may sound.
  • Added mutes per input on MixM4to1 and MixS2to1 modules.
  • Solved issues with output module, it does not need to be connected anymore and there can be as many as you like. The AudioOut module now gets compiled as any other module, removing the need for special stuff in the main program. TAudioOut is now treated as special in the synth engine itself. All inputs from aydio outs will be added there and the result is then copied over to the output terminals of the synth patch. The output mapping stuffthat was used is no longer needed.
  • Solved issues with input module, it does not need to be connected anymore and there can be as many as you like. The AudioIn module now gets compiled as any other module, removing the need for special handling in the main program. It is now treated as special in the synth engine itself where values from the engine's input queue are copied over to the outputs of all the AudioIn modules present in the patch. The input mapping stuff that was used is no longer needed.
  • Solved issues with knob default values of zero to not be used.
  • HrastProgrammer contributed a HrastOsc bandlimited oscillator module, thanks Hrast!
    I Changed the module layout a bit for this one to make it fit better into the scheme, and also added a little code to it to make sure that disconnected cables on control inputs will be reset to zero.
  • Fixed the situation where knob values zero could not be a default, changed some default settings for some modules.
  • Added the program icon to the source tree.
  • Fixed the project's DPR file, Delphi had put some crap in it.


  • A little speed up for filters and oscillators, changed some signals to control rate. FM stuff may sound a bit different now, however I did not change the linear OSCs.
  • A patch changed warning on program exit. This is on by default but can be turned off in the settings screen.
  • Added a debug indication in the title bar for the debug version. A debug compile is less efficient and should not be released by me, but I might do so by accident.


  • Removed dependency on TLed component. New Source code (2014.3.29.0, build 57) published.


  • Stereo wave players. Wave players still need to be 44k1 samples/second 16 bit wav files, but now both mono and stereo files can be loaded. For a mono file the L and R outputs will have the same signal, for a stereo wave the mode can be set to stereo or mono. When set to mono L and R will both have the sum (divided by 2) of the left and right channels from the wave. In stereo mode the L output will have the wave's left samples and the R output will have the wave's right samples. Added an indicator to show wheter the wave itself is stereo or mono.
  • Chainable 6x6 mono matrix mixer module.
  • Source code for 2014.3.28.0 (build 56) is made public, see the Downloads section. The customif components have changed, so they will need to be recompiled too (before recompiling the new application).
  • Search shortcut changed to CTRL+F


  • Bugfix - some patches could not be read, and sometimes modules could not be copied because the patch reader would not accept values in scientific notation (like 1E-12).


  • Search function on module title, highlights found modules, F7 shortcut.
  • Support for netMIDI / tangle, MIDI over TCP.
    This got implemented by using the Overbyte ICS TWSocket component. When you want to compile WREN yourself you will need to install that component. It can be downloaded from here, look for ICS.
    A zipped up netMIDI executable is available for download from here - see the Downloads section (netmidi.zip). Will make source code available at some later stage - it is old Delphi code and it needs to be ported to Delphi XE5 first. The old code is available on request though.
    Note that MidiTangle can probably be used as well http://jcfmusic.com/miditangle.htm
  • Rectifier module, MinMax module, Integrator/Differentiator module, MIDI note receiver module, MIDI CC receiver module, MIDI note transmitter module, MIDI CC transmitter module.


  • Horizontal and vertical knob change modes, in addition to the circular one used now. Built in a treshold for movements as well, such that after the click a minimum distance has to be moved with the mouse before the value will change.

    Ok .. it sorta works .. except for knobs near the edge of the screen ... would have to make the mouse cursor invisible .. jump to screen center then handle the moves, then jump back to start location and make the pointer visible again .. that is for later.

    Hit F3 to go to the settings.


  • Made a 2D vector rotator.
  • Made a ready output on the triggered LFOs, and a sync output on the other LFOs.
  • Made a file open dialog on the wave player and now display only the file name and not the full path anymore. Old patches will still load OK.
  • Added control knobs to xfade and pan modules.
  • Added sequencer step outputs that go active when the step is active.
  • Added sequencer chain input.
  • Added some mixers, 4 to 1 chainable mono and 2 to 1 chainable stereo.
  • Fixed the problem where loading a new wave player into a running patch would crash the synth.


  • Made oscillators and LFOs with linear frequency control - not quite happy with those yet.
  • Ratio control module to multiply a signal by some ratio, like by 5/8 for example.
  • Added D and RS flip flop types.


  • Combined WavePlayer and WaveStorage modules into a new WavePlayer module that both has speed and position control. When a patch with a WaveStorage module is loaded it will be replaced by a WavePlayer module.
  • Added duration ranges (speed) to AHD and ADSR envelope modules.
  • Logo and some looks changed.
  • Help system changed so that it talks about the modules as they appear in a patch rather than as how they are seen by the synth execution engine. The help text for the modules is now set from the module designer rather than from code.
  • When F1 is pressed and a module is selected in the patch editor the help will try to directly move to the help for that module.
  • Added images to the hint / tooltip windows popping up from the module selector.


  • Some scrolling / panning issues .. it still sucks, but less so.
  • VU meter looks changed.


  • 2013-11-23 : Look at notes / octave setting and the 440 Hz reference setting, does it really have to affect LFOs too?
    No ... made LFOs independent of that mechanism and based on 12 notes / oct and a reference A of 440 Hz.
  • A wave player with variable speed playback and made a wave storage unit too, that one has a position input meant to be controlled from a sawtooth wave. The storage module seems more flexible, as it is easier to set begin and end points on the wave by constraining the saw amplitude and offset, and also by FM modulating the saw there is a form of pitch control. When the saw is inverted it can still play the wave backwards.
  • Changed the looks a bit again, new knobs mainly, shifted around knobs, texts and connectors here and there, fill color for envelope graphs added, clearer connectors.


  • Fixed the issue with moving selected modules being way too slow. However when a bunch of modules are dragged too high up module restacking may change the order of some modules still.
  • 2013-11-21 : in TConnector.MouseMove make the wire panel scroll when the mouse goes out of its visible area, but do not scroll beyond the current size (as defined by its module content).
    2013-11-22 : Autoscroll needed for when modules get dragged out of view and when wires are dragged out of view. Ths scrollbox should keep the point where the mouse is in view in those cases.
    Implemented "follow mouse" for cable drawing and module placement such that when the patch editor has scroll bars it is still possible to patch with it.
  • Semi fixed the arrow icons on the 'noknobs' (as used for instance for note slection on sequencers). This will need a better soluition at some stage.
  • Started implementing mousewheel messages to perform scrolling. Vertical scrolling works OK now, horizontal not quite yet.


  • Fixed crashing popup editors.


  • Ported application from Delphi 2009 to Delphi XE5.
  • Fixed delay control knobs


  • 2013-12-17 : S&H bug, it acts like T&H. Fixed now.


  • Made the lights update a factor two slower, gives room for about 10% more modules it is a bit more sluggish now tho, light wise. was about 86 ms, now about 12 ms or just a tad slower than 6 Hz.


  • 2013-12-16 : Locale issue - patches saved in a locale that uses a comma for the decimal point will save patches with that comma, but on read back the program insists on a dot. Ah .. and that went wrong on internal representations too. Looks like fixed ... global locale settings needed to be set OK. Reported as fixed too now. too.


  • Added focus visibilty and keyboard arrow handling for TKnobsValuedButton(s)
  • Sped up sine oscs by 25% or so.
  • Made the bar indicators display dB's instead of arbitraty units, the Display module also works now.
  • Got rid of the TKnobsValuedButton)s), made a new TKnobsSelector component which is smaller and looks better.
  • Added mute buttons to a lot of modules, about 30 in total, tested most of 'm. The envelopes have a three mode mute function, it can set the envelopes to pass through the signal evenwhen no trigger comes in ( pass mode, the other two modes being unmuted and muted).
  • Profiler gives some more detail, like wire performance and overhead. The lights on the modules are nice, but it seems to be like 25% overhead comes from them.
  • Changed some colors.
  • Streamlined text to value conversions, so they work the same everywhere now. It also accept both note notation styles A#4 and A4# now, and even A#4# .. oh well.


  • Lil fuckup with text sequencer and optimization of initialization code - it crashed the text sequencer with a division by zero ... anyway, fixed now. It needs a small modification to the TKnobsDisplay component .. didn't reflect that in the published source code yet.


  • Fixed tab order on modules and added tab stops on some controller widgets that didn't have it yet.
  • Made all value displays editable (so values can be set with better resolution than is possible with the knobs). It should also be possible this way to enter different modifiers from the default one's - like use note names for an oscillator.
  • Value displays can be 'tabbed to' as well now.
  • A new way added to open an editor window - tab to the value display or click on it and then hit enter.
  • Several small optimizations in the drawing routines, and less unnecessary screen and synth updates.
  • 'Move final' behaviour on knobs changed - this mostly affects the delay lines where new memory will only be allocated when the total time had not been changed in the last 739 ms.
  • Added offset parameters for the editor, so modules can have a fixed small border on the left and top, making it easier to select modules near the left or top.
  • Changed contact details in the about box, and in this file, to point people to the electro-music forum.
  • Added a RandomWalk module - or brownian noise as some also call it. In this one a virtual particle performs a random walk in a confined D space, when it hits a wall it'll bounce off. X, Y and Z outputs are available as outputs.
  • Made the lock mechanism on the scaler modules work, in lock and antilock modes the knobs movements are synchronized. This way it is easier to to scale a value and offset tit at the same time. See it as a modulation depth control.
  • Some visual details changed, like LEDs a bit bigger, symbols on modules lined up better
  • Envelope shapes in documentation are better now, some preset display types added for the TKnobsDataViewer component. Mainly a 'design time' item.
  • 2013-11-23 : DEL key not always working for module deletion, and then ctrl+DEL does not seem to work either. As if the patch thinks deletions are not possible. This seems fixed now.
  • 2013-11-19 : Get knob changes into undo history. Did it.
  • 2013-11-19 : Compile less often. Did that too.
  • 2013-11-18 : on edits of the text in the text sequencer the synth is reported crashable, prolly related to the one below. Sofar I've not been able to reproduce this on various 7, Vista and XP machines. Unreproducible.
  • 2013-11-18 : someone reported an OSC module disappearing - leaving some wires to go nowhere, prolly related to the one above. Sofar I;ve not been able to reproduce this on various 7, Vista and XP machines. Unreproducible.
  • 2013-11-18 : there is a bit much latency from input to output. Maybe start using directx instead of legacy audio., such would prolly improve device name displaying as well in the audio device selector. DirectX will not solve this for Vista or later ... maybe look at ASIO later, or the underlying mechanism used by ASIO.


  • There was a problem when pasting multiple modules with the mouse capture keeping stuck on all but one module, fixed this.


  • Some new modules, some bug fixes, renamed all controls, old patches will not load anymore (but forgot to change the patch version). Old patches can be fixed in a text editor BTW.


  • Ran into some float denormalization issues making some patches about 15 times as slow as needed. Added undenormalization on many outputs and also reconsidered the antirunaway code a bit. This now prevents absolute signal levels from both getting too high and too low (too close to zero). erm .. this could be formulated better ... the anti runaway code now also prevents float denormalization to ripple through.
  • Added some profiling code, so that one can see now how many processor clocks are needed for the tick and slowtick module methods. Run a patch for a while, then hit the profile button. This will make a file profile.html in a data subfolder of the application folder. So one can see the computational bottlenecks.


  • The keyboard shortcuts got some more attention, seems ok now.
  • Added a fixed delay output on delay modules - this one gives the maximum delay as set by the delay knob, it is not modulated.
  • Changed the output name for Avreage filter to LP and added an HP out. Also changed knob response for this module to give better resolution at the high end.


  • 2013-11-25 : New envelopes have clicks that don't belong there, ah no .. it's a gain issue ... the published version has non working gain, and on trying to fix that I got the clicks. So ... gain on the new envelopes does not work.
    Fixed now, gain works, no clicks.


  • Added two new envelope modules, AHD and ADSR with them nice envelope displays that respond to the knobs :-0


  • 2013-11-23 : Divider indicator not working, and some more. Fixed various little issues for this release, enough to be able to actually do my first noodle with it :-)
  • Source code for 2013.11.23.3 is made public, see the Downloads section. The customif components have changed, so they will need to be recompiled too (and before recompiling the new application).


  • 2013-11-23 : LFOs run a factor 2 too slow. Fixed.
  • 2013-11-23 : Look at filter tuning, needs rescaling like the OSCs had it and it seemed off before. Filter tuning did not work at all, fixed now and tuning seems to be about right.
  • Changed the Looks a bit
  • Display editors can handle ENTER now inside text, use CTRL+ENTER to close a display editor.


  • Had forgotten to convert the trigger OSC and LFO stuff for expo control. Also trigger lights on those modules did not work. also had forgotten the SVF.


  • 2013-11-18 : Exponential frequency control. That, and rescaling of knobs for frequency control on oscillators and LFOs. Also removed the quantizing to knob steps, so that once editors are available for values all arbitrary values could be set (within the resolution of an IEEE double float).
  • Implemeted a setting for notes / octave, not sure how useful that is as it is.


  • Various changes in the user interface, added an about page, recent file history, patch name editor, added some keyboard shortcuts (F2 will show the editor, F3 the settings).


  • Name changed from 'modules' into 'WREN'.


  • 2013-11-21 : When a new version runs and F1 is pressed the help files should be regenerated - did it.
  • 2013-11-20 : it was reported that when scrollbars appear displaying the visible area starts to behave odd, sofar I've not been able to reproduce this on various 7, Vista and XP machines. Ok, I see what was meant now, working on it. Seems fixed.


  • 2013-11-18 : SVF seems to lock up for (very?) high or low FM values. Added clipping for the sum of frequency and fm to a range 0, 1.
  • 2013-11-18 : Feedback delay loop seems to lock up under positive feedback conditions. Added cliping to range -16, 16 to input.


  • 2013-11-20 : trig lights on AR modules not working, the names are wrong - changed the names.
  • 2013-11-20 : Note number to signal and signal to note number do not work correctly for 'negative' octaves - (i.e. A-1) this needs a mathematical modulo calculation and floored division to make it work correctly. Introduced two new functions Remainder and FlooredDiv to perform modulo and division for this case.
  • 2013-11-20 : Make a logic NOT module - did it.


  • 2013-11-18 : Pressing DEL in an editor :: Changed the DEL behavior a bit, removed it as a menu shortcut and instead let the application handle it. the application will first ask the editor if modules can be deleted, and if so it will do that and mark the key as being handled (so it will not be passed on to anything else). When the editor is not in a state where it can delete modules the key will not be handled by the application and be passed on to the control that has keyboard focus (i.e. a LabelEditor (for module labels) or a DisplayEditor (for the notes editor in the TextSequencer). This way the DEL key can still be used for both functions, delete modules when possible and delete text from an editor otherwise.
    For another way to solve this see http://embarcadero.newsgroups.archived.at/public.delphi.vcl.components.using/201009/1009246070.html


  • 2013-11-18 : pressing DEL in text sequencer editor will delete the module while the editor is still open, crashy stuff from that
    'Solved' with a bit of a kludge - module deletion is not possible when there is an editor open - either on a text sequencer or on a module title (which has the same issue).
  • 2013-11-19 : The resource files customif.dcr and bitmaps.res are missing in the source zip - made them seperate downloads for now, they go into the customif project folder.


  • 2013-11-19 : Get some unused stuff out - diddit.
  • 2013-11-19 : Show input buffer over and under flows in debug screen - diddit.
  • 2013-11-19 : Fix error with quotes on version number - diddit.


  • 2013-11-19 : Make version numbers visible in the program - on the settings page.


  • 2013-11-18 : A shorter delay - made it.
  • 2013-11-19 : Random picks from text sequencer, as a random lookup table - added a robsol mode.
  • 2013-11-19 : Introduce patch versioning, the proposed change from lin to exp frequency control will make patches incompatible - current patch version is 1.
  • 2013-11-19 : Globals.pas in the customif stuff should be renamed, two times the same filename is troublesome (there is a globals.pas in the main project too) - it is glowballs.pas now.


  • 2013-11-18 : color on SVF filter outs is wrong - blue instead of red - changed that
  • 2013-11-18 : audio in does not work - it works, but the level display is wrong - changed that
  • 2013-11-18 : audio in does not work, the input values are garbage, this needed buffering - added buffering