Some small changes to EnvReso

Published as pre-release. 2022.1.29.0]

I’ve made the trig input behave a little different. When left unconnected the module now doubles as a very low frequency filter. The input in that case is taken from the gain input. For the rest the module behaves the same as before.

When trig is unconnected and a regular envelope is connected to the gain input resonance can be added to that regular envelope signal.

And now I may want to add the filter’s bandpass and higpass signals as well for an output - but running out of pixels a bit :)

Then I updated the module help to show all functionality.