Introduce virtual expression pedals 3 and 4, controlled by CC

[DiffractionCircuit]

I think this is the same request…

Add "virtual" (MIDI only) expression pedals

I think it would be quite useful to have additional expression pedals (EXP 3/4 for example) defined as MIDI only devices. This would allow capabilities like: Allow the physical EXP ports to be used purely for additional stomp functionality (until we get direct MIDI block control) while still having expression pedal control available Allow for MIDI waveform generators to be used like an LFO for block params while still allowing EXP1/2 to be used normally/without conflict More overall bypass an…