Check out the links below. A bit of a ‘changing harmony’ mashup of MIDI control, aux switch to expression pedal mapping, direct parameter control via switch, and some HotSwitch references:
https://www.eventideaudio.com/comment/31094#comment-31094
https://www.eventideaudio.com/comment/27713#comment-27713
https://www.eventideaudio.com/comment/28364#comment-28364
