… If not, can it be setup with an expression pedal connected to a midi controller (MC6 Pro)? ….
It’s possible to use a CC Toe Down (or CC Heel Down) Message Type on the MC6 Pro to trigger (P) (A) (B) Active / Bypass (M). Wherever you want your ‘off’ position to be, send a CC value less than 64.
… Let us know if there are any other algorithms you’d this this would be useful for…
Hmmm … how much time have you got? First thought was for a ramping slow gear-ish / SuperEgo-like algorithm for swells (which doesn’t exist as yet). Then again, there is TremoloPan, and those lovely synth offerings …