some discussion here.
I’m not aware of too much development but I’m pretty sure there is a prototype out there somewhere!
It relies on A/D & D/A modules and is definitely part of official rig.
IT probably got a little eclipsed with all the recent brew ha ha over coronavirus etc and the step sequencer also became an obsession for a while.
How it’s all integrated into the system is frequently down to experimenters, it wasn’t so long ago that we were adding extra in ports for switches and now we have that as part of the v4 kit, so now is probably a good time to describe how you would like it to function.
Certainly I’m after volume pedal functionality at the very least and probably much more besides.
Hope this helps.