I spent some time yesterday with the A4 and an instance of Arturia’s Mini V hooked up to an oscilloscope and freq analyzer trying to nail the oscillators and made a Kit I might share later once I have it better tested. I should do a sound demo as well – it gets me most of the way there to a Minimoog sound, although not exactly phase-canceling identical.
It’s effectively a monosynth like this – tracks 1-3 correspond to a Mini oscillator, and I use unison mode for triggering all three and the CV. CV A and B are hooked to the 251’s mixer to give keyscaling and base cutoff, with the CV envelope providing the contour. Resonance can also be plugged into CV C, which frees up D for whatever.
The MS-20 isn’t providing sound but I use its keyboard to play the A4 (you can’t use the A4’s buttons because you can’t trigger the CV envelope with the other tracks as far as I know)
At this point I have the performance controls set to do filter and amp envelope duties, and might make a couple other kits as well to swap out resonance for other duties like glide or vibrato.