One thing that would be great, is to have SCALE function.
An on/off switch would activate Scale function, starting always on stage #1
, and based on the ROOT note of stage # 1.
If you choose for example "Mixolidian_b6" scale, only notes that are in that scale would be active/sound...
I realize that it (Scales) might be a very complex thing, but you did it in Klee, and M-185 being a mono instrument,... well, I am hoping for the best:)