Hi I like B and C most and suggest D! I read, that you dont like to build new hardware for the V3. So what do you think about this: D: Why not integrate a small "Keyboard" on the left. Just need a button which gives these A,B,C,1,2,3,4,Edit,Mute,Solo... a second function. So you can edit notes by pressing first the note button eg a C and then the step button eg 16 - maybe sometimes this is faster and more intuitive than using the inc/dec. (like a matrix-princip) If you got your hardware ready you can integrate it and if you build a new one you can do it like you see in the picture and what about add a midi-in for a keyboard to play chords - than you can press the cord and then press the step button? Im not shure whether explaine my self clear. so feel free to ask ;-)