I love this idea and was thinking of something similar. The idea would be that you could go into an Edit Scale mode, and while holding the key you want to tune you would adjust the pitch by turning a knob, maybe the rate knob? Ideally I'd like one mode where you retune just the notes you plan to play and then when using this mode to playback those are the only keys that sound plus all the octaves of those notes of course. A second mode that I think would be super handy would be to retune just one "scene" when the octave is not up or down, you could go note by note and tune to any scale you want and even octaves up and down the full range. This would make it easy to play live a wider range of notes. If it were possible to use the rate knob for editing one press could take you from course adjustment to fine tune. Course would just go up by semitones and fine by a finer degree.
