Some thoughts on a touchscreen piano-like keyboard (although there are already many apps).
Separate the commonly used notes from the accidentals. There are presets for all the major and minor keys, modes, blues scales, but programmable as well (even measurable for a song).
Lay out the keyboard to make keys as large and square as possible. Boustrophedonic linear.
Scroll by 4ths (down) and 5ths (up) and (maybe) octaves only.
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