New technology needs new design. The starting point was just placing four finger comfortably on the screen. That is the layout for the major chords. Surrounding that are all the supporting keys and chords like the minor, 5th, 6th, 7th and sustained.

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Notes
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C Layout
0 Sharps
Highlighted gold keys are playing C Major
The triangular Octave indecator shows the lower C is C4 and the upper C is C5