I am still not clear. I have 12 button rows (6 deep) on my accordion, giving me the keys of ABCDEFG, plus Bb, Eb, Ab, Db, Gb (which you can turn into the sharp equivalents, A#, D#, G#,C#, F#, What more do you need? I mean you have to work at it, but we are talking the accordion here, which is work squared.

yours, Peter T.