There are only 21 possibilities for 12 notes, which I would assume get translated into a number anyway, so it's not like there are hundreds of possibilities. So maybe something like:

01: C = B#
02: C# = Db
03: D
04: D# = Eb
05: E = Fb
06: F = E#
07: F# = Gb
08: G
09: G# = Ab
10: A
11: A# = Bb
12: B = Cb

And since you have to actually type in the chords, it seems to me that if I explicitly type in "Amaj7/Eb", that's what should be displayed and in the background, I imagine the Eb gets interpreted as a number (which is the same number had I entered D#), and then it just processes the chord sound based on that. If it doesn't recognize what I type, that's a different story, but the fact that I can enter AMaj7/Eb and it converts the display to Amaj7/D# tells me it fully understood what I entered, so it ought to be able to display that both in the chord grid and on notation printouts.

John

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