FWIW, and I don't know how this works, but I'm happy in the keys of C, D, E, F, G, and A. Okay, all bar one of them contains #'s and b's, so I'm playing other than all white keys. However, if someone calls for a tune in C#, Eb, F#, Bb, or even B, I'm diving for the transpose button. I ain't above that.