I used to play PA, many years ago, but always was curious about chromatic instruments. I want to learn C system just for my own enjoyment. I see chromatic instruments with all treble buttons white, and others with black&white ones and i was wondering if the first is more difficult to learn than the second. i assume that with black and white keys its possible to find notes easier but i really don't have a clue. it is particularly harder to learn on an instrument with all treble buttons of the same color? Thanks!