(Mine is Kratt, MK2-C). I think Bo is off by one, 13 in all, C through C in semitones. What I'm stumped on is that C#=Db, D#=Eb, F#=Gb, G#=Ab, and A#=Bb. What are these notes on a 'chromatic' scale? I thought these equalities only existed on an equal tempered scale. [C chromatic =264 Hz, C equal tempered =261.625+ Hz, both referenced to A = 440 Hz.]