Nick, I´ve been thinking: SubCounterC = 16.3516 Hz and (hope the words are reasonably correct) SevenAccented C = 16744.0362 Hz These are about the limits to what normal people can hear (let´s just forget that few people in here are normal . . .) So, the range possible to hear is about 10 octaves, and YOU have already mastered 6 of them! Can we expect a sub-to-super-sonic videoclip in the near future!?