Hi, I am not a keyboard player but have purchased an early CX-3 (only one set of drawbars) for our set to give some authentic 70's sounds (green onions and the like). There appears to be a pitch shift between octave so that you can use the pitch contol to say tune middle C to another keyboard, but then the C's in the upper octaves are out of tune. The master oscillators cannot be at fault, so why the discrepancy between octaves? Many thanks in advance for anyone who mails back. John