George,
I would like to know the answer to that too! I had zero luck with CMC getting a defective SD2 unit replaced and decided with the kind of support I got from CMC I would never purchase another Ketron product - especially an expensive keyboard. If this changed I might change my mind. By the way, nearly a year after I just gave on up on CMC AJ stepped in and sent me a new SD2 Unit.

Deane