Mysha, I don't know. But I would tell you each persons disabilities need to be assessed. They will always be the same but different. I would take your question to a Physical (Physio) Therapist and get their take.. I know of an accordion player that uses a button box but only the left hand. Since he was learning it new it made no difference to him that he played it upside down. Concertina would be a different story I am sure. Don
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