Jokeyman123, Thank you for your response. As previously mentioned, this does not occur for all tones, only certain ones. I assume that a general transposition issue would occur for all tones. To be more specific on the problem, if I play a C chord with the left hand with accompaniment, the corresponding chord with the right hand is G. If I remove the accompaniment, the C chord with the left hand matches the C chord with the right hand. I would really appreciate any help on this, otherwise, I will be forced to return the unit. Thank you.