i posted in the Korg forum as well, but since there's more traffic here, i'm posting here as well. please accept my apology for the cross-post, but i need to get this figured out as quickly as possible.
i'm looking for instructions on how to reset or reinitialize our Poly 61, and to ask for help diagnosing the very strange things it's doing, such as:
1) at each octave, two adjacent keys play exactly the same note
2) holding down one of the keys causes a stuttering/grinding sound. almost as if they arppegiator were engaged
3) 5 or 6 keys near the bass end of the keyboard don't play at all