Hi - I am in Raleigh, NC and have a local friend who is selling a module that was used with a MIDI accordion. I think it's a Ketron module, I can check. The person bought it about 2-3 years ago. I remember that it seemed very powerful (in features, sound etc.) I know it was made primarily for MIDI accordion but he did sometimes tie his KN-7000 to it.

Email me if you want to know more.
jimlaing@mindspring.com