I've had this small unit sitting on a shelf and never use it. Its in good shape. Missing one keypad. Here's what the unit basically does:

http://cgi.ebay.com/Yamaha-MU15-Tone-Gen...14#ht_721wt_932


I used it years ago to add strings and vibes to my old Yamaha P200 digital piano. (It comes with a AC power supply.)

I see this unit for sale on Ebay for $91.00 up to $114.25...

$50 bucks plus shipping makes it yours...(The unit on Ebay is NOT mine, I referenced it just for informational purposes...)

Holler if interested...