I have an Ensoniq MR-76. It's a great machine, but recently the sustaining pedal has stopped working. I have checked connections, looked for dirt or obstructions--but I see nothing evident to the naked eye. I attempted to see if the pedal has failed, using a pedal I have is for a Yamaha P-100, but I detected no change. Any suggestions on how to fix this dilemma?

Charlie Crow