>I really recommend the Yamaha FC7, the "foot controller" that goes >with the Yamaha DX-7 and other models.
Works fine on #805, was $30 or so used at Daddy's Junky Music.
Note that it's not really a "swell" pedal as in the M400, which varied the volume within a certain range. The FC7 goes from no sound all the way to 11. :-)