Yamaha CS80

> what Yamaha exp. pedal could be used with a CS80 without damaging 
the electronics? I was thinking of buying a replacement for my exp. 
pedal which got lost someday before I purchased my CS.

I always thought it needed some magic pedal, but I just looked at the 
wiring diagram.  It looks like the pedal is just a potentiometer with 
the ends connected to ground and tip (of a 1/4" stereo plug) and the 
wiper attached to sleeve (the middle contact).  The CS80 puts out 
-15volts on the tip, so you'll get between zero (pedal up/off) and 
-15v (pedal down/max) on the sleeve contact.

Has anyone tried this?  Are there standard pedals like this (I 
haven't looked into this stuff in years)?  Does it need a special 
taper pot?

 David