Here is the promised list of compatible expression pedals:
These ones are known to work right out of the box:
Korg XVP-10
Mission EP-1 - as long as it has the "reverse polarity" switch
Rocktron Hex
These ones need modification
All Boss and Roland pedals
Mission EP-1 standard polarity
The modification to change a pedal's polarity is pretty easy: just swap the tip and ring wires on the expression output jack. Leave the sleeve wire where it is.
These ones are known to work right out of the box:
Korg XVP-10
Mission EP-1 - as long as it has the "reverse polarity" switch
Rocktron Hex
These ones need modification
All Boss and Roland pedals
Mission EP-1 standard polarity
The modification to change a pedal's polarity is pretty easy: just swap the tip and ring wires on the expression output jack. Leave the sleeve wire where it is.