Pedals we recommend using with our products are as follows:

M-Audio EX-P. This pedal has a polarity switch. Set this to M-Audio for the correct response.

Moog EP-2.

Pedals we have tested (with known issues):

Roland EV-7 - this pedal has a marginally dead spot with our products (due to the design of the pedal)

Roland EV-5 - this pedal has a marginally dead spot with our products (due to the design of the pedal)

Pedals we do not recommend using:

Yamaha FC-7. This pedal has the correct law pot , but incorrect wiring. This can be made to work by rewiring the TRS jack or making an adapter lead, but it won't work out of the box.

Korg EXP-2. This pedal is totally incompatible.

Line 6 EX1 - Although sold as an expression pedal, it isn't wired as an expression pedal (mono jack rather than TRS jack).