0% Interest for 24 Months! Learn more »
(800) 222-4700
  • Español: (800) 222-4701
Dad Gift Card


My Mission Engineering EP-11-S Expression Pedal isn’t working correctly with my Ground Control Pro.

If you are trying to use your Mission Engineering EP-11-S Expression Pedal with your Ground Control Pro but it’s not behaving correctly, try flipping the polarity switch located underneath the rocker. Be sure that the unit is turned off and unplugged before doing so.


The EP-11-S is pre-configured to work with the 11 Rack. To use it with other pedals, flipping the polarity switch may be required.

Click here for 28,000 answers to your tech questions