I have the Shortboard with the HD Pro and the expression pedal works great for volume and for wah, but how do I get it set so that when I press it down to turn off the wah it actually turns off the wah and doesnt leave it set to wide open? Right now it changes it back to a volume pedal, but it leaves the "tone" of the wah as if I had it all the way open. If I click the toe button, I want it to turn the wah off and switch back to be the volume pedal.