Hey orbital,

  For each preset that you would like to use the WAH on please try the following configurations:

  -Add the Wah model you would like to use.

  -Select the Wah's FX block within the signal flow view.

  -Press and hold the "Enter" button, this should engage FS assign view.

  -Use the first encoder knob to assign the wah to "EXP Toe Switch".

  -Press the View button once you are done to exit.

  -With the Wah FX block still selected, double press the Move button to enter the controller assign. Assign it to EXP 2 then back to EXP1.

  This should allow to use the expression pedal as the wah and click it down to turn it off.

  If you set it up for EXP 2, you can click on the wah to engage and disengage it.