Then you've incorrectly assigned a modifier on the Wah block Level control...If I follow the G66 setup, the volume pedal works as it should.
The switch turn on the wah, but when I rock the pedal back and
forth, it is turning the wah volume up and down.
In order for the pedal to control the Wah, you need to assign it as a modifier to the Control parameter of the Wah block.Sorry Paranoid, I'm not following you.
Modifiers are assigned to block parameters.