My guess is it's the wah pedal. The inductor in a wah acts as an antenna, so it could be picking up some radio signals.
This from Dunlop:
"This is a common occurrence because the inductor in the Wah pedal acts as an antenna. When you are in an area with a lot of radio frequency, the pedal can and will pick up radio stations. It is not very easy to troubleshoot and fix, because it differs so greatly due to the different signals and the varying surroundings. What may work in one region might not work in another.
Check the inductor. If you have a metal inductor, you can purchase a shield from us and place it over the inductor with a ground wire that is placed under one of the screws on the PC Board. This acts as both an AC Hum and RF shield. (It is part number ECB99 - and lists for $12.00) If this doesn't work then...
Wrap the entire black wire harness in Mumetal foil, which comes in a tape format, and hope that that works.
Getting radio stations on your wah pedal is unfortunately, the nature of the beast, and has been that way since its inception. In some areas it is worse than others. It is especially bad in the great lakes region because the lakes act as large antennas sending out the radio signals to all areas - and all wah pedals."
These are just a couple of solutions.
I hope this helps.
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