Everytime I hook this thing up, it makes a loud humming noise. Now I know nothing is wrong with the cables, I just bought them and they work fine when I am running directly to an amp...its being powered by AC instead of a 9 volt as I cannot find one lying around....I'm not sure what else to say about it really. When the hum is going the bass isn't doing anything, so the problem seems to be coming from the pedal.
Most likely the hum is coming from the AC power. I had a pedal that was hooked with AC instead of the 9 volt and it was doing to same thing.
The adapter you are using probably isn't suited to the pedal, just go to a music store and ask for one for a dunlop wah, tell them one and they should have a cheap one for like 5$