I just got a new Budda wah. I run it through a Peavy Valveking 112 and I'm playing a ESP Eclipse. When I put the amp on the dirty channel and switch on the wah I always get a ton of feedback, however, when its off I don't get any feedback.

So, I don't think that it is a matter of being too close to the amp.

Any suggestions on how to get rid of the feedback I get every time I switch on the wah?