Hi, I have a Godin LG Signature edition and every wah pedal I've ever used with it has overtones on certain notes when the pedal is rocked all the way back. This happens regardless of whatever amp I play it through.

I think I'm going to bite the bullet and try modifying my first pedal, just to see if I can fix this problem. Does anyone have any suggestions about where to go or what sites to look at? Right now I have a Vox Wah Pedal Model V487