Hello,

     My FBV MkII board's Wah does not seem to be working right with my Line 6 Spider Jam Amp. When the pedal is changed from a volume pedal to a wah pedal is has a loud banshee like screech sound. All thou this sound only occours when it is set on a setting like "Slipknot", or some other distorted signal. So if anybody could help me on what is happening, or how to fix it, please leave a post below.

Thanks