I just acquired one of these in a package deal. Unfortunately it's not working properly. I know there are folks I can send it to for an overhaul but I thought I'd ask here first. So it "wahs" when engaged, like a wah pedal rocking back and forth, but it doesn't "auto-wah"- it doesn't react to individual notes or pick attack, no matter where I set it. Any Mu-Tron experts in the house?