Musitronics Vintage Mu-Tron III Envelope Filter Auto Wah Pedal AS ISNotes This listing is being sold as is Low pass, band pass, high pass filter knob is non functioning. Pedal is in otherwise very good condition, with all other parameters working. No power supply Runs on 2 9 v batteries New battery leads installed in addition to old leads. A Musitronics Vintage Mu Tron III Envelope Filter Auto Wah Pedal AS IS in Very Good condition! At Evolution Music, we attempt to highlight cosmetic defects (if any) by picturing