Musitronics Mu-Tron Bi-Phase with C-100 Opti-Pot Pedal Book There is a sticker above

There is a sticker above the mode selector know as shown in the photos

there is a photo displaying these minor flaws

6 - it autotunes without issue once it's been allowed to warm up

Change the Pitch and Tempo of the loop in 1/2 step increments

Musitronics Mu-Tron Bi-Phase with C-100 Opti-Pot Pedal Book There is a sticker aboveComplete with the rare Opti Pot controller. Serviced, calibrated and in full working order sounds superb. The condition is good with the usual signs of age. There are scratches, scrapes and dings to the case, but it's built like a tank and nothing affects the operation. The knobs have some wear and the tops have been re painted black to cover minor scratches. Click on the photos to zoom in and see more shots. The Opti Pot pedal has been modified to