Musitronics Mu-Tron Bi-Phase with C-100 Opti-Pot Pedal Book there is a photo displaying

there is a photo displaying these minor flaws

Starting simple

some surface oxidation of the XLR sockets (does not affect use at all)

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

The case has almost no noticeable scuffs or marks to the black tolex

Musitronics Mu-Tron Bi-Phase with C-100 Opti-Pot Pedal Book there is a photo displayingComplete 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