MUSITRONICS MU-TRON OPTI-POT C-100
This is what you want to go with your Musitronics Mu-tron Bi-Phase (we may have one - see our other listings): the very rare C-100 Opti-Pot.
It's in very good condition, works perfectly and opens up a whole world of creative expression for your Bi-Phase. Control the phaser's sweep with this optical controller pedal - create your own phase sweep patterns.
Please note that this makes no noise on its own - you need a Mu-tron Bi-Phase to go with it (get in touch if you want to buy ours - we'll do a discount for the pair together).
The pedal is in excellent overall condition, with only minor scuffs and scratches; the original connecting cable is twisted and showing its age, but is fully-functional (see detailed photos below).
At the time of writing we also have a Bi-Phase for sale, and several other rare Musitronics pedals, including a Mu-tron Flanger, Phasor II and Digital Delay (buy the set) - see our other listings.