The instrument
The Jen Motorphaser probably came onto the market in the early 1970s. It is equipped with tremolo and chorus, which can be switched between at the touch of a button.
Details
Jen Motorphaser rotary-emulator featuring zero pots and all footswitches. Powered by battery only, he is essentially a 4-stage analog phaser with two rates (fast & slow) and two levels of depths (full or subtle). The Motorphaser also features an ingenious battery compartment that slides open and closed.