Mu-tron (short for Musictronics) developed a series of highly innovative effects throughout the '70s, including the popular Mu-Tron III envelope filter. The Mu-tron Bi-Phase was a two channel Phase shifter with two "Sweep Generator" sections. This pedal was made with either a two-button or an optical pedal.The optical option is worth slightly more. 

Years of Production: ca. 1972 - 1981

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