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 Phasor was an early phase shifter with speed and depth controls. An upgraded version with three control knobs was introduced as the Phasor II circa 1976.  

Years of Production: 1974 - 1976

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