Used and in great condition, the Warm Audio MUTATION PHASOR II is a faithful recreation of a classic 1970s optical phase-shifting pedal, delivering rich, swirling analog modulation perfect for guitar, bass, and keys. Featuring an all-analog circuit with a 6-stage phasing design, this pedal offers warm and vintage tones with a wide range of speed and depth. The intuitive single Speed knob allows for easy dialing from slow, spacey sweeps to fast, pulsating phase effects. True bypass switching preserves your signal when inactive, and its rugged metal enclosure ensures road-ready durability. This used unit shows minimal cosmetic wear and functions flawlessly, making it an ideal choice for players seeking authentic vintage-style phase tones at a great value. Powered by standard 9V DC or internal 9V battery.