The MXR Phase 100 first hit the market in 1975. It was designed from a totally different circuit than the Phase 90 and Phase 45, offering its own range of fluid, textured tones and 4-way switch to change up the waveform of the effect from wide and shallow on one end to deep and narrow on the other. Heavyweights from Keith Richards to Billy Corgan have made magic with this pedal. The MXR Phase 100 adds a ton of tonal versatility to a fantastic effect–all while maintaining the simplicity that make