MXR M107 Guitar Phaser Effects Phase 100Big brother of the Phase 90 with a broader range of sounds Four position rotary switch selects four preset waveforms Spacey, psychedelic ambience for guitar solos or chords! Designed as a phaser guitar pedal that augments the dynamics of your playing, the Dunlop MXR Phase 100 M107 lets you extract a spacey ripple from your guitar. Featuring a tone and an intensity knob, this Dunlop guitar effect pedal gives you ample independence for tone crafting.