The MXR Deep Phase Pedal delivers uniquely expressive vintage phaser tones with the impeccable build quality and tweakabiity that MXR is famous for.With just two knobs and a switch, the Deep Phase Pedal offers a wide range of phase tones, from subtle liquid shifting to thick, swirling turbulence. The Speed knob adjusts the effect rate, while the FDBK knob adjusts the intensity and sharpness of the phase peaks. By default, the Deep Phase Pedal runs on 4 phase shifter stages for a smooth effect. The Mode II switch doubles that to 8 stages for twice the number of peaks and a more animated texture.