The BOSS PH-3 Phase Shifter pedal provides a wealth of vintage and modern phasing effects, including new "Rise" and "Fall" modes for unique, unidirectional phasing. Syncing these phasing effects is as simple as tapping the pedal to the desired tempo, while an optional expression pedal provides realtime control of the PH-3's Rate, Filter and Tempo. Rate, Depth, Res controls, along with multiple Stage modes. Holding footswitch allows you to set the tempo. Expression pedal input. • MFSKU PH-3 • UPC 761294053034