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. Compact pedal with versatile vintage and modern BOSS phasing New "Rise" and "Fall" modes create unidirectional phasing Includes classic multi-stage phasers with selectable stages Realtime control of Rate via optional expression pedal.