HQRP Sustain Pedal is suitable for all electronic keyboards, synthesizers, tone modules or drum machines with 1/4" phone jack sustain-pedal input. The pedal is made in piano-style and has a specially designed lower rubber part allowing the pedal to stay in place while you play. This pedal can also be used as FS controller.Compatible with Yamaha FC3 / FC4 ; M-Audio SP-2 ; Kurzweil KP-3 Replacement.