YAMAHA FC3A Piano Pedal

A sustain pedal compatible with half-pedaling :

About as close as you can get to natural sustain, the FC3A offers continuous sustain performing exactly as an acoustic piano would. Unlike most common pedals, the FC3A has a unique continuous sensitivity zone that allows for different levels of sustain. This pedal for use with digital pianos, keyboards, synthesizers, and stage pianos. 

Compatible only with the following Yamaha products:

Tyros4 and Tyros5 Arranger Workstations, PSR-S Series Arranger Workstations, PSR-A2000/PSR-A3000 Arranger Workstations, MONTAGE Synthesizers, Motif XF Music Production Synthesizers, S70XS/S90XS Synthesizers, MOXF Production Synthesizers, MX Synthesizers, CP Stage Pianos, P-Series Digital Pianos, DGX-640/650/660 Digital Pianos, Piagerro Series Portable Keyboards, REFACE CP Mobile Mini Keyboards.