Yamaha FC7

Volume/Expression Pedal

The FC7 is a heavy-duty volume/expression controller with "fortissimo function," which enables the user to accent certain parts of a performance. Adjustable pedal angle, spring point adjustment and a metal connection plate for multiple pedal "ganging," add a unique touch to this volume controller tailoring the pedal to various playing styles. The FC7 can also be utilized with the DG Series amplifiers.

https://usa.yamaha.com/products/music_production/accessories/fc7/index.html