Amazon.com: M-Audio EX-P | Universal Expression Pedal for Keyboards, MIDI Keyboards/Controllers and Supported Guitar Effects Pedals : M-Audio: Everything Else
Amazon.com: Novation Impulse 25 Keys USB bus-powered MIDI Controller Keyboard – Robust, ultra-responsive, full-size piano keyboard with aftertouch and velocity-sensitive pads – works on Mac or Windows : Musical Instruments
Headrush Expression Pedal - Premium Expression Pedal with Toe Switch | eBay