A Sturdy Expression Pedal with USB Connection Before those sonic inspirations flicker from your head forever, bring them to realization using the UP4 USB-MIDI Expression Pedal from Crumar. At Sweetwater, this pedal has facilitated some serious speed with regard to our MIDI endeavors. With expression, volume, breath controller, and foot pedal expressions available, you'll find an open door to easier, more colorful sonic creations. If your keyboard controller lacks an expression pedal jack, that's just where the UP4 comes in with its USB connector. Make no mistake, the robust UP4 expression pedal is ready to do some heavy lifting for your software.UP4 USB-MIDI Expression Pedal Features: Based on a sturdy plastic continuous pedal Connects to your interface using USB CC numbers 11, 4, 2, and 7 available Class compliant