Mission Engineering's SP1-L6H expression pedal is purpose-built for Line 6's Helix Rack guitar amp/FX modeler. The SP1-L6H gives you smooth, expressive control over the Helix Rack, perfect for wah and rotary speaker effects. It has a toe switch to engage/disengage your effect of choice for ease of use. Just connect the output of the SP1-L6H to your Helix Rack and assign the switches to the effects you want to toggle. Mission Engineering presents some of the most popular control pedals at Sweetwater, and their SP1-L6H expression pedal gives you a convenient way to control your Helix Rack.