The EHX Cntl Knob is an affordable, compact, easy-to-use pedal that delivers static remote control for devices with expression control jacks. It lets you set two preset values that represent two positions of a traditional expression pedal and toggle between them with its footswitch.
 
-on/off foot Pedal switches
-EXP 1 knob
-EXP 2 knob
-1/4" mono input and stereo output jack
-DC 9V 5 mA power in jack