The US-20 from Roland is a floor pedal unit that allows a guitar that's equipped with GK-2AH to control and switch between two GR-compatible devices, such as guitar synthesizers. The unit features one GK-2AH input and two C-13 cable outputs. It also has two foot pedals for switching or combining the connected GR devices. It has a durable metal housing to withstand life on the road.
Note: The US-20 is compatible with the GR-33, GR-30, GR-1, GR-09, GR-50, VG-88, VG-8, and GI-10.