The Roland US-20 is a unit selector designed to allow a guitarist to connect two devices featuring a GK IN connector, such as the GR-1 or VG-8. It enables the user to select which device to play using the [A/B] pedal switch or to play both devices simultaneously using the [BOTH] pedal switch.
To operate the unit, the GK-2A synthesizer driver must be installed on the guitar and set to the [SYNTH] position. The US-20 is powered by the unit connected to the UNIT A connector. The manual details the panel descriptions, connection procedures, unit selection methods, and technical specifications.
| Dimensions | 160(W) x 134(D) x 38(H) mm |
|---|---|
| Accessories | GK Connecting Cable : C-13D(1.2m) x 2 |
Depress the [A/B] pedal switch to change the selected unit; a red LED indicates UNIT A is selected, and a green LED indicates UNIT B is selected.
Depress the [BOTH] pedal switch to hear both units simultaneously; the LED will light in yellow.
The direct sound from the guitar can be heard, but it cannot be controlled with the [SYNTH VOL] or the [A/B] pedal switch.