G-Lab DR-2 User Manual - page 8
Manual is about: Dual Reverb
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Connecting to the GSC (Guitar System Controller)
The DR can be controlled and supplied form the GSC controllers of the G LAB
brand. In such a case the SW1&2 (or SW3&4) output of the GSC connect with the DR
FOOT PEDAL input by a Jack/Jack mono cable.
According to the signal (only in case when we don’t use the amp’s reverb) it is
recommended to connect the DR between the GSC and the amp input.