G-Lab DR-2 User Manual - page 6
Manual is about: Dual Reverb
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If your amp is equipped with SEND output signal level control then you should set
the active reverb LEVEL control to maximum and set in a such way your amp SEND
output signal level control to be at the edge of lighting up the DR PEAK indicator (it is
recommended to set the amp channels controls at typically used positions and to check
all the channels). Then you should adjust RETURN input gain control to receive the
same signal level (volume) when the effect loop is active or not.