Nolan NSRXRM3C2HRS User Manual page 14

Adjust microphone gain, input audio volume or
mute
The four volume buttons, Mic Gain Up/Down and
external audio Volume Up/Down, provide the
flexible volume tuning functions.
Internal Mic
Gain Up
Line in
Volume Down
/Mute
Internal Mic
Gain Down
/Mute
G+ and G- : Single press to increase and

decrease the internal microphone gain.
G-: Press and hold about a second to mute

the internal microphone, the
slowly. Then press G+ to un-mute
V+ and V- : Single press to increase and

decrease the external microphone or audio sound
volume.
V-: Press and hold about a second to mute

the microphone, the
Then press V+ un-mute.
Internal Mic Line in/
External Mic Selection
amber LED
amber LED
Line in
Volume Up
will flash
will flash slowly.