AVer EVC130 user manual - Manual (Page 53)

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MICROPHONE
EVC main system allows you to adjust the MIC Gain Level up to 9 for proper MIC volume to improve
audio reception on the microphone (s).
MIC Gain Level
Select Video/Audio│Microphone and press
.
Adjust the MIC Gain Level form the drop-down
list.
MIC Input Source
Select the source of the MIC from the MIC in or
Audio in. If you connect a MIC in AUDIO IN
port, we recommend selecting Audio in
selection to avoid the echo issue.