NirCmd Command Reference - setsubunitvolumedb

setsubunitvolumedb [Device Name] [Subunit Name] [Decibel Value]

Set the sound volume (in Decibels) of sound device subunit.
The [Device Name] is the name of the device, as appeared in the sound devices list of windows. In most cases the device name is 'Speakers'.
The [Subunit Name] is the name of a subunit, as appeared in the 'Level' tab of the device properties window. Examples for subunit name: Phone Line, Microphone, Internal MIC, Line In, and so on...
Examples:
setsubunitvolumedb "Speakers" "Line In" -25
setsubunitvolumedb "Speakers" "Microphone" -10

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