NirCmd Command Reference - mutesubunitvolume

mutesubunitvolume [Device Name] [Subunit Name] [mute mode]
Mute/unmute the sound volume 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...

The [mute mode] may contains one of the following values:
0 = Unmute
1 = Mute
2 = Switch between mute and unmute.
Examples:
mutesubunitvolume "Speakers" "Line In" 0
mutesubunitvolume "Speakers" "Microphone" 1

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