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SoundVolumeCommandLine (svcl.exe) is a console application that allows you to do many actions related to sound volume from command-line, including – set sound volume of devices and applications, mute/unmute devices and applications, increase/decrease volume of devices and applications, set the volume level of specific channel, set the default render/capture device, get the current sound volume level of specific device, and more…
svcl.exe is the console version of the SoundVolumeView tool, and you can use all commands of SoundVolumeView in svcl.exe, with exactly the same syntax.