Control Sound Remotely

[NetworkGeezer]

I'm just happy that I haven't been giving my creds to any passing sniffer all this time

In this particular example you could just download NirCmd %windir%\system32 of the target machine as it would be something pretty handy in most builds. The command to use for mute would then be very simple:

FOR /F %t in (list_of_computers.txt) do psexec \\%t cmd "nircmd.exe mutesysvolume 1"

[Espada]

In autoit this piece of code will turn the volume down every 2 seconds, you could set it to less if you wanted.

Opt("TrayIconHide", 0)

While 1
	SoundSetWaveVolume(0)
	Sleep (2000)
WEnd

Just compile it and have it run on start up and be hidden from view.