Mute your computer
If you like event sounds in general but occasionally need complete silence from your computer, choose No Sounds in the Sound Scheme list when you want the machine to shut up. (Be sure to clear the Play Windows Startup Sound check box as well .) When sound is welcome again, you can return to the Windows Default scheme—or to any other scheme you have set up. Switching to the No Sounds scheme won't render your system mute (you'll still be able to play music when you want to hear it), but it will turn off the announcement of incoming mail and other events.
If you want to control sound levels on a more granular level—perhaps muting some applications altogether and adjusting volume levels on others—right-click the volume icon in the notification area and choose Open Volume Mixer. (Alternatively, click the icon and then click Mixer.) Volume Mixer provides a volume slider (and a mute button) for each output device and each running program that emits sounds .
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