Gateway M-1412 Reference Manual page 58

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CHAPTER 3: Setting Up and Getting Started
To mute the volume, click
click it again.
To adjust device volume levels, click Mixer. The Volume
Mixer dialog box opens, where you can click and drag
sliders for individual devices.
Tip
Adjust the Windows Sounds slider to change system sounds
volume independently of general volume (such as the volume used for
music and game sounds).
Click in the top-right corner of the window to close it.
X
(Mute). To restore volume,