Gateway NV7802u - NV - Core 2 Duo 2.2 GHz Reference Manual page 44

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CHAPTER 3: Setting Up and Getting Started
To mute the volume, click
volume, click it again.
To adjust device volume levels, click Mixer. The
Volume Mixer
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
X
close it.
(Mute). To restore
dialog box opens, where you can