Acer TravelMate 330 Series User Manual page 49

If the speaker icon is not displayed on the taskbar, enable
this feature (show volume control on the taskbar) via the
Multimedia icon in the Control Panel.
2. Click on the Options menu and select Advanced
Controls.
3. Click on the Advanced button that now appears in the
Master Volume Balance column.
4. Click 3D Effect to enable the 3D effect feature.
5. Click on OK.
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