Asus M3N78-VM - Manual (Page 23)

User Guide
VT1708A VIA HD Audio Adeck For Windows 2000, Windows XP & Server 2003
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When a hot key is pressed, the screen will show a green volume control bar at the bottom of the screen
and a mute/un-mute icon at the top-right corner of the screen. The on-screen display can be hidden by
pressing the “Show/Hide” hot key.
Figure 23 - Hot Key - Set Volume with Hot Key