Gigabyte GA-P75-D3 User Manual page 73

C. Activating an AC'97 Front Panel Audio Module
If your chassis provides an AC'97 front panel audio module,
to activate the AC'97 functionality, click the tool icon on the
Speaker Configuration tab. On the Connector Settings
dialog box, select the Disable front panel jack detection
check box. Click OK to complete.
D. Muting the Back Panel Audio (For HD Audio Only)
Click Device advanced settings on the top right corner
on the Speaker Configuration tab to open the Device
advanced settings dialog box. Select the Mute the rear
output device, when a front headphone plugged in check
box. Click OK to complete.
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