Gigabyte Processor Motherboard GA-7N400S-L User Manual page 73

STEP 4:
After installing the audio driver, you'll find a Sound
Effect icon on the lower right hand taskbar. Click
the icon to select the function.
STEP 5:
On the AC97 Audio Configuration menu, click the
Speaker Configuration tab and select the
6-channel mode for 5.1 speaker output check box.
Select the Only SURROUND-KIT check box and
press OK.
Basic & Advanced 6 Channel Audio Output Mode Notes:
When the Environment setting is None, the sound
would be performed as stereo mode (2-channel
output). Please select the other settings for 6
channels output.
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