VIA Technologies VT8237R Manual page 11

In utility, double click "AC97 Audio configuration" icon
window tray on the right bottom.
Then the "AC97 Audio Configuration" will appear. Click on the Speaker
Configuration tab to select the audio mode.
A. When you choose 4-channel mode for 4 speaker output, the selected item
is showed as below (Figure1)
B. When you choose 6-channel mode for 5.1 speaker output, the selected
item is showed as below (Figure2)
(Figure1)
(Figure2)
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from the