Gigabyte GA-7DX User Manual page 44

7DX Motherboard
e. Click "Digital" item, Line Out will be reconfigure to SPDIF Out.
f. Recommend you to select "Autosense", It will automatically detect the type (mono or stereo)
of the audio connector that you plug into Line Out audio jack, then configure Line Out to
either SPDIF or Speaker accordingly.
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