Gigabyte GA-7ZMM User Manual page 43

Four Speaker and SPDIF Introduction
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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