Gigabyte GA-8ST Series User Manual page 65

Advanced 6 Channel Analog Audio Output Mode (using SURROUND-KIT):
"SURROUND-KIT" is an optional device, which ac-
cess analog output to rear channels and Center/
Subwoofer channels. It is the best solution if you
need 6 channel output, Line In and MIC at the same
time.
STEP 1 :
Insert the "SURROUND-KIT" in the back of the case,
and fix it with the screw.
STEP 2 :
Connect the "SURROUND-KIT" to SUR_CEN on
the M/B.
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Technical Reference