GIGABYTE AMD Socket 939 Processor Motherboard GA-K8NMF-9 - Manual (Page 71)

Appendix - 71 -
English
STEP 2:
Following installation of the audio driver, you'll find a
Sound Effect icon on the lower right hand taskbar.
Click the icon to select the function.
STEP 3:
Click "Speaker Configuration" and select the "UAJ
Function". Then click on the left selection bar and
select "4CH Speaker" to complete 4 channel audio
configuration.
4 Channel Audio Setup
STEP 1:
Connect the Front Speakers to "Line Out", the Rear
Speakers to "Line In".
Line In (Rear Speaker Out)
Line Out (Front Speaker Out)