Foxconn NFPIK8AA-8EKRS - Manual (Page 110)

Appendix
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STEP 3. After installation of the audio driver, you’ll find an icon on the taskbar’s
status area. Double click the icon, you will see the following picture.
STEP 4. Click icon. The following picture will appear.
STEP 5. Make sure you select “7.1 Speakers” from the above picture. Now you
can enjoy the 8-channel audio function.
Click here
Click here