Biostar Support :: IPC Manufacturing, Industrial PC Motherboard Manufacturers

Please follow below instruction to adjusted the audio to 6 channel

Install the C-Media driver & application that had been bundle in BIOSTAR Driver CD.
Select "Start" at Windows Screen
Select "Program"
Select "PCI Audio Application"
Select "Audio Rack"
Select "Mixer"
Press the "Hammer tools" icon, at bottom of left-hand side.
You could be able to setup the Audio Channel at here.

By the way when you had switch the Audio to 6 Channel, the "Line-in" Jack will turn to " Real Speaker Out" and "Mic-in" Jack will be turn to "Center/Subwoofer".