Please click the start button from tools bar, then follow the instruction as below to modify the Audio mode.
-> Start -> Settings -> Control Panel -> CMI Audio Config -> Speakers -> Change from 2 channel to 4 channel.
By the way, the Line in port (blue color) where is on your parallel port that it will be became another line out port as same as the original line out port (Green Color). Our motherboards as M7TDK & M7TDQ able supported this 4 channel audio function.
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