how please i know the line in and mic are used as out puts foreach channels how do i enable it thought?
In Control Panel, Sound, make sure you set the speakers to 5.1
Then in the volumne app, open up the Properties and display Front Speaker, Rear Speaker, Center Speaker and click Advanced for each. If I remember correctly, Front Speaker has options to enable Smart5.1 and SPDIF Out, and Center has options to mix the Center with the Front channel, and Rear has an option to enable Magic5.1 and also to mix the LFE with the rear (or something like that).
When I tried using the 5.1 I noticed severe crackling and static on all music. I ended up going back to just the stereo output and using two RCA Y splitters to hook up my two amps.