using a PC- Few questions?

I want to use a PC for a head unit.

any input on this?

The idea is to run a PC with a sound card w/ 6 channels. plug the PC into 3 amps to power front, rear, and subs. And then I can add what not to the PC.

First question: Dose anyone know of good software for this? I know PC have been used before but maybe not like this.

second: If I know right, the amp uses an anolog signal and the head unit controls the amps volume by voltage.. Where a PC would raise the volume through the anolog signal. Is that right and would there be a way to control the amps via the PC?

Any good ideas on this would be grate! Maybe Im barking up the wrong tree on this but would be cool. I have a PC and 3 amps but an older Head unit and just wanted to do away with it.

What I have..

p4 2.53-512MB-soundblaser

i can use 3 300 watt JL amps - www.jlaudio.com/amps/3002.html

or I have 4 panasonic 200 watt amps.

go ahead and just buy the $5 audio out rca splitter from radio shack and then you can compare that with your headunit. the soundblaster audigy card should be fairly comparable to most headunits so you can decide if you want it or not after listening to the two back to back.

to run the amp you are going to need power for the amp, rca cables, and an rca splitter for your computer's audio out. as far as software is concerned you really don't need anything. i'm sure there is some computer software that will let you tweak all the sound settings, but i wouldn't worry about that just yet.