What exactly do they do? I know the process the sound that goes to the speakers, but i'm putting together a build for a person who intends on using it to do sound editing, and i was just wondering if having a sound card would make this faster, or does it just improve the quality of the sound and the speed at which you could edit sound would be directly down to the CPU? Because the motherboard has pretty decent on-board sound, and while i know even a £10 sound card would improve sound quality, would it improve your experience while doing sound editing? Thanks.
By the way, i'm just trying to save money since they're on quite a tight budget.
The only reasons to get a different sound card for studio work would be for better audio quality (input), and low latency drivers. A $10 card will probably not sound any better than the mobos onboard. The major concern for studio work is the latency. Audiophile cards and studio cards offer drivers with little or no latency (they claim). Do you NEED it to do work? I don't know, but I have done amateur recording with different cards, as well as onboard sound, and they worked out for me.
One thing for certain: The audio inputs on a good card are much better for recording. The parts used in a $100+ card are miles past the onboard's inputs, though they are getting better.
Check out products by M-Audio and Auzentech, they use good parts and have made studio boards for a long time. Here is one that looks good to me (doesn't save money for you, but you can see what to look for)