Sounds complicated and totally beyond my understanding, but also very interesting; my brother has a fledgling interest in mixing music (for want of a better term) himself so I thought I'd ask an expert what was involved.
You'll have to let us know how your new PC build copes with the task of fusing live music. And maybe even post a link to a short sample or something? A bet there are plenty of folk here who'd appreciate that. I'll look up details about the soundcard since I'd not heard of it before. Best of luck then.