That's the kind of computer, yes. Not all of them have the PCI Express, but they do have normal PCI slots (aside from the low profile part).

Yes, I think you're correct on what I've be looking for. I can't even seem to find any low profile sound cards, so the chances are slim that I could find one with a game port on it. I can't imagine that there'd be enough room for the 15-pin port and any audio jacks. So yeah, I guess that's what I'm looking for.

I don't know what interface it's talking on, unfortunately. I was interested in how it works so I was going to ask one of the guys here about them, but they're a bit busy these days.