[Fontaine]

I was having some serious sound issues with nearly all my games, including MOHAA and -SH, using an old Yamaha dsxg sound card. Lag, choppy animations and what-all. I replaced the SC with a SB512 card and man, what a difference. No lag, no choppiness, and even more bizarre, my network connection improved.

My impression is that some of the newer games are using hardware specific features that older cards don't support, and thus have to be emulated in software, resulting in overhead and reduced game fidelity. So you might consider upgrading your sound card if it is more than a couple years old.