hmm...I downloaded VDM sound and the doomsday engine, and Jhexen, but, I'm having trouble figuring out how to use them...I'm kind of new to this, could you give me some advicee?

I'm having a problem with 2 games, Heretic, and Blake Stone. Both are having the same problem, where during the game, whenever a sound is played, the whole game slows down and lags. I can't get music to work for either of them also. Athlon AMD 1700+ Elitegroup K7S5A Mainboard Geforce 2 MX400 256mb …