I always hear the introductory music play in the first screen where you choose Game / Configure / Update / Exit. When I get to the next screen where you choose New Game / Load Game etc. and then in the game itself, I get sound about 1 in 5 times I run the program.
I'm running KOTOR on Debian Lenny using Crossover Games 8 on a IBM T61 laptop. The sound manager is ALSA. I've tried enabling 'Force Software' in the game's advanced options. Rebooting or doing a reset in Crossover Terminate Windows Applications makes no difference.