sndwv: You could probably fix this by setting the audio prebuffer to a higher value in the .conf file in Tomb Raider 1's folder. Setting it to prebuffer=50 fixed it for me, but you might need a higher value (up to 100). Currently not at my PC, so I don't have the exact file names, but let me know if this works for you.
Thanks a lot.
I've tried different prebuffer values, but it happens the same... Anyway I know this game is very old, and emultion is not 100% perfect.
I guess I can't play Tomb Raider 1 with sound :(