I tried to fix the cracking problem last night by installing new drivers for my soundblaster live, which only made my sound worse.
Then I read a post by cue-ball that his on board sound didnt have the problem, so I tried and it worked. Only prob with the onboard sound was that CSR started to produce sounds with a lot of cracking in it (and not lfs :really
.
So i went back to my soundblaster live, deinstalled all the creative crap from add/remove software, and tada, no more cracking sounds in lfs.
I have no idea what really happened with my changes, but apperantly you can get rid of it.
My advice would be to remove all the sound crap, like utilities, drivers, or even revert to older drivers.