I had crackling audio once, the fix was simply to lower the volume of XBMC (not the TV or Sound System's volume but the volume of the XBMC app). It seems anything below full volume should work, give that a try first.Ok so I have updated my drivers.
I have installed a new codec pack
Made the audio on OS exclusive use.
But still the crackling.
When playing the exact same media via Classic player without XBMC no problem.
I will try to revert back to a older version of XBMC and see if that solves mu problem.
Else I will be using the USB crappy sound card for now, untill a fix or updated driver comes out.
Regards