well, i am not creative tech support, but i will try.....
first, what software are you using to record with?
secondly, what sample rate are you using in that software?
IIRC, all SB-type cards default to 48k, which causes problems with 44.1k. many many people recommend against using SB cards for any serious recording.
i would try recording in 48k and see what it does for the crackle.
if that doesnt help, then you probably *would* do better at the creative forum, or somewhere like homerecording.com.
good luck.