The crackle could be caused by overloading your audio levels. Check your master output in the sequencing app. It could also be caused by the soundcard buffer sizes being too small. Try raising these a bit.
I've got a similar problem (and I'm another Swedish user ).
When loading a few instruments (JABB as Vsti in Cubase SL3) there is this strange noise (not a crackle... in swedish I would call it a "bludder" or "bubbling sound" if you can guess what I mean).
There is no overrriding in volume levels or anything like that.
It seems to happen when I play 2 or more instrumentof the same kind (like the trombones).
Would be happy if someone could point me in the right direction for what to do. Sorry for the somewhat vague problem description, as english isn't my native language.
I use Cubase SL (version 3.1) as my sequencer program.
Will try to figure out where to disable hyperthreading...
Could very well be the Kontakt Player causing this, I've never got this behaviour with other samplers (like Halion and SampleTank).
Glad that helped! Most applications that use hyper-threading usually only get maybe a 10% speed improvement. Hopefully all newer versions of software will start taking advantage of dual core and hyper-threaded CPU's. Sonar 5 has much better support as well as a true 64 bit version. Kontakt 2 has better CPU support over the current Kontakt 1.5.3 that GPO and JABB are built on.