Sounds like some sort of quirk within cubase, to get sx 1 workin successfully i had to download about 5 different cracks and work through them to find the one which would work best with my machine.

Its gotta be havin a twiddle with the asio, but i'd also have a look for some different cracks as a backup.

I havent tried sx 2 yet, and was thinking about it but not so sure now!

If anyone else has tried it it'd be great to hear your opinions of it! :)