If it came with a soundcard, I can understand the missing manual, but are you sure there isn't any info in pdf-format on the program cd? At least from VST/32 onwards the online help is also pretty comprehensive, so you might want to check that. They probably don't spread the newest SX2 bundled with a soundcard around, so...which version on Cubase do you have? This sounds like a basic latency issue, though.