hello. I've been recording with cubase sx2 and so far having a good time with it except for when I try to use the multiband compressor. I've been trying to use it on the stereo out channel to improve overall loudness and when I do this there is a very distinct hum which sounds like some kind of digital distorton that ends up on some of the tracks. I can especially hear it on the vocal track. Can anyone shed some light on this?