I normally use this system as a slave device but while my other computer is being fixed I'm using it as my main computer. Audio plays back but there is a constant buzzing which is independent of cubase (it doesn't move the meters or react to volume adjustments). In "Settings", AutoSync Ref shows No lock. In Sync Check it shows "no lock" for all three options. System Clock shows Mode: Master and Freq. 44.1kHz. How do I get this running right? Any pointers are appreciated, thanks. -s