I just finished recording some tracks and noticed what sounds like intermittent static. I muted one track at a time to try and pin down the problem but it was still there even after all the tracks were muted. Then I figured it might be coming from my preamp or mixer so I shut them down. But even then though I cant hear anything any more cause all my gear is off, I can still see a little intermittent blip on RBs VU meter which tells me it's probably coming from my PC.....any ideas