Need advice on this. When I adjust the volume on my FireBox I get crackling in my Left monitor. If I swap the cables at the FireBox outputs the crackling switches sides. I thought that it was a cable issue, but the cables have been replaced and the crackling remains. I contacted PreSonus about this and they said that the master pot is bad. My unit is no longer under warrantee so they want to charge me a flat bench fee of $75 plus shipping and two to three weeks of my time. NO THANKS! It's a $3 pot and a 5 minute fix. I'll either fix it myself, live with it, or buy an upgrade interface a-la ONYX or something. What do you think?