Posted this subject 6 weeks ago and just following up. I'm not too concerned about this other than the fact my amp is still under warranty. I get an annoying intermittent buzz coming through my Boss Katana. Sometimes it's quiet as a mouse, other times the buzz is very audible. Only seems to happen on preset tone patches that incorporate a compressor in the effects chain. If I hookup my computer and remove the compressor from the patch's chain, no more buzzing. My internet research says this is a very common problem. I've tried everything I can think of to diagnose the issue. Visually inspected my guitar's connections and solder joints, replaced the guitar cable with new, killed every circuit in the house except the amp's, disabled every battery driven device, checked the wall outlet's ground, etc, etc. The only consistent thing I've noticed is that turning down either my SG's volume OR tone knob silences the buzz. Does this sound like an amp issue, guitar issue, electrical interference, or "dirty power"? Can something happening at my neighbor's house, utilities supplier, or general locale cause this kind of thing?