This head sat in my closet for a couple years. Just dragged it out to try to use it, and all the amp models except metal and insane are now far too quiet to use. On the Clean model, I have to put the master volume around 3 o'clock to be usable, which of course means I can't then switch to a dirty model without risking a ripped cone and a courtesy call from the cops. Any idea what could be causing this? I've tried several different speaker cabinets no difference. It even does it through the headphone jack, though it isn't quite as much of a volume drop through the headphone jack. If it's a bad part on the board, I could probably replace it, just not sure where to start with testing.