I once had a "helmet explosion" involving many beers, lots of curry, sleep, riding a motorcycle the next day, and a belch... Enough of that, though.
There is one thing to try if you haven't already, EG. The mute facility isn't so much designed for when no instrument is plugged in. It's for silent recording and, when activated, kills the power section and the output goes to the XLR "emulator equipped" socket at the back. If a permanent mute is the cause of your problem, then you can confirm this by rustling up a XLR-jack lead and plugging into a guitar amp or using a straight XLR-XLR if you have a PA head handy.
If you get a perfectly OK sound coming out of the PA/other amp, then you know for sure that the mute is the problem and you just have to find out how to fix it. If there's no output from the XLR, then it ain't the mute. This is a much better test than feeding off from either of the FX loops.
I once had a "helmet explosion" involving many beers, lots of curry, sleep, riding a motorcycle the next day, and a belch... Enough of that, though.
There is one thing to try if you haven't already, EG. The mute facility isn't so much designed for when no instrument is plugged in. It's for silent recording and, when activated, kills the power section and the output goes to the XLR "emulator equipped" socket at the back. If a permanent mute is the cause of your problem, then you can confirm this by rustling up a XLR-jack lead and plugging into a guitar amp or using a straight XLR-XLR if you have a PA head handy.
If you get a perfectly OK sound coming out of the PA/other amp, then you know for sure that the mute is the problem and you just have to find out how to fix it. If there's no output from the XLR, then it ain't the mute. This is a much better test than feeding off from either of the FX loops.