I agree. Too many open mics on stage. I have to wonder why the BE couldn't spot the channel causing the problem??
On my usual corner stage, I have had sympathetic vibrations between a bass amp and floor tom that was clearly audible on stage but not at FOH.
It seems to most likely happen when the bass amp and floor tom are on the same side and I am not running a wedge.
Since the loop is not actually in a mic you can't break it by muting anything, nor does it get past the gates into the mains.
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