Wait, were they PEAKING (also called CLIPPING, when a sound wave curve gets forced into square-shaped waves due to the amount of amplification) or FEEDING BACK (that squealing noise when a mic's signal is amplified too much and it picks up its own signal)?
If they were feeding back, did the tech just run the fader up 'till it fed back and bring it back down? Did he change any EQ or gain settings at all? I'm confused by your description.
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