Well, it isn't like you can push the fader up to its max and the little men on the line will get blasted out of the speakers and you're set.
Likely what he was doing as someone else said was seeing at what levels the mics would feedback.
Usually you can putz around with the EQ on the mixer and get rid of hums, buzz, other extraneous noise. If you've got a persistent noise issue, you may have an electrical issue - e..g power cable crossed with a mic cable, that sort of thing...
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