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What PA do you have in that room and how is it positioned? What you can try doing is playing music you know well through the PA and listening to what (if anything) sounds wrong. If you aren’t sure what you don’t like about it just try moving some eq bands up and down to see if it gets better or worse.

For lapel mics the main concern is normally gain before feedback and then you look at sound quality. Just turn the mic up until it feeds back and then cut the frequency that’s ringing. You don’t really need to be able to identify it, just narrow down a band of the parametric channel EQ and sweep it around until the problem stops. Then push the mic more until it is either loud enough or feeds back again, then cut the next frequency. If you need more cuts than the 4 bands in the channel EQ you need to look at moving the mic closer to the source.

There’s only so much advice that can be given over the internet without actually hearing the problem that we’re trying to solve but this should give you a start.

Clearing the console (parts of it anyway) isn’t a bad thing to do on purpose either, there’s always the danger of assuming that the old settings were the best and now you might end up with something better.