"Why people don’t check their broadcast quality before astounds me, "
Possibly because they don't know how to? I do my best to make sure my mics are set up properly, but I've no idea what it sounds like at the other end. The club organiser will soundcheck a booked guest before the event starts, but it isn't practical to soundcheck maybe a dozen floorsingers.
How can a performer check their own broadcast quality?
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