Former concert sound guy here! Before the show, the sound folks will work with the performers to configure all of the processing and mixing—sending different audio to different speakers, adjusting the amplification on microphones, etc. Typically, the audio processing on a vocal line will include software (called filtering) to eliminate sharp peaks in the feed (like bumps). Modern sound boards can pretty well filter out everything coming from a microphone that isn’t made by a human voice.
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