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'No One Should Have a Copyright on Vance Being Booed': Video From Olympics Blocked on X
(www.commondreams.org)
This is a most excellent place for technology news and articles.
It's not hard to mask them, just lower the microphones from the audience or play something else instead
We can hear the audience, or an audience.
They may have superimposed another (receptive) audience over the top. In fact just superimposing the audience from a minute before would have drowned out the boos. It would have been possible live too (and it would have sounded natural since it is the same crowd and same acoustics).