The actual high-pitched screeching is USB error, or the data stream leaking into the battery cables.
I applied Mosquito-Killer after 1 second.
This is the plugin.
https://forum.audacityteam.org/t/usb-whine-filtering-yeti-curse/45601/35
And I set it for 8 mosquitos.
This is not a completely free “get-out-of-jail” card. Mosquito Killer is removing 1KHz and multiples of that tone from the show. If someone in the show rang a bell at exactly one of those tones, it would vanish.
Anything else we can do?
Koz