[cjoelrun]

My Airpod Pros literally screech at an unsafe noise level if they're in Transparency or Noise Cancellation. I think some part of them got damaged ruining any kind of processing. I've been able to continue to use the in the Off mode for over a year. Hope this isn't too annoying to opt out of.

[spaceguillotine]

sounds like a microphone is broken or clogged up with human skin goo

[Aaron2222]

Yep. Good chance it's clogged up with earwax or something. I have similar issues with mine (a high-pitched whine on when in any of the ANC modes on my current AirPods Pro 2's right AirPod, and a lower-pitched rumbling in my old AirPods Pro 1's as well).