"Disable absolute volume" setting (in Developer options) might help. It separates the phone volume control from the headphones volume control so it's like a preamp.
You would want to test the camo. I suspect there is more than just changing ones appearance. I believe I've seen a story talking about not needing to see the entire face. You can still id people wearing neck gaiters and other face coverings if you can make out the facial contour. I think you needed about a third of the face uncovered. https://hyperverge.co/blog/masked-face-recognition/
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