I *still* haven't been available on a Monday for this, sorry.

On a folk Zoom session I do attend, one participant is very keen we all use the 'Original Sound' option: this is in the audio settings. Clearly it does something, but exactly what is not explained anywhere I have seen. My guess is that it affects a gain control, so that the microphone sensitivity is not being continuously adjusted which would affect the dynamics. But honestly, that is just a guess what it does.