Call quality microphone (that old issue!)

I know theres tons of posts and potential fixes for the call quality issue, apparently caused by the noise cancelling mic on the rear. I've tried most (on the missus 6p) but still the issue intermittently and it bugs me as I have to hear it!
I'm prepared to root the phone if I have to but a quick question.
The root, then disable noise cancellation, has this worked for you guys and does it affect the microphone when recording video?

I read putting tape over the rear microphone is supposed to work but affects audio as the video recording uses the rear microphone.