Just as a data point, I have never heard an auditory cue from a press of the NVDA key when I've been using NVDA. I am guessing this is a setting somewhere, but not one I've ever used. The one auditory cue I do notice is the change from browse to focus mode, or vice versa.
And I just experimented with NVDA while entering this message via the web interface. Hitting the Insert key (not 6-pack, in this case) does not produce any tone.
Brian - Windows 10 Pro, 64-Bit, Version 1909, Build 18363
Power is being told you're not loved and not being destroyed by it.