Hmmm, that has not been our experience about the sound. I have never heard a sound in my MX. Yup, there is a flashing bar, but we focus on the road not on the display. If it weren't for the kid in the back seat saying "Mommy it is flashing" (when she is driving), she probably would have been in AP jail more often. As for me, I manage to naturally keep a torque force on the wheel so I haven't experience any of that stuff.
hmm, wonder if S/X behave differently than 3/Y. Maybe Tesla thought the audio was less necessary since the flashing is in the front binnacle? I've def had the audio chime save me on a few occasions.