Re:Mac Chimes of Death
by chipotle_coyote on Friday April 16, 2021 @03:45AM
(#26830807)
Well, it's there now. :) Notice that article says "With macOS Big Sur 11 or later..."; that checkbox they show for the startup sound isn't available in earlier versions.
There is, however, a hidden "StartupMute" preference. If StartupMute is enabled, the chime is turned off, and vice-versa.
sudo nvram StartupMute=%00 # turn on the startup chime
sudo nvram StartupMute=%01 # turn off the startup chime
https://eclecticlight.co/2020/02/22/how-to-enable-the-startu...
https://support.apple.com/en-us/HT211996