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

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-startup-chime-on-recent-macs/ https://eclecticlight.co/2020/02/22/how-to-enable-the-startu...