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How to Disable the Boot Sound (or “Startup Chime”) on a Mac
https://www.howtogeek.com/260693/how-to-disable-the-boot-sound-or-startup-chime-on-a-mac/#:~:text=sudo%20nvram%20SystemAudioVolume%3D%22%20%22%20%28In%20the%20above%20command%2C,down%20right%20after%20you%20boot%20the%20Mac%20up.
Question: Q: How to reverse: sudo nvram SystemAudioVolume ...
https://discussions.apple.com/thread/6741774
Answer: A: Run the following: sudo nvram SystemAudioVolume=%26. (118856) More Less. Posted on Dec 25, 2014 11:40 AM. View answer in context.
terminal - Has Unix Parameter Name SystemAudioVolume Been ...
https://apple.stackexchange.com/questions/367502/has-unix-parameter-name-systemaudiovolume-been-changed-to-systemaudiovolume-db-i
Firstly, the sudo nvram SystemAudioVolume=%00 (or the same command with different values at end) never allowed users to actually change the startup chime sound. In earlier versions of Mac OS X it did allow users to change the volume, and therefore they could mute the startup chime, but this did not change the sound.. The closest thing to changing the sound is a …
How to Disable the Boot Sound (or “Startup Chime”) on a …
https://www.howtogeek.com/260693/how-to-disable-the-boot-sound-or-startup-chime-on-a-mac/
sudo nvram SystemAudioVolume=%01 sudo nvram SystemAudioVolume=%00 sudo nvram SystemAudioVolume=" "(In the above …
SystemAudioVolume not working in Yosemite · Issue …
https://github.com/mathiasbynens/dotfiles/issues/517
Disabling the startup chime has stopped working with Yosemite, I'm afraid. Or at least I can't make it work. Running sudo nvram SystemAudioVolume=" "works as expected since the new value is reflected in sudo nvram -p.However, upon reboot, the startup chime comes to greet me as usual.
What happened to the "SystemAudioVolume" after …
https://www.reddit.com/r/hackintosh/comments/rqu66a/what_happened_to_the_systemaudiovolume_after/
What happened to the "SystemAudioVolume" after Monterey OR OpenCore 0.7.5? DISCUSSION. So ever since updating to Monterey with OC 0.7.5 the SystemAudioVolume NVRAM variable is stuck at 30. It used to be 46 (max) and would scale down or up as I changed the volume so that the boot chime wouldn't wake everyone in the home up at night.
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