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Enable Mac Startup Chime

As has been widely reported, it looks like Catalina has brought back the the ability to enable the classic Mac startup chime. Personally I like the boot chime 😀

To enable:

$ sudo nvram StartupMute=%00

To revert back to default:

$ sudo nvram StartupMute=%01

Note that if you reset the NVRAM, you'll have to apply this setting again.
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