After Downgrading from Big Rum-to-Catalina, The Boot Chime Still Resides

How do I Fix this in my MacOS 10.15:
Boot Chime after downgrading from Big Rum to Catalina. Any Terminal Commands or AppleScript to Fix this?

Downgrading From Big Rum Gives a A Boot Chime
I have used the macOS X 10.16 Beta install. Prior to installing the beta, I backed up my macOS Catalina with TMB. Having come across issues with its interoperability with currently installed software at the time, I restored to to my macOS Catalina TMB.

A Boot Chime for Catalina:
Thing is, having restored to the macOS Catalina TMB I created, mysteriously, the Boot Chime resides. It boots into Catalina, thought that is not intended. When I erased my hard drive, the Boot Chime was still there upon boot even. So, something is up.

Should the Boot Chime Still Reside?:
When I shut down the Mac, and then boot it back up again, then percentage is the same as it was when I rebooted. So, at Shut Down, with the volume at 65%, it Boots Up at 65%. The same for 100% and for 0%.

Feedback Assistant:
I reported this software's interoperability issue to Apple using the Feedback Assistant. I got word back it was fixed for Catalina - with no more errors popping up. And no more error messages regarding the software's interoperability issues with Big Rum a popping up.


So, 3 Main Questions:
  • Why the Chime?

  • Should it be there?

  • How do I rid of it?

I would expect it to go away, yet it still has not.
Have you reset your NVRAM? I believe the option to chime or not is stored there.

If a reset still keeps the chime, then you'll need to set it manually:

Code Block
sudo nvram StartupMute=%01



After Downgrading from Big Rum-to-Catalina, The Boot Chime Still Resides
 
 
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