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The famous "Tri-tone" notification sound is used by Notification Center in macOS 10.13. It can be found here: /System/Library/PrivateFrameworks/ToneLibrary.framework/Versions/A/Resources/AlertTones/sms-received1.caf

Traditionally one can override system audio sounds by placing a new audio file with the old name in $HOME/Library/Sounds, however this does not appear to work for this sound. For example, supposedly a new sound effect with the name of basso.aiff can be placed in ~/Library/Sounds/ to override that sound. It appears that macOS 10.13 detects custom sounds and offers 2 "Basso" sound effects now, however extending the same logic to replace sms-received1.caf with a new sound does not actually work. All sounds still use the original sms-received1.caf and not a new one in ~/Library/Sounds.

How does one go about changing this Notification Center alert sound without replacing the actual file at /System/Library/PrivateFrameworks/ToneLibrary.framework/Versions/A/Resources/AlertTones/sms-received1.caf?

  • This still appears to be almost a duplicate of apple.stackexchange.com/questions/210072/… The answer has always been 'you can't' you have to sacrifice one for the other, unfortunately. It would be nice if someone found a new method for HS or Mojave... but I don't hold much hope. – Tetsujin Jul 17 '18 at 18:51

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