I've been hearing this unfamiliar "alert" sound – kind of like a badly played guitar string slapping against the frets. After the sound occurs I don't see any new badges or any other indications that something happened…
I've been though all of the stock sounds in System Preferences > Sounds > Sound Effects and while Basso sounds close (hard to say for sure since I can't make the sound happen on demand) I don't think it is the one.
So the question, in three parts:
- Is there any way to identify the source of alerts?
- If I knew the name of the sound, would that help? (Should I / could I go looking for places where Basso is used?
- Can "non-stock" sounds be used for alerts?
I'm running the 10.12.3 beta on a Mid-2014 MBP.