@Evgeni_Popov That make sense. At least the Chrome in my Apple desktop still works! (Hopefully still)
There are more issues as well. The Dynamic textures started failing in my product yesterday on iOs 14 . Switching to rawtexture saved us though.
For some reason, the buffer of the soundsource is null…I keep digging 
The good news is you can play .mp3 with Safari (at least on MacOS).
The issue appears here : Babylon.js/audioEngine.ts at 1d60be346cf68274e5dd22ee91cdadb5e8b2949f · BabylonJS/Babylon.js · GitHub
Where the check is false and isMP3supported never gets true.
If I force it to be true, the sound can be heard.
@Cedric What do I have to do to test this on my app’s client code?
The caps checking was not working, so I 've added another way to check
You can checkout out this branch and build bjs, or wait for the next nightly
@Cedric Cool! Do you mind rephrase in layman terms what you said? 
I think it is:
wait for the next nightly
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Can I just ask please - which version of babylon did this fix go into? Working with 4.2 at the moment, and hitting this issue.
The fix is part of the 4.2 release.