MG 2.0 Default unmute Facebook embeds?

The MG uses the standard BB code media site system embed code for things like this. This then uses the FB embed system and I don't see any documented options surrounding unmuting by default.
 
It must have been for an older version of the code, I did try that last night - and have tried it again but it didn't work.

I don't know if this sheds any light on things? I know there's no such file for XenForo, but is it still relevant?
 
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