Thanks for your comment.
> I was wondering, as the background music is being mixed into a user’s audio input, does this mean that the background music for all participants is dependent on this particular user?
Yes. So, if the user who uses BGM hits the mute, BGM will stop in other participants, in this case.
> Can it be controlled on the server side instead
Oh… very interesting question. Normaly We can not. But I have some workaround to do this. But some additional inspection is needed.
very interesting.