I'm struggling with this every time I play a video in Lightroom.
I have an external (USB) audio hardware (Line6 UX2 to be specific, but that does not matter really) and even though every regular app plays through this interface, Lightroom keeps using the internal audio interface of my MacBook. Is there a way to set the audio interface for Lightroom or (optimally) have it use the interface set by the OS so that it correctly uses the USB interface and falls back to the internal one when the former is not available?
Premiere has the same issue but it's possible to change the interface in Preferences. There is no such option in Lightroom as far as I can tell.