Took me loading up wow to see what it says on the options there ..
C_VoiceChat.SetOutputDevice(deviceID) is linked to the code that displays the Voice Chat Output Device option with deviceID being a string
However, looking at the Audio file itself (
https://github.com/Gethe/wow-ui-sour...ions/Audio.lua ) it doesn't look like there is a SetOutputDevice function for game audio in general.