I guess I don't understand why, if there's already a video preview, why doesn't the preview also carry the audio stream? It seems logical to me that the preview should have both audio and video.
Of course I can open the stream, but for that I'd have to be uploading and downloading to/from server at the same time and that seems silly if there's already a preview window.
Does OBS really not support the stream's audio in preview? Again, that just seems illogical to me.