You're in luck as Belbucus recently captured and synced a bunch of different audio tracks to the GOUT. You need to add a 1.017 second delay or something like that but yeah, there are multiple audio tracks available in FLAC format to mux with the GOUT. Have a look around in this forum and the Star Wars Preservation one to find the thread (sorry, I'm too tired from work to track it down for you).