Sometimes it seems like my DVD player "remembers" settings like that when I play music DVDs, between stereo and 5.1 at least. It'll stick with the choice I made the first time I put the disc in. Even if I remove the disc it'll default to the mode I chose before. Well, sometimes it does and sometimes it doesn't. I think it tries to recognize the disc. I don't seem to have any trouble switching over to the other version by going back to the main menu though.