Would appreciate someone clarifying this for me: Are All Blu-Ray Discs in Tru Audio or not? It seems a lot of my Blu-Ray rentals lately just say 5.1/6.1 Audio not Tru Audio. Does this mean they are not in Tru Audio?

Also related to this, if a Disc is in Tru Audio or 5.1 sound, will it automatically if I don't go into the discs setup play in TruAudio or 5.1 sound whatever is the highest quality audio option or should I always click in the blu ray disc set up menu. I ask this because at times its a pain in the ass to use setup menus and I'd like to avoid if I can. Thanks for your answers.