DVD Downmixing 2010-09-20 21:03:06 I popped "The Fellowship of the Ring" Extended Edition in my Macbook Pro the other day, and noticed I had the choice between Dolby Digital 5.1 and "Dolby Surround". Am I safe in assuming that the Dolby Digital is down-mixed to Dolby Pro Logic II on my Mac? And if so, what at the advantages/disadvantages of this down-mix vs. the special made "Dolby Surround" track? I'm wondering why the included a "Dolby Surround" track at all? I guess I should mention I'm just listening via analog headphones.Thanks much!