i finally added my library of films to my itunes movies. but i realised while doing the last one today, that while doing all the settings the way i wanted for the visual and subtitle side of things, i have overlooked Audio. i havent touched the bitrate of audio nor did i realise you could change the mixdown! i wanted to keep my films 5.1 surround sound as originally were, but iv been encoding these with the Dolby pro logic II mix down. does this mean i'v lost all the surround sound 5.1 mixes for the films? can i get them back in anyway?