Yup and not just other sounds, musical cues too, you cant remove them without destroying some of the existing sound that accompanies it, which means you'll kill pieces of the orig dialouge. Editing sound isn't like modifying art in Photoshop, there are no layers, just wavelengths.
For example, I have a scene in my edit I'm working on that I have to rebuild sound wise all the way from the ground up and its hard, really freaking hard. If I hadn't spent so many years in school taking classes on how to do it I would prob have given up by now, I couldn't imagine trying to rebuild the SFX for an ENTIRE Star Wars film.
And thats assuming you could isolate the center channel in a clean mix, which is hardly ever the case. There's so many little things going on in a mix, from echoes, to ambient sounds,... like take a blaster for example, that blaster could go off in the RS channel, move to the L Channel then end in Center . So Say you delete the RS and L channel, you still need to eliminate the Center part and say that part is mixed in during alot of talking...
yeah... then when you have do that to an entire film, you then have to REBUILD the L and RS channels from scratch without having all the orig ILM elements. SO you then have to grab from game files or god knows what...
Sorry I'm calling huge shenanigans on this one... editing a film is one thing, color correcting, add/changing mattes are another. But the soundmix you cannot mess with, you either cut it, clean it, or rebuild it. Removing sound-fx and music from a 5.1 mix just cannot be done I've come to believe this post is alot of talk and wishful thinking.