The Nerd said:

The source is the widescreen DVDs, i don't think the aspect ratio has anything to do with the sound. But I was able to remove all the sound effects during for my ROTS complete score during the It Can't Be cue scene, where we see part of mustafar and then Anakin crying. Part of the cue that you hear in the scene is unreleased while most is heard on the track Anakin's Dark Deeds.

What, that doesn't make any sense to me. The DVD's have a mix like that? If it's really like that than post some videos on Vimeo.