Hi. I’m in the UK (region 2) and both my DVD and Blu-Ray of ep II have the soundtrack in multiple channels, including the one with vocals. I know that on some DVDs and Blu-Rays, the channel with the vocals (the centre channel) is completely soundtrack-free.

Can this differ between different region codes of the same film? Sometimes US films are re-edited for UK release, so it seems likely that the way the soundtrack works on a technical level could be different.

I have watched fan edits of other films that presumably used a region 1 source, which have a completely new soundtrack without any audio distortion/quality loss when the characters speak, presumably because the soundtrack was not in the centre channel so they didn’t have to use “background noise removers”.

My region 2 copy of the same film, however, does have the soundtrack in the centre channel.

Has anyone replaced the soundtrack in episode II or another one of the prequels from a region 1 disc? Does the centre channel have the soundtrack in it?