Darth Editous said:
If you're working with the 5.1 mix, the vocals are mainly in the center channel, but (IIRC) there is usually a bit of leakage to the left and right channels.
One exception to this (at least) are Temuera Morrison's inserted lines in ESB - they are solely in the center channel, unlike Vader's lines in the same scenes.
DE
So would that mean that his lines would be easy to remove and replace with the original voice?