msycamore said:
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"But there are more obvious examples, probably the most noteable of which is that Aunt Beru is voiced by a completely different person (neither the stereo nor mono version is actress Shelah Fraser)"
Is this correct? As I recall, ADR was done with Shelagh Fraser for the film.
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No concrete source, but I reckon that both the mono and the Dolby mixes are Fraser, but different takes from the ADR session.
http://originaltrilogy.com/forum/topic.cfm/Berus-voice/post/472283/