Apart from 70mm and mono mix material, the 1993 mix for ANH was supposed to have some additional sounds. I think I read somewhere that they came from the mixes for original foreign language releases. Is this true? Did all of the additional material come from such sources? Can anybody provide any further info on this?
That's what one of the guys at THX (I forget his name) told Widescreen Review when the Definitive Collection laserdiscs first came out. Whether it's completely true I'm not sure. (They're not on the French and Spanish tracks on the GOUT, which most resemble the mono mix.) They could be from some obscure foreign version, or maybe Ben Burtt invented some of them in 1993, who knows.
Here are the two threads on this topic:
http://originaltrilogy.com/forum/topic.cfm/70mm-mix-to-93-mix-comparison/topic/6501/
http://originaltrilogy.com/forum/topic.cfm/DC-amp-Faces-Original-audio-sources/topic/5739/
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Thanks. :)