I see what you're saying, and you're right that the 70mm mix is largely uncertain. Until an actual 70mm print surfaces (ha!) all we have are fuzzy memories and stray facts. However, I believe it to be very close to the 35mm Dolby mix.
We do know that the 70mm mix was created first, followed by the 35mm Dolby Stereo mix. These two mixes were prepared for opening day, May 25, 1977. Since they were created nearly side-by-side, I would think they would be nearly identical in terms of content. The mono mix was created a bit later, going into circulation in June of 1977. We also know from interviews that many changes were made to it--and we have the bootleg to confirm that.
A release date for the Story of Star Wars album would be helpful. I would guess it would have been summer 1977.
Originally posted by: THX
IIRC, the 70mm (6-track) mix and the 35mm stereo mix were both made from the same 4-track master and are therefore pretty similar to each other. I also recall reading that the LP was made from the mono mix, with some stereo effects added.
IIRC, the 70mm (6-track) mix and the 35mm stereo mix were both made from the same 4-track master and are therefore pretty similar to each other. I also recall reading that the LP was made from the mono mix, with some stereo effects added.
I believe that is correct, and it would confirm that the 70mm 6-track and 35mm Dolby Stereo mixes would be nearly identical.