Been reading up the soundtrack versions and it's pretty complex!
Is this correct:
1. Original Theatrical 70mm 6-track mix
2. Original Theatrical 35mm Dolby Stereo - was also used for the early home video releases, VHS and laserdisc, but I think the VHS versions were a plain stereo "mono compatible" version and not matrixed stereo (even through Dolby Surround is supposed to be mono compatible anyway!).
3. Original monoaural mix - I assume this was used when the movies were shown on TV, which is where my recording originally came from
4. 1985 digitally remastered mix - used in subsequent home video releases, again the VHS versions were plain stereo.
5. 1993 THX-certified digitally remastered mix
I'd love to see a definitive list of differences between all of these!