There were two different reels in 1977, a mono reel and a stereo reel. The mono reel had the same sound sent to all of the speakers in the room. The stereo sent the left track to the left of the room, and the right track to the right of the room. These tracks were different. The mono version is only available on the rare 16mm reel from 1977. The stereo track is available on all Betamax, VHS, Videodisc (CED,) and Laserdisc copies from 1982 and 1983. The Laserdisc track came out in 1993, and is the stereo with mono bits mixed in. It’s on the Definitive Laserdiscs, the 1995 “last chance to own the original” releases, and the 2006 bonus discs. There was another track in 1984, and it was all copies made from 1984 to 1992. Then the Definitive track took over. If you want the mono track, look for Puggo JarJar’s Yoda on the forum. He did a preservation of the 16mm reel.