SilverWook said:
I came across an interesting bit of history on Raider's original sound mix over at the LDDB forum, but I think you have to be registered there to be able to access it.
You mean this? http://forum.lddb.com/viewtopic.php?f=32&t=1296
"Raiders sound was mixed to be played in the VistaSonic Sound system that Paramount had previously used on Popeye and Dragonslayer. Unlike Dolby Stereo that used a matrix to encode 4 channels to 2 optical tracks, VistaSonic used 4 discrete optical tracks in the place of the normal 2. Since they were much smaller tracks, they were noisier, so a noise reduction system was used to improve fidelity. Stereo surrounds could also be employed by use of the SQ Quadraphonic matrix system - the stereo surrounds were encoded onto the Left and Right front channels with SQ - the discrete mono surround track then wasn't used. The playback head used a CCD based reader instead of a photodetector to keep the tracks and their phase response aligned better. The system was invented by Terry Beard who is also the inventor of the theatrical DTS system - while he owned NuOptix, a company that built much of the equipment used to record optical soundtracks, he also worked for Paramount's sound department as a technician in charge of research. There were many problems with VistaSonic during the Popeye and Dragonslayer showings (it had to be turned off during Popeye's premiere at the Chineese theater), so Raiders was switched to Dolby Stereo at the last minute - some minor remixing had to be done to accommodate the limitations of the Dolby logic decoding. The 70mm prints used the 4-track discrete VistaSonic mix unaltered except for the addition of Baby Boom subs. The DVD's 5.1 mix is the original VistaSonic mix so it's slightly different than the Dolby Stereo mix used on LaserDisc. The VistaSonic system was never used again - it had a nice logo though."
The plot thickens...