To answer the first post, yes- I can confirm the ESCAPE FROM NEW YORK Bluray (released in the States by Fox) also has a 2 channel mix that **is** the original Dolby Stereo mix. ESCAPE FROM NEW YORK, while being an MGM title, is thankfully released in the States by Fox. Correct music cues, effects, directional moments, etc are intact on the 2nd Dolby Digital 2.0 English track. If MGM had released it on home video via Bluray, the original track would be missing.
The same goes for virtually all Warner Brothers releases. If the soundtrack is remixed, one can almost be assured the original, be it mono or multi-track, is now out. BEN HUR won an academy award for its audio mix. So where is the original 1959 multi-channel mix? Ditched in favor of an all new 5.1 mix, fresh with all new surrounds and added sound effects. The old laserdiscs used the original mix, with the only downside being it was a Dolby Surround mixdown.
Fox region 1 releases are to be commended for (almost) always retaining original mixes. The latest PREDATOR Bluray release had some altered dialog (forget the exact spot in the movie) but they also included the original mix via a Dolby Digital 4.0 discrete track. The Star-Wars releases, of course were exempt to this general Fox policy, as Lucasfilms had full control over those releases. Vintage Scope and 70mm Fox bluray and DVD releases will sometimes have new 5.1 tracks. On occasion these remixes may center any dialog that was originally directional in nature (ie: tracked the action on screen). Sometimes the directional audio is retained, but slightly pulled in to better match the smaller TV displays. Again, thankfully most Fox releases retain a 4.0 mix.
Of personal interest to me are the two upcoming SENSURROUND titles due to be released on bluray this year: BATTLESTAR GALACTICA (1978 version) and EARTHQUAKE. For the last DVD version of Earthquake, Universal decided to do a new sub-par 5.1 remix, but included an optional 3.1 track "original Sensurround mix" which was not the original 3 track stereo mix, and the LFE channel didn't even utilize the original cue tones to trigger the original Sensurround generator. The LFE track on that track is undecoded junk. Nothing at all like the original mix which shook plaster from theater ceilings. When Battlestar Galactica was released in theaters, Sensurround had been modified to run from an optical track, with the sensurround portion DBX encoded. And for Battlestar, there were also tones to make the LFE effects directional in nature for those theaters so equipped. http://en.wikipedia.org/wiki/Sensurround I was able to hear Battlestar with Sensurround Type III decoding during its original run, and the directional bass cues were very apparent & effective.
When Universal released Battlestar (and Midway & Rollercoaster) they went with the rarely used Dolby 1.1 format (center channel plus LFE) which is correct. Problem is - for all three titles, the DBX type II noise reduction for the LFE tracks was never decoded. And the LFE levels are horribly low. As for the original directional bass cues? - Gone. Given new bluray releases are around the corner, I would love to see this brief audio format finally presented properly. But I'm not holding my breath.
A few people have asked about CLOSE ENCOUNTERS OF THE THIRD KIND, and based on my brief spot checking against an old beta hi-fi release, the mix essentially sounds the same. With that said, it sounds like on occasion they have taken the original surround track and steered to surround left or right when called for, or applied some decorrelation here or there. In short: Still very respectful to the original 70mm mix.
I've heard 2nd hand the first six STAR TREK movies on laserdisc used the 35mm mixes, while the DVDs (sans the 1st feature, which was a completly remixed directors cut) were culled from the 70mm mixes. Cannot confirm for sure, nor do I know if the 70mm mixes were used for the blurays. I can confirm Star-trek VI was one of the first movies to be tested in Dolby Digital for its theatrical run, and it does have split surround activity.
I'll wrap up with a few random titles (some that I've heard 2nd hand) have been altered, with *no* original mix included:
SUPERMAN (as most know - new effects were added, and while an "original 2.0 Surround track" was added to the DVD release, phase issues screw up the decoding. Get the LD for the best original 35mm audio mix. The 70mm mix, which was the first ever Dolby NR encoded mix with split surrounds, has never been released on any video format. While working on the DVD version, Donner found a 70mm print with split surrounds, and listened to it briefly along with the 35mm mix before opting for a remix)
TERMINATOR (as most know - new effects were added, music cues were screwed up)
CONAN THE BARBARIAN (the bluray's 5.1 remix of the original mono is a mess)
GHOSTBUSTERS
XANADU (1st DVD was original 4.0 mix, 2nd release new botched 5.1 mix)
SUSPIRIA
JURASSIC PARK (original 5.1 DTS theatrical mix ditched in favor of a 7.1 remix, some music and effect levels altered in the process)
TERMINATOR 2
HIGHLANDER (region 1) Movie was remixed in the 1990's. The AC3 LD also has the remix. At least one EU bluray has the original mix as an option.
FANTASIA (original directional Fantasound mix ditched in favor of a new remix)
GREASE
FLASH GORDON (region 1 DVD took the original wide 3 front channels and leaked them into the surrounds for a busier more active surround track. Not sure what mix is on the new Bluray)
There of course are many many more examples, but this is off the top of my head. If someone wanted to compile a master list, that would be awesome.