Hi guys! i'm sad cause i only found this forum today! damn it!!!
anyway, greetings to all the community!

It's widely speculated the 5.1 tracks starting from the DVDs (as well as the Atmos) are ground up remixes from the M/D/E and soundtrack stems. 

One widely known change for BTTF is the scene where Doc is testing out the DeLorean and shouts out "You did it!". On the older TV prints, Dolby Stereo and (possibly) 70mm six-track, Doc's shouting has more energy and sounds severely distorted. The 5.1/Atmos has a redubbed take that is much softer in delivery and was probably recorded around the time of the DVD release as the mic audio quality drastically different. 

One report on the Blu site said the 5.1/Atmos for II has several SFX changes ranging from gunshots and other ambient sounds. The Atmos in particular is believed to use a censored TV line (no doubt by mistake) for the scene where Future Biff is shooting at Marty and yells out "Snot nosed punk!" instead of "Son of a Bitch!".

It's known that the LDs have the Dolby Stereo and some of these have been preserved, but did any other releases outside theatrical runs contain the 70mm six-track mixes?  

There's another rumor that some streaming/digital versions have a 2.0 track that is only accessible when the equipment is set to output stereo only. I rented BBTF on the now defunct AMC On-Demand service some time back and it used the old HD master but had what I believed was the Dolby Stereo mix, as it contained Doc's distorted line and different SFX compared to the 5.1/Atmos. Other places like Prime Video and Netflix had obvious downfolds of the remixes.

I'm not entirely sure if such titles like these just have downmix compatibility tracks or the original DS. It also depends on the retailer and which master they have. I know this is a real thing and I'm not going crazy because when Broken Arrow was on Starz Amazon Prime Channel and I played it on my ATV 4k set to multi-channel/original, it was the 5.1 mix. On my Win 10 PC (with stereo output only) and through Chrome browser, it played what sounded like the Dolby Stereo mix.

Hello there
A humble request for the Movie - East of Eden 1955 - https://www.imdb.com/title/tt0048028/
If possible I could get the OG audio from LaserDisc / DVD / VHS, this can be Out of sync. Will manually sync it myself

LDDB - https://www.lddb.com/laserdisc/09111/12579/East-of-Eden / or other(s).

Regards

Hello there!

I am looking for a personal project Halloween (1978) Criterion Laserdisc. I would also like to get the monkey track synchronized by spoRv for BluRay. This would be ideal, but it is worth alone with the mono track, be the synchronization of spoRv or the original laserdisc.

Thanks!!

HKL DVD Commentary synced to the New Arrow UHD
Commentary by Bruce Lee expert Bey Logan (HKL DVD)

PM for links

Source WAC DVD NTSC
Synced to UHD
Input: AC3
Output: AC3
https://slow.pics/c/uKuXzMwn
Syncing done via eac3to -edit

PM For links

Kudos to everyone involved in the creation of such a rich and communal forum. I look forward to engaging with all the hard work created here.

Thanks!

Hello, just found out about this lovely community. Looking forward to interacting with you all. 

Since Kino just released the UHD, anyone has the original Stereo track ?

I'm a film nut like everyone else here and interested in finding out about preservations of my favorite movies!