OK checked out the the Chace audio mix of T1 thanks to Mr. B!

It's clearly a totally different mix from the mono mix AND the ulterior 5.1 remix.

The voices are placed way clearer than on the original mono, and for example in the police precinct massacre scene, you can hear everything the cops scream in the background and understand all the words they are saying.

I think they took the stems and repurposed them to try to make for a better mix. It sounds artificial in some instances. Stems are for example: Voices / Sounds Effects / Music / Foley.

it has a stereo feel but sounds like the original mix, only in stereo. It's not as finished as the original mono track, but it still is very interesting to hear as an alternate mix.

It's an awesome find.

Now all we need is to sync it and pitch it back to the current Blu-ray master ;)