I’ve been working on a restoration of sorts for the film Koyaanisqatsi; in my view, the “remastered” soundtrack they used is in many regards not up to par at all.
Through a few sources, such as the laserdisc PCM* and the original album release, that I consider to be the best quality, I’ve been able to put together a “restored” version that I think sounds much improved.
Official soundtrack mix: https://www.youtube.com/watch?v=eNNJrHR53ZA
Remastered soundtrack mix: https://youtu.be/q86RvSxAy04
This will be released in 5 channel and stereo mixes.
*The laser disc PCM will also be released as a preservation. I performed a complete restoration on it, removing clicks, pops, dropouts, line hum, and reduced hiss and noise.