Topic: Spectral Stereo?

[moondust.and.solitude]

In 2020/2021 the Beatles releases started being re-issued with "Spectral Stereo" ... and oddly enough they sound amazing. I've been trying to find out more concerning this process. Has anyone else listened to these and is there any pros on here that can explain the process? If you haven't heard these new releases, I assure you, it's more than something a weekend warrior using Audacity could accomplish 

[nassau73]

https://www.monotostereo.info/

The page also lists a number of tools. Audacity is on the list as having limited spectral capability.