Hi
The way I understood it, Howe got the mono mix and extracted/separated tracks through a AI software, then rebalanced the mixes to his taste, editing-repitching-etc some tracks, duplicating a few bars here and there too (the intro to Why, for example).
I listened to it once, then put my LP copy for sale on Discogs :) (not my cup of tea, probably I like the original LP the way it is)
cheers
Doc