This is truly one of the great soundtracks. Composer Wendy Carlos explains on her Website (an excellent site, BTW) why some of the recordings (soundtrack and otherwise) of the early to mid-80's may not be able to be heard again. It could be the answer to the Dark Crystal, and Black Hole OSTs not being released on CD.
"--Ampex introduced another even higher output oxide, with a newly formulated binder as well, that exacted a deadly curse upon all who used it. Of course it wasn't realized at first, it took a few years. The new binder was no longer the stable, inert formulation it had been. The supplier of the new batches had inadvertently allowed many short molecules, much shorter than before, to dominate the mix. These are very hygroscopic molecules, which simply means they absorb water readily, right out of the air.
The water causes a change in the state of the binder -- it becomes a semi-liquid, and migrates from behind and in between the oxide particles, gluing them together and to the backing, up to the front oxide surface, where in its softened state it acts as a pretty effective glue, sticking to heads, guides, leader tape, fingers, rat hairs and floor sweeping... all the things you don't want attached to your magnetic tape surfaces, which ought be smooth, dry, clean, and slippery!"
Her TRON and Shining analog masters (on 3M tapes, who decided to use the same kind of oxide/binder formulation) were basically turning into strapping tape (she had digital mixes, "perfectly playable" according to her) but without these analog masters, it would be pretty hard to do new Dolby Surround mixes. Hence, the solution offered by one of the writers at EQ magazine; bake the tapes to dry them out, then back them up to new stock.
Wendy did, and since it is TRONs 20th anniversary, Disney decided to commission a new CD of the soundtrack. Thank God!