(This review is for the Reactive/Esoteric 2011 remastered edition)
As other reviewers have noted, the provenance of this Tangerine Dream album is rather confusing. When released in 1986 by the 'Jive Electro' label, it was marketed as being a 'lost recording' made by Froese & Franke in 1973, between the classic Atem and Phaedra albums. However, the audio quality and sound palette bear little resemblance to the murky spacey production techniques the band were using back then: it is a clean clear recording, and has quite a few synth and drum sounds on it which appear on contemporary early 80s T.Dream/Froese albums such as 'Pinnacles' and 'Hyperborea'. As such, I would strongly suspect that a lot of what we were hearing was newly dubbed on and mixed onto an old tape from '73, and there's very little of the original sound left!
However, that's academic, really: taking the music on its own terms, I find a lot to like about it. The four tracks are sparse, minimal, languid, and considerably less twee and 'muzaky' than some other early 80s Dream material. Chris Franke's acoustic drum kit playing is also nicely tight and judicious. The music doesn't try to hard or over-complicate itself.
I also own a copy of the original 1986 CD, so I ripped WAVs of it and this new remaster, and did an A/B comparison of them in an audio editor on my computer. The change is quite radical, probably the biggest sonic alteration I've yet heard on any of these Esoteric re-issues. The new edition is significantly louder and has a much much fuller sound, top, bottom and mid: the whole thing really has been given a dose of sonic steroids. The 80s CD sounds muffled and anaemic in comparison.