I just pulled this out to give it a listen after many years. I'm not sure why I bought it but likely it was a recommendation from Fizzy as a stealth quad. As pointed out the cover does state "Quadroponosche Produktion".
While "Alpha Centauri" produced the best result even with "Atem" if you listen to the back channels only (Tate decoder) they are clearly separated and not just a phasy scramble. The recording itself is not something that I would normally listen to, it sounds like it would be a good backing for a sci-fi movie!