As a small interesting piece, a person who signed off (who signed the arrival of it to the record company and was eventually a responsible "editor") on one of the topoxforddoc’s reels of tape has a story to tell...
"Despot attended recording sessions of The Beatles’ Sgt. Pepper’s Lonely Hearts Club Band (London, 1967), Rolling Stones’ Let It Bleed (London, 1969), Pink Floyd’s Ummagumma (London, 1969) and Arsen Dedić’s Homo volans (Zagreb, 1973)."