Hi fizzywiggs
I'm not saying you are wrong, but do you have a source for this?
LISZTOMANIA (1975) is generally credited with being the first film in Dolby Stereo (3 channels, R - C - L), followed by A Star Is Born (1976) (4 channels R - C- L & rear surround):
http://www.guinnessworldrecords.com/world-records/first-film-released-in-dolby-stereo
https://books.google.com.au/books?i...h35OQO2#v=onepage&q=LISZTOMANIA dolby&f=false
Star Wars is credited as the first film to use 6 track Dolby Stereo: http://www.in70mm.com/newsletter/2000/62/dolby/
I have some notes on Mosely's Kintek sound system, but alas not all.I do remember reading in one of his (and there are many) Quinta phonic
publications, where he credits TOMMY and LIZSTOMANIA.The singular one I have credits his initial work with TOMMY.
I took the liberty to google "Kintek", "Quintaphonic","Mosely", Colourtek", and there are a number of pdf files available in relation to early Matrix encoding.Perhaps one of these can identify all of Sansui's QS encode usage in 75-76.
That being said anyone with back copies of Jay Frank's "4 Quad" monthly reports on quad releases/developments and also copies of Larry Clifton's "Quad Quarterly/Quadlings/MCS Review did indeed cover early use of Sansui QS encode for a small number of film soundtracks.
Although I do not have proof of one other source (namely Dolby Labs), I seem to remember Dolby's Roger Dressler indicate that QS was used but only very briefly by them prior to the use of SQ and of course the latter MP matrix.I had communicated with him via telephone at least a couple of times specifically regarding their encoding history.