They seem to be completely unaware of American quadraphonics, or for that matter, the rest of the world, since with QS and CD-4 it would be pointed out that they are japanese systems. SQ,QS,CD-4, EV, and others. I so far have found no reference to them. Of course I haven't looked that long. They do know of Dolby matrix surround. However, I had read that there was a Russian matrix system during the time of quad, but I saw no mention of it either. Interesting.
The Quadfather