Hi Cameron!
 I appreciated the CD-4 format, the only real quadraphonic format out there I 
appreciated the CD-4 format, the only real quadraphonic format out there
for records. I attended a seminar at BYU in 1972 which was largely about 
quadraphonic formats, and it was mostly a group of Japanese engineers 
fighting over the Sansui QS system, the Columbia SQ system, Ev-4 and such. 
All of which sounded like glorified mono to me with only a few dB of 
seperation and either a hole on the sides or at the rear.
I was a fan of discrete quad tape at that time since that was what the 
electronic music community was using as a standard, and just before leaving 
Seattle in 1970, I had the chance to do a little work in octophonic sound 
using a friends Scully 1"-8  track machine and an array of RE-15 EV 
microphones. The placement was in each corner, low and high to get the right 
speaker placement. It was tremendous. We used Altec A7s as the speaker 
cabinets for the playback. I've never heard anything to equal that 3D sound 
since.
Now with the digital decks being so cheap with 8 tracks.. ala Alesis ADAT, 
Tascam DA-38/88, Fostex, SONY, etc., perhaps some more experimentation in 
this format may be worthwhile and even feasible now. It wasn't at the time I 
fiddled with it, since only a few had stereo and only rarely was quad even 
being considered at that point. Another setup that worked out well, and again 
didn't have much time to really reseach it was a 6 channel format, but due to 
the way rooms are normally built, it wasn't very practical using a low 
channel and a high channel with 4 mid level channels (height wise).
Running out of time on this BBS.. and BBS operators are wondering why the 
mass exodus to Internet! So more on this later if there is any interest!
 Bonnie *:>
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