Ok here's my story. I bought a cd labeled "Quad Mix" on cd of Jeff Beck Wired. I have this recording on SQ disc and Q8. The mixes are exactly the same, adn on top of that, there are a few differences from the stereo mix. I got the cd and it does decode into SQ as far as rear info, but it is not the same as the CBS mix, and the programming defferences in the SQ from the stereo mix are absent. In other words, it sounds like the stereo version, with some phase messing to get it to go to the rears in SQ. I have sent some very nice emails to the seller to try for info on this and have heard deafening silence. A while later on ebay I saw a cd advertised as the "Quad Mix" of Stormbringer by Deep Purple. Now this is too much as of course, this was released only in Q8 and cd4. So I email the seller again to try to get some info. Guess what? No response. Basically, I don't think adny of this crud on cd is worth bidding on. From now on, I'll stick with vinyl.
Marc
Marc