Jaybird, First and foremost THANK YOU for taking the time to forward those tracks. I have been looking through them since you forwarded them earlier today. I have some quick observations to pass along, although I expect to dive a little deeper when I have more time.
1) Gloria Gaynor - It ;definitely behaves like QS. A quick decode puts Gloria and the band in the front channels, while the strings and the horns are in the backs. One observation, this doesn't seem to be the track that had the vocals get quiet over the radio, as summing the track to mono has the vocal nice and loud, while the strings cancel out.
2) Tommy soundtrack tracks. These are much less blatantly encoded, almost to the point that I question the encoding. If these tracks are encoded, they are pretty disappointing. I had to go back and check my notes to make sure I was decoding properly, and also dug out some other QS encoded tracks to compare with. Just for the sake of argument, I compared a couple of tracks from the orchestral Tommy recording which is known to be QS, and also compared it with a QS demo track and a Joe Walsh/Barnstorm QS track. All of these other tracks showed much more blatant rear channel information, while the Tommy movie tracks by comparison sounded kind of blah and unexciting. KInd of mono sounding and not too distinct.
So , I'm not saying it's not QS, but if it is , it's disappointing. The orchestral version is much better as far as the 4 channel split is goes. , and nowhere near as "active" as the audio from the DVD. If there were any retail demo discs that might have had the Tina Turner "Acid Queen" track on it I would love to see if it's a different mix made especially for demonstration, as the version I have does not sound all that remarkable.
One thing I've noticed with the soundtrack audio is that there doesn't seem to be much of any audio content at 180 degrees, which is usually the case with QS. Once again, I'm not saying it's not QS, but it just seems odd that there isn't more of that in the tracks. All the other QS audio I had to play around with had a significant amount of this. Typically SQ and QS encoded material has phase information that is pretty "organized" typically, while the tommy soundtrack audio has phase information that seems more random. Usually, it is my understanding that the exceptions to this are when you have material that was recorded "au naturale" without pan pots involved, which is not the case here.
In any case, all I can tell you is what I have found so far, and seeing as I am more of an enthusiast than a bonafide expert, I wouldn't attempt to draw any conclusions. Once again, thank you for getting those tracks to me, as I love excuses to play around with music on the computer.