I am in trouble. Just finished the first track, and I have to jump on the forum. I've been casting a lot of 9 and 10 recently. SO I don't know what to say, this is another level of quad mixing. One track is enough to understand. Many quad mixing end up being one stereo plan front, one stereo plan, rear. From the beginning the drum is stereo center (I mean equally represented in stereo front and stereo rear), brass are boldly confined to rear left, strings to rear right... Guitar is front center, with its reverb being stereo rear...
You get far more space than 2 stereo plans. This is what quad mixing should be, bold, diverse and assertive.
This is where my trouble lies. 10 seems small to me in regards of others 10 and 9 I voted.
[edit 1] another fine exemple in Spirit of Summer : strings are stereo front (as are the keys), brass is again rear left, but its reverb is rear right, with a small predelay setup. That ends feeling your head is into the brass yet the slightly delayed reverb maintain a sense of space without making the close scrutiny on brass claustrophobic. You get a low level perc in the rear right, but within its own (different) reverb. Interesting treatment of solo guitar that moves from slight left front to ull left front panning, like it was recorded with an hexaphonic pick up and that each string had its own panning.
Did I say I was enthousiastic ? This is lesson to me.
[edit 2] One may be suprised the rule of having an instrument and its reverb on the same channel is broken here. Really it was always a stupid rule, and it is a dated stupid rule. I'm glad when the quad mix was done, the person in charge was more adventurous.