Hi Russ,
I'm not an expert by any means, and my old ears (67 yrs) are far from golden, so this is not the reveiw you're looking for, but I thought I'd chime in anyway.

I've listened in my cans a couple of times and also on my "big" system. (Event TR8s and KRK sub). I also panned it to mono in both, as well as stereo. As far as I'm concerned, this is excellent in every way except perhaps the panning in stereo.
In mono, it sums really well. I can hear all the instruments at levels that work well for this tune and I wouldn't touch a thing. In stereo, it still sounds great, but I'm not hearing much spread at all.( intentional?).
Is this all midi? (That's the way I'm hearing it anyway) If so, all the instruments sound convincing.
All this needs is a little get together, toss this on the speakers and sing along karaoke style. lol
I'd come if I didn't live so far away.
Later,
Jim