Finally heard the original Quad mix (DTS conversion from the SACD) today and:
1. I like it much better than the DVD-A 5.1 mix -- it's drier and thus more faithful to the MH I know and love.
2. The bonus 'Lazy' and 'Maybe I'm A Leo' are definitely from the DVD-A mixes. They're 5.1 (center channel is active) with same added 'verb, same instrument placement. (the DVD-A .ac3 is quite a bit louder though)
3. BUT: on the quad, there is about 12 sec of music missing from the final guitar solo in 'Lazy'! One of my favorite licks too. Verified by comparing the lengths -- it's 7:06 on the quad and 7:22 on the 'alternate mix' (which is the DVD-A 5.1 mix) . The missing section on the shorter version is 6:08 to 6:22 on the longer version. Is this a bug or a feature??