I've noticed this phenomenon, too. What's the dilly?
I'm no technical wizard, and certainly not very knowledgeable on the production side of things, but it would seem to me that if you've got an original multichannel mix in a can somewhere, then when the time comes to release a DVD, it would only be natural to go back to the source...
Saves the work of generating a pseudo-multi-channel mix like Pro Logic or creating a new 5.1 mix... and yet it allows you to offer the added selling-point of an "(almost) never-before-heard" version -- why not stick it on the DVD along with the stereo or Pro Logic mix?
(I can see hardcore fans of many bands of this vintage getting quite excited about finally being able to see their band's mid-70s theatrical release as it was seen only for those few lucky fans who got to see it in a suitably equipped theatre.)
I mean, if they're passing that terrible SQ mix of Abraxas off as a 5.1 multichannel mix, then surely they could use a quad mix for a concert movie... couldn't be much worse than the SQ Abraxas, and the DVD format can always allow users to choose their mix.
I guess there's also the possibility that the 4 channel tapes have since degraded or been lost (they may have suffered neglect in the 80s, deemed "relics" before the resurgence of multichannel audio)... or perhaps it's simply that the people doing the new mixes don't know/care enough to make good use of the old multi-channel material.
Indeed I am, sir! Can't exactly say I'm "in" with the band or management, but I have hung out with the band post-show on a couple of occasions (in fact, shared (more than a few) drinks with Chris and Alan a couple years back). They are indeed close with / responsive to their fans...
I will definitely raise this with them should our paths cross again. Seems Steve Howe is the de facto curator of their archival material (he was the source for all the extra tracks on the recent Rhino re-issues as well as for the potentially upcoming live box), so I guess he'd be the one to talk to, but he's also the most "elusive," shall we say... a rather private man.
Regardless, I for one would love to see and hear the original quad Yessongs, along with Song Remains The Same, for that matter.
"Tour dates? But these are tomorrow...tomorrow...tomorrow...tomorrow..."
[
-- apply unheard quad effect here -
@: ]