Always looking forward to more of these quads, EARLY QUAD 60's wonders that recieved a mix and got shelved.
I know we can rely on those people involved to do their very best to continue to surprise us.
I'd wager there's quite a few from the 8-track era we never saw. I get the impression that Columbia tried to avoid using 8-track multitracks as much as possible. Most of the commercially available mixes are 16 track or better with the occasional 8-track song mixed in. Prime examples are some Blood, Sweat & Tears albums (BST II, Greatest Hits) and Sly & The Family Stone Greatest hits which all seem to be blends of 8 and 16 track masters.
Some of the unreleased Quads we've seen all stem from 8-track : Big Brother/Holding Co. , Child is Father to the Man, Johnny Winter Self-titled, Raiders/Hard & Heavy, Laura Nyro/Eli, Bookends, and so forth.
I have no idea if this edict was real, it just seems to me that while RCA went back into the archives using 3-track masters to create Quad, Columbia seemed hesitant to do the same. Shame though as they'd used 8-track as far back as 1965!
My one wish was that somebody had considered the Bobby Fuller Four for Quad. According to Mr. Hoffman, an awful lot of Bobby Fuller's material was recorded on then-experimental 10-track equipment. Imagine something from 1964 in very discrete Quad! Even listening to Bobby's stereo cuts, there's an awful lot going on in some of those mixes!