Right in my wheelhouse (I own the entire Ultimate Spinach catalog, first two Strawberry Alarm Clock albums, etc.). What you need to understand is that quad releases did not become common until the early/mid 70's. So the quad release of that legendary 1967 album was done long after the initial release of the album on the poorly distributed Spartacus label. The quad mix was done from the master tapes by a sound engineer who did not understand the subtleties of the group's music, and was more interested in showing off the quad technology than faithfully representing the art of the MGW. As a fold down of that quad mix is the one that is now commonly heard on the 1992 Collectables CD, it is a great disservice to the legacy of that groundbreaking group. A good copy of the original vinyl on Spartacus will set you back a couple of hundred dollars, if you can find it at all, but is well worth it for true fans of this masterwork. The album cover of the original release has also become infamous, not "appreciated" by the 1960's censors, who thought they saw "drug references" a la "Eight Miles High".