Funnily enough (and I think someone remarked upon this at the time), Rhino used the Quadradisc version of the album cover for the replica jacket they included in the recent Changes box set. The quad mix was not part of that set--the disc inside the jacket was a stereo CD, like all the others--but maybe that was a coded message from the future? Although the Quadradisc version of the album has a grey border....You WIN! The cover is looking very purple. Also, Mingus is one of my favo(u)rites through the Surround Master, so . . . let's go with that!
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The quad mix itself is by İlhan Mimaroğlu, a fascinating guy (Google him!) who also mixed some of his own experimental electronic music in quad, both for his own Finnadar imprint and for Folkways Records. For Atlantic, where he was a producer, he also did the quad mix for Ellington's New Orleans Suite.