OK, still got to schtum about somethings.
"Rest of Meddle quad doesn't exist, never did. Only Echoes was done." Doesn't this destroy one of our most long held and cherished myths??
In fact the myth of a complete Meddle quad was just based on presumption. The report that started the myth stated that a quad mix of Echoes was performed for press around the time of the release of Meddle:
From:
http://www.pinkfloydonline.com/faq/question37/
"17 October 1971 — A quad mix album of “Echoes” is played for press at the Roundhouse, but the quad mix is never released."
Never until 11/11/16!
There is some mention of the quad mix in the Shine On box, but I do not have that so I cannot comment.
In production notes published here:
http://floydlyrics.blogspot.com/2010/03/meddle.html
there is reference to a quad mix session, but it is probably just the Echoes mix prepared for the press. I have never seen a source stating emphatically that the whole of Meddle was mixed in quad. It was a hope, not a verified source.