My understanding is that Joe [Travers] (and/or Spencer [Chrislu]) was/were working on a Petit Wazoo project and noticed some songs being cut out of the show tapes, and then found that FZ had cut them out and done the mixes which came out on ID.
That is, they assembled their own Petit Wazoo album before discovering the FZ-produced tapes, which of course trumped theirs and were released as Imaginary Diseases. But that still leaves Joe and Spence's Petit Wazoo album for possible future release.
These titles are from a collection of live performances (1972) selected and mixed by FZ between 1972 and 1977. [...]
Fz quotes: ROLLO/SAN BER'DINO on the Montreal solo on IMAGINARY DISEASES.