I started looking into the Jack session a few months ago. It may have been a Jazz Alive recording, which means there may be more.
It is not clear when they stopped recording, but all the tapes they have been pitching to the Feldmans, Dorns and Sunnenblicks of the world are 60s and 70s. I would like to hear Old And New Dreams, Dewey Redman etc.
It all goes back to getting a master list of what was recorded and what is still held. I am convinced there is more than one source.