An account put together from various Lacy interviews:
The musicians were regular Lacy associates of the time, based in Rome. Enrico Rava's wife was from Argentina, and booked them a series of concerts at a theater in Buenos Aires. They bought one-way tickets, but hardly made any money in Argentina, and couldn't afford to get home for eight or nine months.
"That was the wrong group at the wrong time in the wrong place playing the wrong kind of music...." He said that they did build up a small following over the months, but they were really glad to get out of Argentina.
Thanks for unearthing those quotes. Seems extraordinary that they achieved excellent and well recorded session under those circumstances.
That also explains for me why some early Rava leader sessions are recorded in Argentina. Thanks Jeffcrom