You may now pre-order old Soft Machine material from Amazon. "Turns On" volum 1 and 2 are released again 7 March on Evangaline. They look just like the ones that were released in 2001 (Voiceprint).
The band is mainly Robert Wyatt, Mike Ratledge and Kevin Ayers, with Daevid Allen on some tracks on volume 1 (according to ProgArchives, I do not own these albums yet).
You will find info on the Soft Machine albums with Robert Wyatt on them over at "Une Discographie De Robert Wyatt" and the Calyx Canterbury discography.