Thanks to director Sebastiano d’Ayala Valva and the Südwestrundfunk, there is now a probing documentary called Stehende Wellen  about how Occan Océan Cinquanta was made for the Donaueshinger Musiktage. The  SWR orchestra musicians were fine partners.

https://www.ardmediathek.de/video/kulturmatinee/stehende-wellen-radigue-robinson-occam-ocean-cinquanta/swr/Y3JpZDovL3N3ci5kZS9hZXgvbzE5OTA0MTE