The only thing that make me wonder about if this is a CS60 or CS80 was that JMJ seems to use the Doepfer ribbon controller instead of the synth ribbon controller, and moreover I couldn't see the synth's ribbon controller !!
About the vocoder, I wonder aswell why he used one... but maybe this is not a vocoder, as when they play Oxygène 4, just before beginning, they told alltogether : "un, deux, trois, quatre", and then, baoum, Oxygène 4

Maybe they used a mic to speak together ?

My music, webdev, photos, videos :
www.nicolaskern.fr
Robert Dugenou
Attended :
Teo&Tea showcase in Cannes [France] - 20/05/2007
Théâtre Marigny, Paris [France] - 15/12/2007
<2010> Marseille [France] - 20/03/2010
Monaco - 01/07/2011
Arènes de Nîmes – 14/07/2016