@gumbo23, @farkas, @Broken-Form: +1 on the Synthesis Technology E352 Cloud Terrarium.

But this fundamental remark: ambient music cannot be defined by an instrument but by the use one makes of it.

Brahms and Debussy used the same violin in their orchestra, but their music is so different... The use of a DX7 by Brian Eno is not the same by Jean-Michel Jarre. And Plaits will serve ambient as well as techno.

Focusing on the choice of a module too often distracts from the problem of creativity. I am not immune to this either. And the question comes up again every time you power up your modular ;)

'On ne devrait jamais quitter Montauban' (Fernand Naudin).
https://soundcloud.com/petrus-major/tracks