Zombies never really die...
I was able to partially restore a very old harddisk where I found an archive, and I could read at least some description files.
Some of the missing modules were made by Alexander Koch (Falter / Liquid Cage · PFM · FCORave).
In the meantime I discovered the "Nectarine" scene music web radio (they also have a Discord server) and other Amiga demo scene music archives. I'll keep digging...