So, a #MPX8 suddenly appeared with my #synthesizers.
The official software does not work with wine. Naturally, I spent the evening dissecting the proprietary kit file format.
This is what I found out so far:
https://gist.github.com/annikahannig/f91d720253d3d3774d273bf094610915
I guess I could now try to implement something.
In general I think file format specs and circuit schematics should be included with every hardware.