The system USB controller doesn't recognise the Kemper.
I'm connecting like this: Kemper (USB-B) -> cable -> (USB-A) -> converter -> (USB-C) MacBook Pro.
The Kemper is running 5.1.1.12825
The Macbook Pro is running MacOS 10.12.4
The Rig Manager is version 2.0.19
The Kemper MacOS driver is version 1.2.1