Hi Chris,
thanks a lot for your answer!
I wrote to the Kemper support and that's what they told me. I also remember hearing that once a while ago, before I used it via spdif, so the info seems legit.
As I'm not home right now, if I want to set the interface as a slave, do I do this in the hardware preferences of the core audio manager or in my daw?
I'm not too experienced with spdif, as you can tell