Seems like I did what nobody ever should do: I changed a running system... maybe somebody of you folks can see what I currently do not see and give me a hint how to solve that please.
After years of completely flawless and very convenient recording via SPDIF when Kemper was clock master and audio interface was clock slave I needed to change that setup a few days ago due to some other changes in the studio. Now my Kemper is clock slave. Sychronization looks fine, see picture below, it reflects whatever I select in the control panel of the audio interface (M-Audio/AVID Fast Track C400 - old but trustworthy and so far good enough for what I do here). No other setup changes.
Now no signal comes through in that setting. When I switch back to Kemper is master and interface is slave it immediately works as it did before and the signal is absolutely fine. Pretty strange
So what goes wrong here? Any hints? Any parts of the manual that slipped off my memory? Appreciate your help Kemperians!
OS Version 8.7.20 44681, I have not upgraded to 9.0.5 yet in order to not confuse my system with the USB audio interface functionality.
SPDIF cables (both for in and out) did a fine job for recording and reamping for years. Checked them all though.