Thank you for your advices!
I did come a small step further:
I tested to send from Ksoloti direct to my MacBook (via Midi USB Cable):
Interesting: in DIN Mode (Object) the USB Midi Led is flashing - but no Midi Message in the Midi Monitor coming in - hmm. But definitly a reaction when I moving my Poti
When changing to “USB Device” on the Ksoloti the USB Connector does not flash anymore - but the Midi signal is going in (Midi Monitor)
Correction: I have full Midi information from the Ksoloti to the MacBook!

It wasn’t a good idea to use the axolotis DIN Conectors because of the inner circuit. So I did remove the DIN Connectors from my Axoloti.
Now I will try it with an Resistor to the Kemper.
Ksolotis Midi IO works fine!
Thank you for your advices!
AAAAhh - So close!!
You were right! I found a 500Ohm Resistor. I putted in between MO5 and 5V not much change in Voltage but Kemper Profiler does react.
But now it won’t connect to the software anymore aaaah
So now I have to make a switch to remove the resistor from the circuit??? any other solution?
Regarding Mario
UPDATE: With 250 Ohm now it works fine, KEMPER REACTS AND SOFTWARE DOES RECOGNIZE KSOLOTI -
YIPIEEEEEEE :-)))))))))))