Hey, Maik, no worries– often folk just click the Like 
then go off for a while to think and test!
By the way, there’s a bit in the tutorial I think you’ve done, just above this bit…
…which shows the Keystep producing extra CCs on Start/Stop.
(I’m not sure why the good folks at Arturia have done this but a CC Range Filter will to get rid of the unwanted CC54 & CCC51 messages)