Hi Miroslav,
I had the bigger brother Doepfer - A-190-5 and had enormously problems with understanding that module, so perhaps you have a similar issue with the A-190-4. I love to work with Doepfer's modules except these A-190-x series...
I also had connectivity problems, one of my problems was the MIDI channel setting with this A-190-4/5 module, so check if your MIDI channel settings are correct otherwise dig the manual again and read through it again. I had done that many times and barely could fix the problems. I exchanged the Doepfer module with a Vermona - qMI 2, so much better and logical than the Doepfer one.
Good luck with the troubleshooting and kind regards, Garfield.
For review reports of Eurorack modules, please refer to https://garfieldmodular.net/ for PDF formatted downloads