Thank you all very much for your hints & ideas here. For a newbee like me very useful and very interesting. I hope I can be at some point at some help for someone as well. At the moment, I am afraid I am full with questions (see other threads) ;-) So thank you very much for your kind patience too!
For review reports of Eurorack modules, please refer to https://garfieldmodular.net/ for PDF formatted downloads