thank you for your reply! Yes, I'm talking about Cabbage Studio. Yesterday I forgot to select nanoKontrol in the MIDI settings. Today I do what you suggest and I manage in assign MIDI knob/fader clicking on the parameter on the left window. But there are new problem: assigning a fader 'X' to this parameter don't block the other fader to control the same parameter. Should have I to click again CMD + M?
Thank you again and congratulations for Cabbage, it is wonderful!
P.S. I have attached an image of a simple setup I have tested.