Thank you for the fast reply. I think there must be something else that does not allow my playing and recording of midi tracks, because the Steinberg Yamaha driver provides both the audio than the MIDI interfaces; it is correctly configured in Audio/MIDI page and it is right choosen because it is perfectly working with another MIDI application (Sibelius 6 First).
Moreover the metronome signal can be clearly heard from the Yamaha Digital Piano speakers; however neither the notes written by piano roll, during playing, nor the notes played by my Digital Piano, during recording, can be heard by the speakers or written on the piano roll.
What else, in your opinion, could be ?
Best regards