It is, indeed, a view! The whole purpose of the “Display Filter” is to allow you to view what is assigned to a specific Controller. If you have “Au...

? Part 1 is controlled by cc2, Part 2 will be controlled (separately) by cc3. Your last screenshot shows nothing. Part 1 Volume is controlled by ...

I configured the Part 1 then was ok... configured the Part 2 then was ok too but when I return to check the Part 1, this part...

The question of what does it take to externally control the sliders for PART 1-16 volumes should be answerable. If the keyboard supports this or no...

My external controller don't trasmit on multiple MIDI channels. How can I control the sliders from parts using my external controller. To control the ...

Again, this will depend on the question I asked you: Does your external keyboard controller transmit on multiple MIDI Channels, simultaneously? The...