David thank you very much for your answer, I did it and it works! So i can finally do that with midi notes, and it's great! But....second step: how about .wav files?
For what I understand, changing a midi note, is like playing a different key on a keyboard on which a specific kit (or instrument) is loaded.
If i load, on one pad, a factory voice (for example maple snare) that is part of a kit, it seems like that changing the midi note of the pad allows me to move around that specific kit. In this case changing the voice (to kick drum for example) or changing the midi note (to the key of the same kd) has the same effect (if i am not wrong..)
But if i assign a personal sample, in wav format, on a pad (it is not part of a kit), changing the midi note will not have the same effect. Can i assing different wav files to the 4 velocity layers?