Hi Silva,
here a short briefing for settings on 3 separate uppertracks.

1. choose 3 uppertrack sounds you want to use ex. upper1 grand piano upper2 dark pad and upper 3 bandoneon (set all sounds to play mode not mute !!!) now you have the 3 sound on the right side of the keyboard if you have choose the split mode for playing with styles!!!

2. press while holding the "shift" button the "ensemble" button (this is a short-cut to go to the ensemble-menu)

3. press on the touch screen the tab "key velocity" and look at this menu to top key menu, bottom key menu.

4. settings in this menu are:

top key menu change to g7 b5 b4
bottom key menu change c6 c5 c4

5. play now on the keyboard the right parts from c4 cromatic and you will see that the piano plays only at the first octave, the second track plays in the next octave and the thirth track plays in the follow octave.

i hope you understand this information.

let me know!!!

Hope this information helps you.

regards,

Notlos.