Thank you. I red but I would appreciate if someone explain me what is it for? In which case do you use the range of zones high, middle and low, differently for each CASM section? My idea was to assign for each zone a range zone and assign for each zone a different set of chords (major, minor or 7th). When you play a major chord assigned at a specific range, the other chords assigned at different zone are muted. So, you could use only one track for each type of chords. But, it seems that you don't.