Yes, dear Williams and Goran
This was a misunderstdanding for me too, because I never was in need to create a new complex sound. Now it's clear. Slots, for the organ, are ment to create new regitstrations. And this will be very usefull.
Still my "problem" is: how to have a, let's say, 4 voices counterpoint (SATB) with 4 different registrations (1 for each voice - in 3 different manuals + the pedals)? Still the only way I see is to create 4 tracks, each one with a different organ (VI pro in VE Pro).
This the structure, the rest is "the color".
I'll be away one week...
Thanks a lot for your time
Roberto