Groove agent acoustic - pattern edit

I like groove agent acoustic kit a lot. You can tweak it in an extreme way.
One thing i was trying to do is to make my own pattern that i can use with the acoustic kit and use those variations in intensity and so on. But this is not the old-scool pattern i am used to, so:

Is a pattern in the acoustic kit a bunch of layers of midi patterns ?
If yes: how do i combine them.

Or is the variation that can be done within the pattern based on IQ added notes ?

Is it possible to make such a thing on your own, with your home-made midi patterns ?

kind regards,