could loops be used to do this? I was looking through my loops library last night... there are scads of commercially available drum loops, many of them individual drums at different intervals that could be set up on individual tracks and tweaked differently.

And the RB-2012 new features video showed an example of saving a portion of a realtrack to reuse as a loop... I guess the same thing could be done to a realdrum snippet?

Once you had the snippets of individual drum samples,you'd be there.

And unless you were selling theidea as a product, I doubt there would be any repercussions.