I see what you did there. When I imported your midi file and used it on SSD 3 it didn't quite sound right, so I just dumped all the notes on the main snare to hear it. Then I put the weaker hits on the snare rolls and it sounded right. What a PITA to get that to sound real though.
Yeah, AD has a number of different snare hits so thats why the softer notes were on a different line.
Honestly.. that took all of 10 minutes to do. You could probably finish an entire song in about an hour. Use a plugin or whatever (I use Sonar which comes with one) to randomise the velocity of the entire thing by say, 10. Then I go through to all the fills and do those manually.