The pads are extremely good at translating the velocities of the hits. You can trigger any velocity you wish, from 1 to 127 and everything in between. The only limitations on the variants in sounds is due to EZDrummer itself...and that's really not that much, haha. The module and pads send the velocities you hit, it doesn't just pick a set one and send that one only. That's why you can do ghost notes, blast beats, all kinds of shit and it ends up being realistic because you have to hit the pad much like you would a real snare to get the same sounds out of it. On blast beats the snare hits are lighter, which triggers between 85-95. Then for regular parts the typical hit is between 110 and 127, which does trigger different samples for the "full-on" hits like that. You can do like 12 different ghost notes depending on your initial hit's velocity.
Long-story short...it translates much like a real snare drum/tom would, only with the obvious differences.
~e.a