Well actually it's a machine that produces drum sounds and patterns. The sounds you're playing are actual sampled sounds from a live kit. Some are so good on my MRT-3 that you can actually hear the the vibration of the snares under the drum. How the patterns are actually recorded is another thing... I would assume that the majority of them were step recorded into the unit using the internal sounds.. However I think some units ultilize live playing with the patterns, which gives them a nice natural flow to them..

Squeak