The Alesis SR-16 drum machine delivers comprehensive MIDI programming and and use as a sound module for serious music programmers. The drum machine's samples can be tweaked with Dynamic Articulation which alters the drum tone depending on how hard it's hit. Alesis includes 50 preset rhythm patterns, each with an A and B variation plus A and B fill, for a total of 4 different rhythms in each pattern. The SR-16 drum machine's 50 user drum kits give you plenty of versatility.