programmable drum machine. Use the horizontal row of levers to program your sequence. From down to up, sounds include kick/bass drum, snare drum, closed hat and rimshot. Vertical row of lamps on the left indicate what instrument is being muted/unmuted. Bar of lamps on top indicate the part of the sequence that is being played through. Bottom left lever is for playing and stopping. Also you can't have 2 active steps right next to each other because it's too fast for the observers in the redstone.