This video demonstrates ducino2’s BBox Drum Generator – an Arduino-based MIDI sequencer housed in a banana box:
The BBox Drum Generator is an Arduino-based Midi sequencer mounted inside a Banana Box. The BBox contains a few preset drumbeats. These drumbeats form the basis for a drum variation algorithm. The amount of introduced variations is controlled by the blue rotary knob.
The two top buttons navigate through the functions of the BBox. The two lower buttons change the value of the function.
The BBox only generates midi messages, the sound is generated by a Roland Juno-D.
More photos and info are available at the Projectify site.