Beatbox - Andy Huntington

Beatbox from Andy Huntington on Vimeo.

The beatbox is a programmable, physical drum machine first shown in 2005.
The dial controls tempo (in this case all the tappers are synchronised to a fixed loop length so changing the tempo just increases the loop duration, stretching the sequence). One button is play/pause, and the other button changes the mode to the free play mode where you can set each tapper duration individually, creating phasing rhythms.