
The trick with the beat that is mixed in on this video, was simply done by subtracting the rhythm recorded from the robot on the video, and adding this to the video's sound track.
Yellow Drum Machine Bot was made for Audiofile Engineering, and the robot will be a prize in a contest. Visit here for details on entering the competition
Frits Lyneborg made the robot and video see more robots and other like Yellow Drum Machine Bot here.