He has created two handheld controllers combined with a iPhone, mouthpiece and has been experimenting with a foot-piece as well. With his unique invention he makes music with his entire body and has dubbed it “BeatJazz”
In the TED stage in the video below he starts by locking in beats then proceeds to freestyle over it.
If you just want to skip the explanation and get right to the music it starts around the 10 min mark.
You can find out more about Onyx at his site here