Too shy to make funny voices while using your sock puppet? Be
the life of a party, with a MIDI sock puppet that can make silly
'singing' noises or play a synth. A single flex sensor (we're guessing)
can even manipulate pitch in a mode. Brought to you by UK's Matthew
Irvine Brown and, of course, via near near future. HP's DJammer has nothing on this.

Link (with videos and tech details)