 It offers the violin player a range of expressive possibilities in its form as an augmented bow controller that lends itself to the control of bowed string physical models.The creation of musical instruments that utilize technology to increase the functionality and subtlety of control has been an endeavour of Tod Machover and his research group since 1986.This collaboration has produced a series of "augmented instruments" called Hyperinstruments such as the HyperCello, an acoustic cello created in 1991 for Yo-Yo Ma.