I am the Ball

This paper presents the design of an original musical interface for a one-off performance in conjunction with a live football match. The instrument was built using a repurposed Gametrak string controller, transforming it into a haptic device that embraced limitations as a generative design space for musical expression. The paper will focus on the design of the interface and its use in rehearsals and performance, presenting it in context of other Gametrak-based work. I will argue that the hardware functions as a passive haptic device, and that the constraints provide opportunities for performance. I will also suggest that a growing body of Gametrak-based work warrants further investigation.