Opto-Phono-Kinesia (OPK) is a body-based audio-visual performance piece. The title is a play on the possible synesthetic state involving connections between vision, sound and body motion. Using the Gesture and Media System 3.0 (GAMS) motion tracking system, the performer can dynamically manipulate a complex audio-visual environment using two small infrared trackers. This enables the performer to be a virtual conductor, conjuring an immersive environment with the body itself. OPK exists as both a performance output and a driver for technical developments of the GAMS system. The latter of which will have broad value for interaction designers, motion specialists, and composed theatre performers.