Patent ID: 7087830

Claim:
Apparatus for manually controlling at least one segment of a computer generated audio and visual presentation comprising: a turntable having a pick-up arm and a rotatable platter, the pick-up arm being positionable at selected positions over the platter; an optical sensor mounted at an end of the pick-up arm and having a pair of optical detectors positioned for alignment on spaced radii of the platter; a pattern disk positionable on the platter and having a plurality of arcuate bands of alternating black and white stripes within each band wherein the optical detectors provide a sequence of electrical pulses corresponding to transitions between the black and white stripes as the disk is rotated adjacent the optical detectors, the electrical pulses being representative of the speed and direction of rotation of the disk; a MIDI converter coupled for receiving the electrical pulses and for converting the pulses to a MIDI formatted control signal; and an audio and visual performance device coupled for receiving the MIDI formatted control signals from the MIDI converter and being responsive thereto for controlling the speed and play direction of an audio and visual work produced by the device.