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Personal Orchestra lets anybody conduct an electronic orchestra at a new level of realism: users interact not with a synthetic, but an original audio and video recording of a real orchestra--the Vienna Philharmonic. Nevertheless, they can interactively control not only volume and instrumentation, but also tempo of the orchestra, using natural conducting gestures. A gesture-tracking and -predicting algorithm interprets user input, and a high-fidelity playback algorithm renders audio and video at variable speed without time-stretching artifacts such as pitch changes. The system was designed following a set of user interface design patterns for interactive exhibits. It is being used as the "Virtual Conductor" exhibit in the HOUSE OF MUSIC VIENNA by hundreds of visitors every day.