In Oct of 1984 the world premiere of Digital sound in a motion picture theatre took place, using Moroder's digitally recorded version of Metropolis. Orchestrated by John Allen of High Performance Stereo, the event took place in the Magestic Century Plaza Theatre in Los Angeles and was an invitation only event consisting of a few hundred sound professional in the industry. Since the technology of placing Digital sound on film did not exist at the time, the 5 track discrete audio was recorded on an Industrial Sony 3324 digital tape recorder and synced with the picture. The sound system used to present this historic event was John Allen's HPS-4000 system and had the acoustic power equal to 10 Symphony Orchestras.

Film

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