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François Bayle created the Acousmonium, a loudspeaker orchestra, in 1974 at the GRM in Paris. The Acousmonium contained eighty speakers of different sizes placed across a stage at varying heights and distances. Their placement was based on their range, their power, their quality, and their directional characteristics. In his words, "It puts you inside the sound. It's like the interior of a sound universe."

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In the photo at the left, François Bayle (seen from behind) seated at the Acousmonium control panel in the Salle Olivier Messiaen, Maison de Radio France, Paris, in 1980. Photo courtesy GRM.

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