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The next major development in multitrack recording came in the mid-1950s, when the Ampex corporation devised the concept of 8-track recording, using its "Sel-Sync" (Selective Synchronous) recording system, and sold the first such machine to musician Les Paul. In 1948, Chicago's Armour Research Foundation announced that its staffer, physicist Marvin Camras, had produced a three-channel machine with "three parallel magnetic tracks on the same tape." The history of modern multitrack audio recording using magnetic tape began in 1943 with the invention of stereo tape recording, which divided the recording head into two tracks. Alan Blumlein, a British engineer at EMI, patented systems for recording stereophonic sound and surround sound on disc and film in 1933. The tracks were recorded one at a time in separate passes and were not intended for later mixdown or stereophony as with later half-track and quarter-track monophonic tape recording, the multiple tracks simply multiplied the maximum recording time possible, greatly reducing cost and bulk. Hoxie and first demonstrated in 1922, recorded optically on 35 mm film, and some versions used a format of as many as twelve tracks in parallel on each strip. The pallophotophone, invented by Charles A.
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The first system for creating stereophonic sound (using telephone technology) was demonstrated by Clément Ader in Paris in 1881. Because they are carried on the same medium, the tracks stay in perfect synchronization, while allowing multiple sound sources to be recorded at different times. Multitrack recording of sound is the process in which sound and other electro-acoustic signals are captured on a recording medium such as magnetic tape, which is divided into two or more audio tracks that run parallel with each other. Scully 280 eight-track recorder using 1" tape at the Stax Museum of American Soul Music
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