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The phonograph was connected by an intricate arrangement of pulleys to the film projector, allowing—under ideal conditions—for synchronization.

However, conditions were rarely ideal, and the new, improved Kinetophone was retired after little more than a year.

Phonorama and yet another sound-film system—Théâtroscope—were also presented at the Exposition.

Finally, there was the challenge of recording fidelity.

The primitive systems of the era produced sound of very low quality unless the performers were stationed directly in front of the cumbersome recording devices (acoustical horns, for the most part), imposing severe limits on the sort of films that could be created with live-recorded sound.

A sound film is a motion picture with synchronized sound, or sound technologically coupled to image, as opposed to a silent film.

The first known public exhibition of projected sound films took place in Paris in 1900, but decades passed before sound motion pictures were made commercially practical.