Name the sound-on-film technology developed by William Fox that had a distinct advantage that allowed for on-location shooting and the production of newsreels (like the one covering Charles Lindbergh's transatlantic flight)?

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Movietone was the sound-on-film technology developed by William Fox that had the distinct advantage of allowing for on-location shooting and the production of newsreels. It used a variable density soundtrack, which made it possible to synchronize sound and image accurately. Phonofilm and Vitaphone were both sound-on-disc technologies, while Vitagraph was a film production company.

Name the Sound-On-Film Technology Developed by William Fox That Had