How many movies have Ben Burtt and Enrico Ballarin collaborated on?

They have worked on 2 movies together! Their first movie together was Star Wars: Episode I - The Phantom Menace (1999) and was their highest rated movie together. They have not worked together since Star Wars: Episode II - Attack of the Clones (2002).

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Supervising Sound Editor
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Naboo Courier (uncredited)
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Supervising Sound Editor