overdrive effects such as the use of a fuzz box can be used to produce distorted sounds, such as for imitating robotic voices or to simulate distorted radiotelephone traffic (e.g., the radio chatter between starfighter pilots in the science fiction film Star Wars).
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It is also used intentionally for aesthetic effect in such pop songs as Cher's Believe and Madonna's Die Another Day.
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The voice of C-3PO from Star Wars was created by taking the actor's voice and treating it with a phaser.
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Ring modulation, also known as amplitude modulation, is an effect made famous by Doctor Who's Daleks and commonly used throughout sci-fi.
A leveler performs an audio process similar to compression, which is used to reduce the dynamic range of a signal, so that the quietest portion of the signal is loud enough to hear and the loudest portion is not too loud.
Except in animated sequences, waveform analysis was used to make characters' mouths match their dialogue.
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