The demonic voice heard in The Exorcist was not simply Linda Blair's electronically altered speech. William Friedkin and the filmmakers eventually hired veteran voice actress Mercedes McCambridge to create Pazuzu's harsh, androgynous sound. McCambridge pushed her voice to an extreme by eating raw eggs, drinking whiskey, and chain-smoking cigarettes, using the physical abuse of her vocal cords to produce a rasp that sounded unlike an ordinary human performance. Her work became one of the film's most recognizable technical achievements, yet Warner Bros. initially failed to credit her.
The omission triggered a dispute serious enough to go before Screen Actors Guild arbitration. McCambridge's name was restored to the credits on all but the first thirty prints, but the conflict had further consequences: the planned soundtrack album containing excerpts of the demon's dialogue could not be released because of the credit controversy. The episode also reflected a broader practice of minimizing voice and stunt performers whose contributions were essential but easily hidden behind the credited star. McCambridge's eventual recognition established that Pazuzu's vocal identity was a separate performance, not merely an effect applied to Blair.
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