Siri: the story of a computer's voice

GM Voices is nestled on a rolling, leafy road in Alpharetta, Georgia, an affluent suburb of Atlanta. A recording studio specializing in voice-over work, it produces narration for corporate training videos, voicemail system prompts, and the like — not exactly sexy stuff, but steady, and for the best actors, lucrative.

September Day is one such actor, and on a morning in 2011, she arrived to begin work on a special project.

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