Apple has enabled user-facing voice customization for its "Siri AI" assistant in the iOS 27 developer beta 3, released around July 6, 2026. Turning on "Expressive Voices Preview" in the Siri section of the Settings app reveals two sliders — "Pace" for speaking speed and "Expressivity" for emotional richness — and Siri plays a sample phrase such as "You have one new message" each time a setting is changed so users can compare (TechCrunch). Voices are offered in several accent variants, and each slider reportedly offers roughly five steps.
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