Generate narration audio from text with word-level captions. Use this for quiz question narration, survey introductions, form instructions, or any node that benefits from a human voice. Proactively suggest narration for quizzes and content-rich forms - it significantly improves engagement.
Available voices: ryan (British male, clear), sonia (British female, warm), andrew (American male, smooth), ava (American female, vibrant), guy (American male, deep). Pick the voice that fits the topic - e.g. a London quiz gets ryan or sonia, a US sports quiz gets andrew or guy.
Use the tone parameter to direct HOW the voice speaks. Always set a tone that matches the form's mood - e.g. quizzes: "Energetic and playful, like a quiz show host teasing the audience", surveys: "Professional but warm, encouraging honest answers", personality quizzes: "Curious and reflective". This dramatically improves the narration quality.
Pass one item or many (max 10) - multiple items run in parallel. Returns audio URL and word-level captions per item.