Voice Experiments is a showcase of what’s possible when you bring open-ended, natural conversation into games, music, storytelling, and more.
..here is Voice Experiments: Story Speaker
.See all the experiments here:-
https://experiments.withgoogle.com/voice
or check out MixLab
Read about The Conversational UI and Why it Matters (pdf)
https://developers.google.com/actions/downloads/get-started.pdf
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