This means that depending on the developer's preference, they can choose to use a different voice from the default Alexa voice to use when users are interacting with their skill. Developers may want to use the preview to give different voices to characters in games and stories, for example.
Amazon Polly is a service that turns text into lifelike speech, allowing you to create applications that talk, and build entirely new categories of speech-enabled products.
Now developers can already choose to use different voices by uploading their own audio files, but according to Amazon, the use of their Polly voice is better due to its being more natural-sounding.
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More demos are available on a dedicated website, while more details about the research are available in a paper entitled "Understanding and Mitigating the Security Risks of Voice-Controlled Third-Party Skills on Amazon Alexa and Google Home".
Polly's voices are far from flawless, of course, but as they see more use, that could change. Developers can also use multiple voices in a single skill. Amazon Polly makes it easy to request an additional stream of metadata with information about when particular sentences, words and sounds are being pronounced.
Amazon now has a number of different voices with different dialects and accents developers can now bundle into their skills, according to the company's website.