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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.
It's all part of Amazon Polly, which was created for Alexa developers back in 2017. Obvious use cases would be adding multiple "characters" to Skill-based games and experiences.
Amazon Polly was first introduced at Amazon's re:Invent developer event in November 2016, and has been steadily ramping up its capabilities in the time since. 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. Amazon Polly can generate speech in dozens of languages, making it easy to add speech to applications with a global audience, such as RSS feeds, websites, or videos.
The bank used the Alexa Skills Kit to create the services.