Hi @mpsb,
Thank you for reaching out to Microsoft Q&A forum!
Voices in the Azure Voice Gallery are primarily synthetic, created using advanced machine learning and AI techniques. While some voices may be based on recordings of a specific natural person's voice to achieve a particular tone or style, the resulting voice models are typically synthetic.
Some voices are created from recordings of a specific person's voice, capturing their unique characteristics but often modified during synthesis.
Other voices are entirely AI-generated, not based on any real person, designed to sound natural but without a real-world counterpart.
In practice, Azure may use both methods depending on the specific requirements and design goals of each voice. Some voices might be designed to offer a high degree of naturalness by starting with recordings of a specific person, while others might be generated entirely synthetically for broader flexibility and privacy considerations.
For more info see: Code of conduct for Azure AI Speech.
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