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Based on the official documentation, Azure Voice Gallery does not provide the option to create a completely new voice. It provides a set of pre-built voices that can be customized to some extent. However, creating a completely new voice is not possible using Azure Voice Gallery. Please see here.
However, Azure Cognitive Services provides a Custom neural Voice feature that allows you to create a custom voice by recording a set of phrases and sentences, which are then used to train a machine learning model. For more details, please refer the Build a natural custom voice for your brand
The production cycle and cost involved in creating a custom voice using Azure Cognitive Services can be found in the Explore pricing options.
Alternatively, Azure AI Speech provides a Personal Voice (preview) feature that allows you to use your own voice for text-to-speech in your application. This feature is currently in public preview and requires the use of speech synthesis markup language (SSML) to specify the speaker profile ID for the personal voice. Also, as this is in public preview, it is not recommended for production workloads. The official Azure documentation on Use Personal Voice (Preview) in Your Application provides more information on how to integrate personal voice in your application using SSML.
I hope the information provided has been helpful in guiding your decision for your use case. Thank you.
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