How to change the text-to-speech voice on your Mac computer, or give it a new language

https://www.businessinsider.com/how-to-change-speech-voice-on-mac

Highlight the text and press “Option + Esc” keys.

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Dictate your messages and documents on Mac

double press the “Command” key (if you are using OS Catalina)

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more on voice recognition in this IMS blog
https://blog.stcloudstate.edu/ims?s=voice+recognition