British physicist Stephen Hawking just used an robotic American voice, which then became his signature voice. There is no need for your presentation's TTS voice to match your real voice. I prefer mixing my own voice and TTS voice and make sure they sound different. For example, I could start a presentation like this: (bold part is TTS ) Hhhhhhello. My name is uh... I'll let my device say it.... **name is John Doe**. And and tooooooday I want....... to talk about the mechanism of bird flight. You can consider this topic complimentary to uh... typing.... typing... **related to Alice's presentation....** about about about how eagles hunt. I'll talk about how birds taaaaaaaake off, and stay in air, and and and lastly..... how they land.