It's a shame that the screencast has no sound. I was curious about what it would sound like. I could try it myself via the netlify app but I don't feel very comfortable sharing my API key somewhere...
I posted a screencast on Reddit earlier in the development process with audio demonstrating the text-to-speech feature. The UI has changed a bit since then, but you can hear what the voices sound like:
tottenval|3 years ago
https://old.reddit.com/r/OpenAI/comments/11k19en/i_made_an_a...