I'm reminded of a thing I read about generating "yellow letters" for real estate leads. The letters look like someone handwrote them on a steno pad. If you us

I'm reminded of a thing I read about generating "yellow letters" for real estate leads. The letters look like someone handwrote them on a steno pad. If you used a handwriting font they would look fake. But you can't handwrite each one, that'd take to long for thousands of letters. What they do is get a handwriting font made of their handwriting, and sure it looks fake. But they write most of the letter template out by hand and use the handwriting font for just the parts that change. I wonder if something similar is going on here, where they have taught the speech synthesis a bunch of phrases and they color in the bits with synthetic speech where it's needed. The inflection is also easier to specify in those cases.