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I use ms edge for this exact use case. Works well enough on any platform

Yup, I second this. The only thing I use Edge for.

I did a bit of research and it seems to be, by far, the highest-quality TTS engine that is free and you can do things like pause and continue.

There are other options that have higher-quality voices, but they aren't free.

I use the wavenet extension and use my 1M character free quota from Google cloud