What voices do you recommend? The ones I had checked out (about a year ago) - the voices were mostly european-sounding, and flat, and not so natural-sounding. Is Piper the best open-source text-to-speech engine out there?
If this is for personal use the best local TTS is to grab a Mac, set the system voice to one of the current Siri voice models, and then use the 'say' command in the terminal. Yes, really. The nonbinary voice #5 in particular does really well at technical terminology.