Hello @pierre-gilles,
I’m sharing with you this local TTS that runs on low-end configurations and that I find works wonderfully.
The French-language transcription sounds very natural.
Here is the official site:
Stay tuned 
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Nice! What kind of configuration did you test it on?
If you have examples of generated files, I’d be curious to see what the output looks like.
I came across it by chance and tested it on Android; it works very well. I haven’t tested it any further.
Indeed I tested SuperTonic 2 in the browser here:
And it works pretty well; I’m on a MacBook Air M5 with a fairly powerful GPU, so I’d be curious to see if it runs on a mini-PC 
Tested on my late-2013 MBP with 8 GB of RAM and 4 cores, and it runs very well once everything is loaded, with text and voice changes.
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It’s made for embedded IoT devices, so it should work. It works on an e-reader, on Raspberry Pi (RPI) too.
It’s promising
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