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The content server cant use piper, it can only use whatever voices are available on the device the browser is running on. Piper is *very* CPU intensive I don't think its appropriate to expose it via the server as doing so could lead to the server being DOSed very easily. Just two people using it at the same time would saturate the CPU of most servers.
If a sentence is too long it is split up that is probably the cause of your last word not being selected, this is done so that audio starts playing asap.
1) There is no UI for it, but you can just go in to the calibre cache directory and delete the piper folder or the voice .onnx files inside it, they have proper filenames.
2) The voice is chosen based on calibre UI language not book language. I'm not really a fan of having the voice changed automatically based on book language, but maybe an option for it. SOmeday if I am bored, or a patch is welcome.
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