Quote:
Originally Posted by kovidgoyal
It's now using the winrt winspeech subsystem which Microsoft says is what should be used in modern apps. SAPI is deprecated. I have no idea how to get that subsystem to read more voices. Note that you can continue to use SAPI in calibre by setting a "plugin tweak" in Preferences->Tweaks->Plugin tweak of
prefer_winsapi = True
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Thank you.

This tweak will suit me just fine for as long as SAPI still works. I don't think I've ever noticed that Tweaks page 'Plug-in tweaks' button before ... but I've only been using calibre for 14 years.
I wonder if this is MS's way of trying to force people into using a paid subscription charging TTS by wordcount sent to the cloud? Do you know whether there are any currently perceivable benefits of using the winrt winspeech subsystem?