Re-posting info from #106 (thanks @delta003):

1. Natural Reader Install Voices Carry On

Magnets and Ladders Active Voices of Writers with Disabilities Fall/Winter 2017-2018. Editorial and Technical Staff. Coordinating Editor: Mary-Jo Lord.

Assuming there is a internet connection, we can just use Google TTS API
(e.g. http://translate.google.com/translate_tts?tl=en&q=Integrate%20text%20to%20speech)
It should be fast enough and I think it covers all languages as Google Translate

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The link is the example of HTTP request. You just make HTTP to translate.google.com/translate_tts setting tl=language (two letters shortcut for language) and query=what_do_you_want_to_say (make sure you escape this string). HTTP response have Content-Type:audio/mpeg so from response you can get audio file. Then you just pass that file to system to play it (I'm don't really know C# but this should be easy). Here are some useful links:
http://stackoverflow.com/questions/184683/play-audio-from-a-stream-using-c-sharp
http://stackoverflow.com/questions/7757881/c-sharp-download-text-to-speech-from-google-translate-comes-with-problems
http://stackoverflow.com/questions/9243560/how-can-i-use-google-text-to-speech-api-in-windows-form
I don't have access to Windows now, so I can't implement this, but if you want I can write you a class that implements IAudioService and use this approach. But you'll have to check it and probably debug it. Just ping me here if you need that. Also, I'll have access to windows in ~month so if this issue is still open I'll develop a feature.

Natural Reader Install Voices Carry On

I would like to split out the IAudioService as it's currently in breach of the
single responsibility principle. There should really be an interface and
class for playing sounds and an interface and multiple classes for speech.
Then I can just swap out one speech service for another, and even nest them
so we can fall back to Microsoft TTS if there is no active internet
connection, for example.

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