How can I use TTS for non-supported Languages or Voices?

For non-supported languages or voice you can create a custom audio file and include it in the text-to-speech request.

From https://docs.nexmo.com/index.php/voice-api/text-to-speech 
Play a pre-recorded audio file (.wav or .mp3)... 
<audio src="http://www.villagegeek.com/downloads/webwavs/Austin_Powers_groovy.wav"/
Note that you need to make sure that the audio file is on a public URL.

 

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