title: How to add a voice using Web Speech API
body: <p>I've been reading the <a href="https://developer.mozilla.org/en-US/docs/Web/API/Web_Speech_API/Using_the_Web_Speech_API" rel="nofollow">Web Speech Api documentation</a> and I've done some examples but i would like to change the voice but not for a standard system voice (voices getting by executing SpeechSynthesis.getVoices()).
  The <a href="https://developer.mozilla.org/en-US/docs/Web/API/SpeechSynthesisVoice" rel="nofollow">SpeechSynthesisVoice</a> object has the voiceURI property that indicates the speech synthesis service.
  I think that i need to make a SpeechSynthesisVoice object indicating my speech synthesis service but i don't know how to make one or where can I found one. 
     The question is: Is there any open source platform that provides that or I must use the voices provided by the browser (voices getting by executing SpeechSynthesis.getVoices()) ?</p>