title: Add another voice into .NET Speech
body: <p>How can I add another voice into .NET Speech? I'd like to use Czech voice. I've found some <code>*.sis</code> files <code>Eliska22k.sis</code> but I don't know how to use it.</p>
  
  <pre><code>SpeechSynthesizer synth = new SpeechSynthesizer();
  foreach (var voice in synth.GetInstalledVoices())
      Console.WriteLine(voice.VoiceInfo.Name);
  </code></pre>
  
  <p>Gives me only <code>Microsoft Anna</code>.</p>