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    <p>Your code snippet is borked, you're using <em>synth</em> after it is disposed. But that's not the real problem I'm sure. SetOutputToAudioStream produces the raw PCM audio, the 'numbers'. Without a container file format (headers) like what's used in a .wav file. Yes, that cannot be played back with a regular media program.</p> <p>The missing overload for SetOutputToWaveStream that takes a SpeechAudioFormatInfo is strange. It really does look like an oversight to me, even though that's extremely rare in the .NET framework. There's no compelling reason why it shouldn't work, the underlying SAPI interface does support it. It can be hacked around with reflection to call the private SetOutputStream method. This worked fine when I tested it but I can't vouch for it:</p> <pre><code>using System.Reflection; ... using (Stream ret = new MemoryStream()) using (SpeechSynthesizer synth = new SpeechSynthesizer()) { var mi = synth.GetType().GetMethod("SetOutputStream", BindingFlags.Instance | BindingFlags.NonPublic); var fmt = new SpeechAudioFormatInfo(8000, AudioBitsPerSample.Eight, AudioChannel.Mono); mi.Invoke(synth, new object[] { ret, fmt, true, true }); synth.Speak("Greetings from stack overflow"); // Testing code: using (var fs = new FileStream(@"c:\temp\test.wav", FileMode.Create, FileAccess.Write, FileShare.None)) { ret.Position = 0; byte[] buffer = new byte[4096]; for (;;) { int len = ret.Read(buffer, 0, buffer.Length); if (len == 0) break; fs.Write(buffer, 0, len); } } } </code></pre> <p>If you're uncomfortable with the hack then using Path.GetTempFileName() to temporarily stream it to a file will certainly work.</p>
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    1. COCome to think of it, the last argument probably should be false so it doesn't close the stream. Wouldn't matter for a MemoryStream though.
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    2. COYou're right, synth.Speak() was inside the using in my code. I've edited the code snippet. I'll give your code a shot, it looks like it will accomplish what I'm asking. I agree that it looks like an oversight. Thanks!
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