>>869
using System;
using System.Speech.Synthesis;

namespace SampleSynthesis {
class Program {
static void Main(string[] args) {
using (var synth = new SpeechSynthesizer()) {
synth.SetOutputToDefaultAudioDevice();
synth.Speak("This is sample text-to-speech output.");
}
Console.WriteLine();
Console.WriteLine("Press any key to exit...");
Console.ReadKey();
}
}
}

これコピペして動くか？