title: change wav file ( to 16KHz and 8bit ) with using NAudio
body: <p>I want to change a WAV file to 8KHz and 8bit using NAudio.</p>
  
  <pre><code>            WaveFormat format1 = new WaveFormat(8000, 8, 1);
              byte[] waveByte = HelperClass.ReadFully(File.OpenRead(wavFile));
              Wave
              using (WaveFileWriter writer = new WaveFileWriter(outputFile, format1))
              {
                  writer.WriteData(waveByte, 0, waveByte.Length);
              }
  </code></pre>
  
  <p>but when I play the output file, the sound is only sizzle. Is my code is correct or what is wrong? </p>
  
  <p>If I set WaveFormat to WaveFormat(44100, 16, 1), it works fine.</p>
  
  <p>Thanks.</p>