title: reading a wav file using scipy.io.wavfile and then writing doesn't reproduce the original file
body: <p>I am trying to work with wav files in Python.
  I downloaded the SciPy library which supposedly can do the job.
  To see that it works I'm trying to read a wav file and then write it again to disk.
  For some reason the new wav file that is created is not similar to the old one.</p>
  
  <pre><code>import scipy.io.wavfile as wav
  (rate,sample) = wav.read("/vocal.wav")
  wav.write("/temp.wav", rate, sample)
  </code></pre>