title: Unknown PCM cards.pcm.rear (pyaudio)
body: <p>The question is related to this <a href="https://github.com/jiaaro/pydub/issues/110#issuecomment-124205306" rel="noreferrer">pydub-Issue</a>. They told me the error message is related to pyaudio.</p>
  
  <pre><code>#!/usr/bin/env python3
  
  import pydub, pydub.playback
  
  wav = pydub.AudioSegment.from_wav('/home/user/complete.wav')
  pydub.playback.play(wav)
  </code></pre>
  
  <p>This code raise that errors I don't understand.</p>
  
  <pre><code>ALSA lib pcm.c:2239:(snd_pcm_open_noupdate) Unknown PCM cards.pcm.rear
  ALSA lib pcm.c:2239:(snd_pcm_open_noupdate) Unknown PCM cards.pcm.center_lfe
  ALSA lib pcm.c:2239:(snd_pcm_open_noupdate) Unknown PCM cards.pcm.side
  bt_audio_service_open: connect() failed: Connection refused (111)
  bt_audio_service_open: connect() failed: Connection refused (111)
  bt_audio_service_open: connect() failed: Connection refused (111)
  bt_audio_service_open: connect() failed: Connection refused (111)
  Cannot connect to server socket err = No such file or directory
  Cannot connect to server request channel
  jack server is not running or cannot be started
  </code></pre>
  
  <p>The wav itself is played well. How can I prevent that errors.</p>