Merge pull request #294 from jeremybmerrill/patch-1

Add caveat about static in sound test file.

docs/installation/raspberrypi.rst

@@ -210,6 +210,10 @@ software packages, as Wheezy is going to be the next release of Debian.
 
        aplay /usr/share/sounds/alsa/Front_Center.wav
 
+   If you hear a voice saying "Front Center," then your sound is working. Don't 
+   be concerned if this test sound includes static, output from Mopidy will not.
+   Test your sound with gstreamer to determine sound quality.
+
    To make the change to analog output stick, you can add the ``amixer`` command
    to e.g. ``/etc/rc.local``, which will be executed when the system is
    booting.