title: iPhone iOS6 audio crashing
body: <p>We have start to noticing some weird audio bugs for some users after they updated to iOS6. 
  We are using the <code>MPMusicPlayerController</code> and some other core audio features. Anyone else experienced something similar? Console log snippet:</p>
  
  <pre><code>Sep 30 23:14:43 JMS-iPhone mediaserverd[37] &lt;Notice&gt;: &gt;vad&lt; ERROR:    23:14:43.712 [tid 0x2ff6f000] VirtualStream.cpp[465]: GetCurrentFormats(): Error 'what' getting virtual format for actual format [ 16/44100/1; flags: 0x44; bytes/packet: 4; frames/packet: 1; bytes/frame: 4;  ]
  Sep 30 23:14:43 JMS-iPhone mediaserverd[37] &lt;Notice&gt;: &gt;vad&lt; EXCEPTION: 23:14:43.718 [tid 0x2ff6f000] VirtualStream.cpp[369]: GetPropertyData(): result: "error getting current stream format"
  Sep 30 23:14:43 JMS-iPhone mediaserverd[37] &lt;Notice&gt;: &gt;vad&lt; ERROR:    23:14:43.731 [tid 0x2ff6f000] VirtualStream.cpp[465]: GetCurrentFormats(): Error 'what' getting virtual format for actual format [ 16/44100/1; flags: 0x44; bytes/packet: 4; frames/packet: 1; bytes/frame: 4;  ]
  Sep 30 23:14:43 JMS-iPhone mediaserverd[37] &lt;Notice&gt;: &gt;vad&lt; ERROR:    23:14:43.738 [tid 0x2ff6f000] VirtualAudio_Stream.cpp[411]: UpdatePhysicalFormat(): error 'what' getting underlying stream format
  Sep 30 23:14:43 JMS-iPhone Application[3009] &lt;Warning&gt;: [DB] phone volume changed to: 1.000000
  Sep 30 23:14:43 JMS-iPhone mediaserverd[37] &lt;Notice&gt;: &gt;vad&lt; ERROR:    23:14:43.858 [tid 0x3265000] VirtualStream.cpp[465]: GetCurrentFormats(): Error 'what' getting virtual format for actual format [ 16/44100/1; flags: 0x44; bytes/packet: 4; frames/packet: 1; bytes/frame: 4;  ]
  Sep 30 23:14:43 JMS-iPhone mediaserverd[37] &lt;Notice&gt;: &gt;vad&lt; EXCEPTION: 23:14:43.863 [tid 0x3265000] AggregateDevice_Common.cpp[1204]: UpdateIOProcCache(): result: "Stream::GetCurrentFormat() returned an error."
  Sep 30 23:14:43 JMS-iPhone mediaserverd[37] &lt;Notice&gt;: &gt;vad&lt; EXCEPTION: 23:14:43.867 [tid 0x3265000] VirtualAudio_Device.cpp[2186]: StartIOEngine(): theError: "error starting IO on the active device"
  Sep 30 23:14:43 JMS-iPhone mediaserverd[37] &lt;Error&gt;: 23:14:43.870 &lt;AudioControl&gt; AQMEIO_Base::DoStartIO: error 2003329396
  Sep 30 23:14:43 JMS-iPhone mediaserverd[37] &lt;Error&gt;: 23:14:43.872 &lt;AudioControl&gt; AQMEDevice(0x1ea4e000)::StartIO: error 2003329396
  </code></pre>