title: How to use "kAudioUnitSubType_VoiceProcessingIO" subtype of core audio API in mac os?
body: <p>I'm finding an example of simple play-thru application using built-in mic/speaker with <strong>kAudioUnitSubType_VoiceProcessingIO</strong> subtype(not kAudioUnitSubType_HALOutput) in macosx. The comments on the core audio api says that kAudioUnitSubType_VoiceProcessingIO is available on the desktop and with iPhone 3.0 or greater, so I think that there must be an example somewhere for macos.</p>
  
  <p>Do you have any idea where the sample is? or Is there anyone who know how to use the kAudioUnitSubType_VoiceProcessingIO subtype in macos? I already tried the same way that I did in iOS, but it didn't work.</p>