title: HAL - how to monitor audio output on a mac
body: <p>There is an application called wiretap available at<br>
  <a href="http://www.ambrosiasw.com/utilities/wiretap/" rel="nofollow noreferrer">http://www.ambrosiasw.com/utilities/wiretap/</a></p>
  
  <p>This application can record the system audio.  I would like to be able to do the same in my program.  Any insights on what I need to do this?  I am familiar with Core Audio but havent found anything on how to do this. <br></p>
  
  <p>would this help getting the answer? I entered the command line: ioreg -w0 -l | grep io |more  <br>
  this is what I found aboud wiretap....there might be more related info close to where i found it:<br>
  +-o com_AmbrosiaSW_AudioSupport  &lt;class com_AmbrosiaSW_AudioSupport, registered, matched, active, busy 0, retain 4 &gt;<br>
  "CFBundleIdentifier" = "com.AmbrosiaSW.AudioSupport"<br>
  "IOMatchCategory" = "com_AmbrosiaSW_AudioSupport"<br>
  "version" = 2 <br>
  "IOClass" = "com_AmbrosiaSW_AudioSupport"<br>
  yan-bellavances-mac-mini:~ ybellavance$ ioreg -w0 -l | grep io |more
  </p>