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Re:About the OS X Yosemite v10.10.4 Update by freshyill on Tuesday June 30, 2015 @12:09PM (#9806294)
Unless I'm misunderstanding your audio problem, you can choose the output device by option clicking the volume in the menu bar. You'll get this: http://i.imgur.com/tvkWjqW.png

The same setting is also available through the Sound pane in the System Preferences.

Re:About the OS X Yosemite v10.10.4 Update by vito on Tuesday June 30, 2015 @12:13PM (#9806321)
Tried that every time, and it had no effect. Both devices would show up but it'd send audio through the laptop regardless.
Re:About the OS X Yosemite v10.10.4 Update by nkrumm on Tuesday June 30, 2015 @12:25PM (#9806410)
I've found a fast way to 'reset' the audio ins/outs is with `sudo pkill coreaudiod`-- stops audio for 1 second but I can always get the right device selected afterwards.
Re:About the OS X Yosemite v10.10.4 Update by sogen on Tuesday June 30, 2015 @01:46PM (#9807090)
the crappy audio is a yosemite bug