AU Lab won't output to my headphones

Hello,
I have installed Sunflower + AU lab to get the equalizer on my MacBook Pro with external Mac Display speakers. But when I plug in headphones in the laptop (headphone port, not USB), I cannot find how to output AU lab to the headphones. Changing "output" to "Built-in output" does not work, and the other options are the External display.
How to do it?
Thanks a lot!

Does anything show when booting up?
When starting in Safe Mode?
OS X: What is Safe Boot, Safe Mode?
When booting to Recovery?
OS X: About OS X Recovery
If still problem, make an appointment at the Genius Bar of an Apple store since it appears you have a hardware problem.
  Apple Retail Store - Genius Bar

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