Apogee Duet: Pls help with aggregate device

[bezo]

I am trying to use mac's built-in audio as part of an aggregate for the separate headphone out so i can monitor a vocalist. I am having no luck at all followng the instructions in the help menu.

I added a device from Audio>open agregate....>click plus sign> checked my duet and built in output>chose duet a master clock source. And I can not hear anything coming out the Mac headphone output. Please help I need to record in the next hour and I dont want to use my m-audio.


Thanks