Aggregate devices

Hi! I've been trying to set an aggregate audio device with built in audio, iMic and Soundflower (this one just for fooling the system). I wanted to see DVDs with 5.1, but that doesn't work. I configure everything ok. L and R speakers to Built in audio, Rear speakers to iMic and center and SW to Soundflower. Then i hook up speakers to each one of the outputs (except Soundflower) and play a DVD. But when i play the DVD i only get sound in front speakers (even when this is assigned to iMic). What am i doing wrong?
Thanks in advance
P.S. - I'm sure the DVD is 5.1

No one reply???

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