No output when using a USB interface / real instrument or mic

Hi, I'm a Logic noob. I can get input and output from software instruments, but when I'm using my interface for my guitar or mic, I don't get any output. I can tell I'm getting input because the input bars jump around when I play, but I just can't seem to get any sound. I've searched through a couple other threads, but they seem to address changing output to hear during recording. Any advice?
Thanks
MacBook
M-Audio Fast Track USB interface
Creative monitors plugged into MacBook

When you select the M-Audio as audio hardware the Output goes to it!
If you want to use Mac internal audio then open the Audio Midi Setup (it's in the utility folder) and create an aggregate device.
cheers
rob

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Attachments:
CAN_PROBLEM.vi ‏16 KB
ReceiveAndRespond.vi ‏17 KB
CAN INIT.vi ‏23 KB

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No output when using a USB interface / real instrument or mic

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