Can't hear playback with USB audio interface plugged in

I start Logic Pro 8 and then plug in Lexicon Lambda for a USB interface between guitar and macbook pro. With the Lambda plugged in I hear nothing from mac or headphone input on Lambda. If I unplug Lambda I can hear playback from mac just fine thru speakers or headphones.
Very appreciative of any advice on how to solve this.
Thanks.

berkleyrob wrote:
I start Logic Pro 8 and then plug in Lexicon Lambda for a USB interface between guitar and macbook pro. With the Lambda plugged in I hear nothing from mac or headphone input on Lambda.
Unplug your audio interface, reboot the Mac, plug the USB interface in, let it be recognized. Open Audio/MIDI Setup (in utilities) see if the Lambda shows up as an input and output device.
Yes/No?
If yes, you don't have to select if for any of the Input/Outputs, Logic's audio interface selection operates independently from the system.
Open Logic go to "Preferences/Audio) select the Lexicon or Lambda interface as the default unit, set audio buffers to 256.
Anything yet.
All audio I/O will be coming from the lexicon the Mac's audio system is now out of the equation.
pancenter-

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