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L7 Pro Audio Input/output Problem

Hello,

Logic Pro newbie so please bear with me.

I'm having trouble with my audio input/output set up in logic pro 7. My input device is a Tascam US-122 USB audio/midi interface. The problem I'm having is getting Logic to accept it as the input device while at the same time outputing sound to my apple line-out speakers.

In the logic audio preference panel, if i set the core audio device to my Tascam box I can record my guitar but can't hear it. If i switch core audio to "Built-in Audio" I can hear the playback but no longer record.

In GarageBand the audio preference setup is very clear because it has two selections. One for input device and one for output device. In Logic it's not so clear and I can't get it to work.

In my system preferences I have the Tascam box selected as the audio input device and built-in audio as the ouput. This has always been the case and the setup worked fine in GarageBand. No problems playing my guitar or MIDI keyboard through the Tascam box.

Please help