Audio output through laptop docking station not working

Audio output through laptop docking station is not working. When my laptop is in the docking station the audio only plays through the laptop speakers and not through the speakers I have plugged into the docking station. I don't think it's a gstreamer issue because when I run the following command "gst-launch-0.10 playbin uri=<file>" the sound comes out of both docking station speakers and the laptop speakers fine. Does anyone know how I can get Songbird to play through the docking station speakers?

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