I have a Logitech USB Headset and, also, desktop speakers connected to my sound card.  When my headset is connected, my speakers will not play.  Looking at the settings, I have a choice of Logitech USB Headset or SB Live! 24-bit as my default audio device.  
Is there a way to have sound through both speakers (connected to my sound card) and through my USB headset?  Or do I just unplug my headset whenever I want to use the speakers?
Thanks,
Gooss