Yamaha DTXpress/DTXplorer/DTXtreme

Hey guys,

Quick question (I hope):  I have connected my DTXPressII to my PC 
via the MIDI cable to my computer's sound card (joystick port).  I 
can record my drums fine through Cakewalk 3.  My issue is that I can 
only hear my recordings played back through my headphones.  The 
sound is running itself back through my DTX brain rather than 
straight to my computer speakers.  I'd like to be able to hear what 
I've done through my computer speakers rather than through my drum 
module.

I'm sure it's just a simple button click, but I have yet to find 
it.  Any suggestions you might have would be appreciated!

Thanks
-M