Hi there,
I'm using a 
PreSonus Firepod as my one and only soundcard.  I have an 
AMD X2 5000+ and 
2GB of RAM.  I thought that would be enough to record audio in Sony Vegas.  When I record a track of audio while simultaneously monitoring that same track I hear a tremendous amount of distortion, crackles, and pops.  When I play back the recorded audio it sounds perfect, so the distortion seems to have come from the monitoring.  This leads me to believe that I have incorrectly configured 
Sony Vegas to work with my 
PreSonus Firepod.  Here is a screenshot of my current 
Audio Device settings in that tab under 
Options > Preferences:
http://madison.thewikies.com/forums/my-audio-device-settings.png
Before playing around myself, I thought I would ask the forums.