Thanks Doc. I just got your response today and haven't tried that yet, but, something popped in my mind. Since I'm connecting the output of the Pod to the return of my effects loop, will bypassing the Marshall pre-amp change the sound?? Or should I connect the Pod to the Marshall's input to use it this way?

And if I connect the Pod to the Marshall's input, will that be like using 2 pre-amps? Or does turning the gain all the way down on the tube pre-amp setting make it a line level signal?