Thanks Mitch,
I think the program automatically mutes everything except WAVE and MASTER if you pick "Line In" and "Speaker" from the REW main screen in the lower left. I tried that, I also tried unchecking Mute for Line In, Mic, Synth, etc.. and cranking those levels up and nothing, until I went into the sound properties and added the levels for "front" and "sub" in Windows. The soundcard test worked fine and I didn't have any errors.
Before, when I had my SPDIF Coax hooked up from the pc to receiver the sound was being routed throught that, not the left/right RCA cables that I had hooked up to an extra Audio In connection. When it was that way, I did get an error during the soundcard test, something about the 1KHZ signal was not detected. That seems to be fixed now.
My goal in all of this is to graph my room response, add additional bass traps and reflection treatments, and also play around with various sub placements in the room to get as flat response as possible. Prior to finding this tool, I used the RealTraps CD to manually graph my room before/after the bass traps and I did see some dramatic improvements. This application you can just sit back and watch it plot your graph for you, much faster.
