Thanks Gary and Ted.
Your suggestions pointed me into the right direction. I knew it had to be something simple. I discovered a Windows control that I hadn’t ever seen before: “Recording Control”. All I had to do was select “Line In” and I was good to go.
Damn, that noise floor is high, about -50 dBm. Since today’s project is for my daughter’s science fair project, I won’t worry about it, but it’s definitely time to look at a better input device.
That’s another thread, however.