I'm getting a clipping detected error, but I'm not quite sure why.
I set my pre-pro volume to my typical listening level. Then using Vista's volume mixer, I set the Realtek Digital Output Device slider to 100 and the REW Settings slider to 20. The Out and Right meters now read about -12db each.
Next I run Calibrate, which reads about 78.5db.
Next, Measure > Check Levels gives me a "Level OK" reading of -21db.
Then I run the measurement and get the clipping detected error box.
Am I doing something wrong? I have attached a sample measurement in case it helps.