|Be sure to NOT change the selectionbox in the top-left corner
for Key. This must be set to C, otherwise you will not get proper results!
Further set the audio properties on your PC in the right way:
If this is done properly the program shows in the left pane how loud the
sound is that enters the system. If this green bar does not move, no sound
enters the system/program. The bar should enter the blue area for a correct
Open Volume Control
The program also shows in which octave the key is. In the
example the D is in the third measurable octave.