Open the monitor tool in stand alone. You can find this in your start menu (Otoconsult folder).
Go to the settings and adjust the processing to DB SPL.
Play the calibration signal of your own test with a media player through the U24XL audio sound card.
Change the volume of the media player until it reaches the preferred level in the monitor tool.
Now you have calibrated your system to play another test in the otocube.
Be sure to to put your media player to the correct volume when you want to perform this test.