To set the default sound in Windows to your audio device,
1. Locate and right click on the small speaker ICON on your desk top directly to the left of your time.
2. Select "Playback Devices".
3. Under the Playback tab, please highlight the PreSonus audio device you are using and then click "Set Default" below. This will set your device as the default device for your sound on your PC. Your PC will now use the PreSonus device as the default device, so iTunes, Windows Media player or YouTube will now use your interface for playback.
Alternatively, you can use this method on Windows 7 and Windows 8:
1. Press the Windows key + R on the keyboard. In the Run prompt, type "mmsys.cpl" and then click OK.
2. Under the Playback tab, please highlight the PreSonus audio device which you are using and then click "Set Default" below. Your PC will now use the PreSonus device as the default device, so iTunes, Windows Media player or YouTube will now use your interface for playback.
3. Click OK