Planarchist has some good points. What I meant with checking the input as Windows recording source, was to see if the interface does send it to Windows - and that way leave Cubase out of it for troubleshooting. Check ‘Sound’ from Windows configurations and select the ‘Recording’ tab. If you there select the MotU ASIO and send some sound into it, Windows should show (and play) that audio. If that is correct, your problem is within Cubase and its settings.