Ubuntu: recording internal audio

• Install pavucontrol (PulseAudio Volume Control) using apt-get or the Ubuntu Software Center.
• Open PulseAudio Volume Control. It should be in the applications menu under Sound and Video.
• Open Sound Recorder and start recording. Playing any sound at this point would be helpful, as your level indicator should react once you have finished.
• Go to the "Recording" tab in the PulseAudio Volume Control window.
• Make sure that "Applications" is selected in the drop down menu on the "Recording" tab.
• Choose "Monitor of Internal Audio Analog Atereo" from the "Record Stream from" menu in the Sound Recorder entry of the application list.