I am using Trisquel GNU/Linux 6.0.1 (a modified version of Ubuntu) on the XFCE desktop environment. I am trying to record the output of my speakers. I do not have a microphone, and so cannot use it for this purpose (and I don't want to, anyways, due to the loss of quality).Yet no matter what program I use (I have tried with many different programs including Audacity, RecordMyDesktop, GNOME Sound Recorder, and parec), PulseAudio volume control shows that the running program is not detecting any input, and the resulting files contain no audio. It is definitely set to monitor of built-in analog stereo.In case it's relevant, the output of arecord -l is**** List of CAPTURE Hardware Devices ****card 0: SB [HDA ATI SB], device 0: ALC270 Analog [ALC270 Analog]  Subdevices: 1/1  Subdevice #0: subdevice #0Audacity shows this device as a recording option, but using it as input produces the same null results.
What is preventing me from recording the output of my speakers?
audio;pulseaudio;recording;trisquel
@eyoung100's comments helped me find the solution on my own. In PulseAudio volume control's Input Devices tab, ensure that Monitor of Built-in Analog Stereo is not muted.