Mixer
Sometimes the sound server PulseAudio is fighting a bit with Alsa (which is the interface standard for sound on our GNU / Linux). I notice it especially in our webs in Radio PhotoBook to achieve record the sound coming from your sound card or even properly capture the microphone input with some sound cards that are kept out fine in GNU / Linux. To resolve this, I use pavucontrol (PulseAudio Volume Control) cuisinart 12 cup food processor tap which can regulate different levels of input and output audio to and from different sources and destinations (cute huh?). Then we will see different tabs. Among them, we can regulate the level playing audio output of the various players in motion in an independent manner (as the output of a mixer with different sources playing). In the recording we can decide which font is the one to record, for example, Audacity, or the microphone, well what is playing on another source (a radio onlie can tune and record the source, for example). To me is helping to better manage digital sound card I have in the desktop PC and only with Alsa does strange things with the mic input. .