To configure , choose SettingsPreferences.
populates the Gnome Volume Control Preferences dialog dynamically, based on the functionality supported by your sound card.
Use the options in the Shown column to select the mixers that are displayed in the main  window.
vol
Select this option to display the faders that control the main volume.
pcm
Select this option to display the faders that control the wave files.
speaker
Select this option to display the fader that controls the speaker output jack.
line
Select this option to display the faders that control the line input on your sound card, if the sound card has a line input.
mic
Select this option to display the fader that controls the microphone input on your sound card.
cd
Select this option to display the faders that control the CD player input gain.
igain
Select this option to display the faders that control the volume level of the selected recording device.
line1
Select this option to display the faders that control the second line input on your sound card, if the sound card has a second line input.
phin
Select this option to display the fader that controls the volume of the phin device.
video
Select this option to display the faders that control the volume of the video devices.
To change a mixer label, double-click on the text in the Mixer label column, then enter the new label text.
To reset the mixer labels to the default values, click on the Reset labels to their defaults button.
