Take the tour ×  I have a sound source connected via line-in to
my computer. But when I change the master volume, only the
volume of sounds being played on the computer (e.g. media,
alerts, etc.) changes; the output volume of the line-in source
does not change. How do I control that?   To clarify, I don't
just want to control the line-in output volume, I want to
control the normal "output volume" from one control only, and I
want that to affect also the line in output volume. Something
like a "master volume" that would affect everything that comes
out of the sound card output.  The "master volume" I see when
running the command "alsamixer" only affects the sound that
comes from the main pc, not from the line in.  share|improve
this question add comment  1 Answer  have you tried the line-in-
control already ? Press Alt+F2 and type 'gnome-alsamixer'. You
should get a window with a lot of controls, called mixer, in
which you can adjust every single sound source.  P.S.: In
notebooks, but also in PCs with sound-on-