B-LOG

FreeBSDでコマンドラインからサウンドカードの音量を調整するには mixer コマンドを使う。

% mixer
Mixer vol      is currently set to   75:75
Mixer pcm      is currently set to  75:75
Mixer speaker  is currently set to  75:75
Mixer line     is currently set to  75:75
Mixer mic      is currently set to   0:0
Mixer cd       is currently set to  75:75
Mixer rec      is currently set to   0:0
Mixer igain    is currently set to   0:0
Mixer ogain    is currently set to  50:50
Mixer line1    is currently set to  75:75
Mixer phin     is currently set to   0:0
Mixer phout    is currently set to   0:0
Mixer video    is currently set to  75:75

で現在のパラメータが表示される。

% mixer <変更したいライン> <音量レベル>

で各ラインの音量を調整できる。

たとえば，

% mixer vol 10

とすると主音量が10になる。