mixer(8) is a FreeBSD base system utility for setting and displaying sound card mixer levels. It resembles the Linux’s command line utility alsamixer. Invoked with no parameters it shows the current values of the mixer devices:
$ mixer
Mixer vol is currently set to 85:85
Mixer pcm is currently set to 75:75
Mixer speaker is currently set to 75:75
Mixer mic is currently set to 0:0
Mixer mix is currently set to 0:0
Mixer rec is currently set to 75:75
Mixer igain is currently set to 75:75
Mixer monitor is currently set to 75:75
Recording source: mic
Setting specific values is easy enough:
$ mixer rec 80:80
Setting the mixer rec from 75:75 to 80:80.
Enjoy!
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