amixer is a command-line mixer for ALSA(Advanced Linux Sound Architecture) sound-card driver. amixer can support multiple soundcards. amixer with no arguments will display the current mixer settings for the default soundcard as well as the device. This is a good way to see a list of the simple mixer controls that you can use.
Syntax:
amixer [-option] [command]
Commands and Options:
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-h or –help : Displays help and then exits.
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–info : Displays the info and then exits.
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–scontols : Displays a complete list of simple controls and then exits.
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–scontents : Shows a complete list of simple mixer controls and their contents as well.
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set or sset : Sets the contents of the simple mixer.
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get or sget : Shows the control contents of the simple mixer.
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controls : Displays a complete list of the card controls.
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contents : Displays a complete list of the card controls with their contents as well.
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cset : Is used to set the card controls.
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cget : It shows the card control contents. The identifier has the same syntax as for the cset command.
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-c : Selects the card number that needs to be controlled.
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-D : Selects the device name that needs to be controlled.
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-s or –stdin : Read from stdin and execute each command sequentially.
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-q : Does not display the result of the changes.
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-R : Uses the raw value for evaluating the percentage representation which is also the default mode.
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-M : Uses the mapped volume for evaluating the percentage representation like alsamixer, to be more natural for the human ear.
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-v : Displays the version.