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This is the command amixer that can be run in the OnWorks free hosting provider using one of our multiple free online workstations such as Ubuntu Online, Fedora Online, Windows online emulator or MAC OS online emulator

PROGRAM:

NAME


amixer - command-line mixer for ALSA soundcard driver

SYNOPSIS


amixer [-option] [cmd]

DESCRIPTION


amixer allows command-line control of the mixer for the ALSA soundcard driver. amixer
supports multiple soundcards.

amixer with no arguments will display the current mixer settings for the default soundcard
and device. This is a good way to see a list of the simple mixer controls you can use.

COMMANDS


help Shows syntax.

info Shows the information about a mixer device.

scontrols
Shows a complete list of simple mixer controls.

scontents
Shows a complete list of simple mixer controls with their contents.

set or sset <SCONTROL> <PARAMETER> ...
Sets the simple mixer control contents. The parameter can be the volume either as a
percentage from 0% to 100% with % suffix, a dB gain with dB suffix (like -12.5dB),
or an exact hardware value. The dB gain can be used only for the mixer elements
with available dB information. When plus(+) or minus(-) letter is appended after
volume value, the volume is incremented or decremented from the current value,
respectively.

The parameters cap, nocap, mute, unmute, toggle are used to change capture
(recording) and muting for the group specified.

The optional modifiers can be put as extra parameters to specify the stream
direction or channels to apply. The modifiers playback and capture specify the
stream, and the modifiers front, rear, center, woofer are used to specify channels
to be changed.

A simple mixer control must be specified. Only one device can be controlled at a
time.

get or sget <SCONTROL>
Shows the simple mixer control contents.

A simple mixer control must be specified. Only one device can be controlled at a
time.

controls
Shows a complete list of card controls.

contents
Shows a complete list of card controls with their contents.

cset <CONTROL> <PARAMETER> ...
Sets the card control contents. The identifier has these components: iface, name,
index, device, subdevice, numid. The next argument specifies the value of control.

cget <CONTROL>
Shows the card control contents. The identifier has same syntax as for the cset
command.

OPTIONS


-c card

Select the card number to control. The device name created from this parameter has
syntax 'hw:N' where N is specified card number.

-D device

Select the device name to control. The default control name is 'default'.

-s | --stdin

Read from stdin and execute the command on each line sequentially. When this
option is given, the command in command-line arguments is ignored.

Only sset and cset are accepted. Other commands are ignored. The commands to
unmatched ids are ignored without errors too.

-h Help: show syntax.

-q Quiet mode. Do not show results of changes.

-R Use the raw value for evaluating the percentage representation. This is the
default mode.

-M Use the mapped volume for evaluating the percentage representation like alsamixer,
to be more natural for human ear.

EXAMPLES


amixer -c 1 sset Line,0 80%,40% unmute cap
will set the second soundcard's left line input volume to 80% and right line input
to 40%, unmute it, and select it as a source for capture (recording).

amixer -c 1 -- sset Master playback -20dB
will set the master volume of the second card to -20dB. If the master has multiple
channels, all channels are set to the same value.

amixer -c 1 set PCM 2dB+
will increase the PCM volume of the second card with 2dB. When both playback and
capture volumes exist, this is applied to both volumes.

amixer -c 2 cset iface=MIXER,name='Line Playback Volume",index=1 40%
will set the third soundcard's second line playback volume(s) to 40%

amixer -c 2 cset numid=34 40%
will set the 34th soundcard element to 40%

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