amixer

AMIXER(1)                   General Commands Manual                  AMIXER(1)



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%


SEE ALSO
        alsamixer(1)


BUGS
       None known.


AUTHOR
       amixer is by Jaroslav Kysela <perex@perex.cz>.  This document is by
       Paul Winkler <zarmzarm@erols.com> and Jaroslav Kysela <perex@perex.cz>.



                                  11 Aug 2000                        AMIXER(1)