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)