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)