Provided by: alsa-utils_1.0.27.2-1ubuntu2_i386 bug

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)