amixer man page on aLinux

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AMIXER(1)							     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  con‐
	      tents.

       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 decre‐
	      mented 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 play‐
	      back 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 compo‐
	      nents: 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 num‐
	      ber.

       -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 sequen‐
	      tially.  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.

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%

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)
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