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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 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 (record-
	      ing) and muting for the group specified.

	      The  optional modifiers can be put as extra parameters to specify the stream direc-
	      tion 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)
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