Manual: amixer

AMIXER(1)					   General Commands Manual					   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   ...
	      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 before the value to	 specify  the  stream  direction  or
	      channels to apply.  The modifiers playback and capture specify the stream, and the modifiers front, frontleft,
	      frontright, frontcenter, center, rear, rearright, rearleft, 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 
	      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   ...
	      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 
	      Shows the card control contents. The identifier has same syntax as for the cset command.

ADVANCED COMMANDS
       sevents
	      Shows the events for the simple mixer controls.

       events Shows the events for the mixer controls.

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 with‐
	      out 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	 hu‐
	      man 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 se‐
	      lect 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 .  This document is by Paul Winkler  and Jaroslav
       Kysela .

							 11 Aug 2000						   AMIXER(1)