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 (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)
Opportunity
Personal Opportunity - Free software gives you access to billions of dollars of software at no cost. Use this software for your business, personal use or to develop a profitable skill. Access to source code provides access to a level of capabilities/information that companies protect though copyrights. Open source is a core component of the Internet and it is available to you. Leverage the billions of dollars in resources and capabilities to build a career, establish a business or change the world. The potential is endless for those who understand the opportunity.
Business Opportunity - Goldman Sachs, IBM and countless large corporations are leveraging open source to reduce costs, develop products and increase their bottom lines. Learn what these companies know about open source and how open source can give you the advantage.
Free Software
Free Software provides computer programs and capabilities at no cost but more importantly, it provides the freedom to run, edit, contribute to, and share the software. The importance of free software is a matter of access, not price. Software at no cost is a benefit but ownership rights to the software and source code is far more significant.
Free Office Software - The Libre Office suite provides top desktop productivity tools for free. This includes, a word processor, spreadsheet, presentation engine, drawing and flowcharting, database and math applications. Libre Office is available for Linux or Windows.
Free Books
The Free Books Library is a collection of thousands of the most popular public domain books in an online readable format. The collection includes great classical literature and more recent works where the U.S. copyright has expired. These books are yours to read and use without restrictions.
Source Code - Want to change a program or know how it works? Open Source provides the source code for its programs so that anyone can use, modify or learn how to write those programs themselves. Visit the GNU source code repositories to download the source.
Education
Study at Harvard, Stanford or MIT - Open edX provides free online courses from Harvard, MIT, Columbia, UC Berkeley and other top Universities. Hundreds of courses for almost all major subjects and course levels. Open edx also offers some paid courses and selected certifications.
Linux Manual Pages - A man or manual page is a form of software documentation found on Linux/Unix operating systems. Topics covered include computer programs (including library and system calls), formal standards and conventions, and even abstract concepts.
