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NetBSD 6.1.5 - man page for mixerctl (netbsd section 1)

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MIXERCTL(1)			   BSD General Commands Manual			      MIXERCTL(1)

NAME
     mixerctl -- control audio mixing

SYNOPSIS
     mixerctl [-d file] [-n] [-v] -a
     mixerctl [-d file] [-n] [-v] name ...
     mixerctl [-d file] [-n] -w name=value ...
     mixerctl [-d file] [-n] -w name++ ...
     mixerctl [-d file] [-n] -w name-- ...
     mixerctl [-d file] [-n] -w name+=value ...
     mixerctl [-d file] [-n] -w name-=value ...

DESCRIPTION
     The mixerctl command displays or sets various audio system mixing variables.  If a list of
     variables is present on the command line, then mixerctl prints the current value of those
     variables for the specified device.  If the -a flag is specified, all variables for the
     device are printed.  If the -w flag is specified, mixerctl attempts to set the specified
     variables to the given values.

     The -d flag can be used to give an alternative mixer device.  The default is /dev/mixer.

     The -n flag suppresses printing of the variable name.

     The -v flag shows the possible values of enumeration and set valued variables.  Enumerated
     values are shown in brackets (``[]'') and set values are shown in curly braces (``{}'').

     The exact set of controls that can be manipulated depends on the mixer.  The general format
     (in both getting and setting a value) is
     class.name = value
     class can have values like inputs or outputs, indicating that the control affects the input
     or output of the mixer, respectively.  name indicates what part of the mixer the control
     affects.  Continuous mixer values, e.g., volume, have numeric values in the range 0-255.  If
     value can be set for each channel independently, the values are printed separated by commas.
     Discrete mixer values, e.g., the recording source, have symbolic names.  Depending on the
     mixer it may either be an enumeration or a set.

     The suffixes ++ and -- can be used to step through the values of a mixer control.	For
     numeric controls, these operators increase or decrease, respectively, the value by an amount
     (the delta) suitable to make the control assume the next possible value.  For binary con-
     trols, these operators toggle between on and off.

     The operators += and -= change the value of a mixer control by the indicated number of
     steps.

ENVIRONMENT
     MIXERDEVICE  the mixer device to use.

FILES
     /dev/mixer 	 mixer audio device
     /etc/mixerctl.conf  mixer configuration file

EXAMPLES
     The command
	   mixerctl -a -v
     can produce

     inputs.mic=0,0 volume
     inputs.mic.mute=off  [ off on ]
     inputs.cd=220,220 volume
     inputs.cd.mute=off  [ off on ]
     inputs.dac=220,220 volume
     inputs.dac.mute=off  [ off on ]
     record.record=220,220 volume
     record.record.source=mic  [ mic cd dac ]
     monitor.monitor=0 volume

COMPATIBILITY
     The old -f flag is still supported.  This support will be removed eventually.

SEE ALSO
     audioctl(1), audio(4), mixerctl.conf(5), sysctl(8)

HISTORY
     The mixerctl command first appeared in NetBSD 1.3.

BSD					 August 15, 2008				      BSD
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