MIXERCTL(1)             NetBSD 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 vari-
     ables.  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 spec-
     ified 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 vari-
     ables.  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 controls, these oper-
     ators toggle between on and off.

     The operators += and -= change the value of a mixer control by the indi-
     cated 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

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

HISTORY
     The mixerctl command first appeared in NetBSD 1.3.

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

NetBSD 5.0_STABLE               August 15, 2008              NetBSD 5.0_STABLE
