MIXERCTL(1)                OpenBSD Reference Manual                MIXERCTL(1)

NAME
     mixerctl - control audio mixing



SYNOPSIS
     mixerctl [-f file] [-n] [-v] -a
     mixerctl [-f file] [-n] [-v] name [...]
     mixerctl [-f 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 mix-
     erctl prints the current value of those variables for the specified de-
     vice.  If the -a flag is specified, all variables for the device are
     printed.  If the -w flag is specified mixerctl attempts to set the speci-
     fied variables to the given values.

     Values may be specified in either absolute or relative forms.  The rela-
     tive form is indicated by a prefix of ``+'' or ``-'' to denote an in-
     crease or decrease respectively.

     The -f 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 [] and set values are shown in {}.

     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
     The class can have values like inputs or outputs indicating that the con-
     trol affects the input resp. output to the mixer.  The 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.

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

FILES
     /dev/mixer  mixer audio device

ENVIRONMENT
     MIXERDEVICE  the mixer device to use.

SEE ALSO
     audioctl(1),  audio(4),  sysctl(8)

HISTORY
     The mixerctl command first appeared in NetBSD 1.3.


OpenBSD 2.6                       May 4, 1997                                2