MIXERCTL(1)

NAME
mixerctl - control audio mixing

SYNOPSIS
mixerctl [-f file] [-n] [-v] -a
[-f file] [-n] [-v] name ...
[-f 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 -f flag can be used to give an alternative mixer device, the default is /dev/mixer0.

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 [] 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 control affects the input resp. output to the mixer. The name indicates what part of the mixer the control affects. Continous 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 commmand
    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/mixer0
    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.