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mixerctl from NetBSD, mostly by Lennart Augustsson <augustss@cs.chalmers.se>

.\" $NetBSD: mixerctl.1,v 1.4 1997/10/19 05:09:35 lukem Exp $
.\" Copyright (c) 1997 The NetBSD Foundation, Inc.
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.\" Author: Lennart Augustsson
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.Dd May 4, 1997
.Dt MIXERCTL 1
.Os
.Sh NAME
.Nm mixerctl
.Nd control audio mixing
.Sh SYNOPSIS
.Nm
.Op Fl f Ar file
.Op Fl n
.Op Fl v
.Fl a
.Nm ""
.Op Fl f Ar file
.Op Fl n
.Op Fl v
.Ar name ...
.Nm ""
.Op Fl f Ar file
.Op Fl n
.Fl w
.Ar name=value ...
.Sh DESCRIPTION
The 
.Nm
command displays or sets various audio system mixing variables.
If a list of variables is present on the command line, then
.Nm
prints the current value of those variables for the specified device.
If the 
.Fl a
flag is specified, all variables for the device are printed.
If the
.Fl w
flag is specified
.Nm
attempts to set the specified variables to the given values.
.Pp
The
.Fl f
flag can be used to give an alternative mixer device, the default is
.Pa /dev/mixer.
.Pp
The
.Fl n
flag suppresses printing of the variable name.
.Pp
The
.Fl v
flag shows the possible values of enumeration and set valued
variables.  Enumerated values are shown in [] and set values
are shown in {}.
.Sh FILES
.Bl -tag -width /dev/mixer
.It Pa /dev/mixer
mixer audio device
.El
.Sh SEE ALSO
.Xr audioctl 1 ,
.Xr audio 4 ,
.Xr sysctl 8
.Sh HISTORY
The
.Nm
command first appeared in
.Nx 1.3 .