'\" t
.\"     Title: snd_ctl_add_slave
.\"    Author: [FIXME: author] [see http://docbook.sf.net/el/author]
.\" Generator: DocBook XSL Stylesheets v1.79.1 <http://docbook.sf.net/>
.\"      Date: April 2019
.\"    Manual: Control/Mixer API
.\"    Source: Kernel Hackers Manual 4.9.168
.\"  Language: English
.\"
.TH "SND_CTL_ADD_SLAVE" "9" "April 2019" "Kernel Hackers Manual 4\&.9\&." "Control/Mixer API"
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.SH "NAME"
snd_ctl_add_slave \- Add a virtual slave control
.SH "SYNOPSIS"
.HP \w'int\ snd_ctl_add_slave('u
.BI "int snd_ctl_add_slave(struct\ snd_kcontrol\ *\ " "master" ", struct\ snd_kcontrol\ *\ " "slave" ");"
.SH "ARGUMENTS"
.PP
\fImaster\fR
.RS 4
vmaster element
.RE
.PP
\fIslave\fR
.RS 4
slave element to add
.RE
.SH "DESCRIPTION"
.PP
Add a virtual slave control to the given master element created via
\fBsnd_ctl_create_virtual_master\fR
beforehand\&.
.PP
All slaves must be the same type (returning the same information via info callback)\&. The function doesn\*(Aqt check it, so it\*(Aqs your responsibility\&.
.PP
Also, some additional limitations: at most two channels, logarithmic volume control (dB level) thus no linear volume, master can only attenuate the volume without gain
.SH "RETURN"
.PP
Zero if successful or a negative error code\&.
.SH "COPYRIGHT"
.br