snd_ctl_make_virtual_master(9) centos man page | unix.com

SND_CTL_MAKE_VIRTUAL(9) 					 Control/Mixer API					   SND_CTL_MAKE_VIRTUAL(9)

NAME
       snd_ctl_make_virtual_master - Create a virtual master control

SYNOPSIS
       struct snd_kcontrol * snd_ctl_make_virtual_master(char * name, const unsigned int * tlv);

ARGUMENTS
       name
	   name string of the control element to create

       tlv
	   optional TLV int array for dB information

DESCRIPTION
       Creates a virtual master control with the given name string.

       After creating a vmaster element, you can add the slave controls via snd_ctl_add_slave or snd_ctl_add_slave_uncached.

       The optional argument tlv can be used to specify the TLV information for dB scale of the master control. It should be a single element with
       #SNDRV_CTL_TLVT_DB_SCALE, #SNDRV_CTL_TLV_DB_MINMAX or #SNDRV_CTL_TLVT_DB_MINMAX_MUTE type, and should be the max 0dB.

RETURN
       The created control element, or NULL for errors (ENOMEM).

COPYRIGHT
Kernel Hackers Manual 3.10					     June 2014						   SND_CTL_MAKE_VIRTUAL(9)