snd_ctl_make_virtual_master
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## 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).

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