snd_ctl_add_vmaster_hook
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## Name

snd_ctl_add_vmaster_hook — Add a hook to a vmaster control

## Synopsis

`int snd_ctl_add_vmaster_hook (` | struct snd_kcontrol * kcontrol,
| void (*hook) `(`void *private_data, int`)`,
| void * private_data`)`;

## Arguments

`kcontrol`

  vmaster kctl element

`hook`

  the hook function

`private_data`

  the private_data pointer to be saved

## Description

Adds the given hook to the vmaster control element so that it's called at each time when the value is changed.

## Return

Zero.

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