Mute single frame of audio

Hi all,

I'm a novice Flash user so bare with me, i'm trying to mute a single layer of Audio when a button is clicked.

The idea being that some of the audio will continue to play throughout the Animation but when the button is clicked the main audio (backing music) will be muted/disabled.

So does anyone know some script to Disable a specific layer or mute a layers sound?

I'm working in a AIR for IOS document, using ActionScript 3 in Flash Pro CC.

Any help is much appreciated.

Thank you.