Applied to a single button. Frame 1 shows that sound is on, and frame 2 shows that it’s off.

sound_mc.buttonMode = true
sound_mc.addEventListener(MouseEvent.CLICK,toggleSound)

function toggleSound(e:MouseEvent){
	var tempMC:MovieClip = e.currentTarget as MovieClip
	var sTransform:SoundTransform = new SoundTransform(1,0);
	if(tempMC.currentFrame == 1){
		tempMC.gotoAndStop(2)
		sTransform.volume = 0;
	}else if(tempMC.currentFrame == 2){
		tempMC.gotoAndStop(1)
		sTransform.volume = 1;
	}
	SoundMixer.soundTransform = sTransform;
}

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