Mute sound on timeline

We have a movie clip containing a set of sound files. All sound is on the timeline.   We have tried the following, but none works. Can anyone help? Thanks!
[ on the frame where the sound starts]
if (deactivate) {
   SoundMixer.stopAll();
or
[ first frame of movie clip]
var sndTransform:SoundTransform = new SoundTransform();
SoundMixer.soundTransform = sndTransform;
[ on the frame where the sound starts ]
if (deactivate) {
    sndTransform.volume = 0;
} else {
    sndTransform.volume = 1;

you movieclip has a soundTransform property you can use:
// if your code is on the parent timeline:
var st:SoundTransform=mc.soundTransform;
if(deactivate){
st.volume=0;
} else {
st.volume=1;
mc.soundTransform=st;
// if your code is on the movieclip's timeline, use "this" instead of mc

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