Default video sound is mute. But when i also can turn on from the volume bar.

Question

I use FLVPlayback from CS 4 to input videos.
I need default sound is mute, but I can turn it on  when I need it from volume bar.
Please see my attachement:
Here is the AS:
stop();
button1.addEventListener(MouseEvent.CLICK,clickListener1);
function clickListener1(event:MouseEvent):void {
    gotoAndStop("30sec");
button2.addEventListener(MouseEvent.CLICK,clickListener2);
function clickListener2(event:MouseEvent):void {
    gotoAndStop("30sec2");

Answer 1

Yes,  I can change the volume from 100 to 0 at flvplayback component. If I do this, I can not turn on the sound anymore. The swf file will stay mute all the time.
I need an answer using AS3 to control player. It is more flexible.
video player default is mute. I can turn on the sound later from volume bar.
thanks
silky