MACROMEDIA FLASH MX 2004-ACTIONSCRIPT LANGUAGE Reference page 459

var active_mic:Microphone = Microphone.get();
sound_mc.attachAudio(active_mic);
active_mic.onStatus = function(infoObj:Object) {
status_txt._visible = active_mic.muted;
muted_txt.htmlText = "Status: <a
href=\"asfunction:System.showSettings\"><u>"+infoObj.code+"</u></a>";
};
this.createTextField("status_txt", this.getNextHighestDepth(), 0, 0, 100, 22);
status_txt.html = true;
status_txt.autoSize = true;
status_txt.htmlText = "<font size='72' color='#FF0000'>muted</font>";
status_txt._x = (Stage.width-status_txt._width)/2;
status_txt._y = (Stage.height-status_txt._height)/2;
status_txt._visible = active_mic.muted;
See also
Microphone.get(), Microphone.muted
Microphone.onStatus 459