ActionScript 3.0 :: Generating A Sine Wave And Playing It As A Sound?

I'm generating a sine wave and playing it as a sound. But When I call  SoundMixer.StopAll() it's causing a click when sounds stops. I think its because it's cutting the sound off in the middle of the wave, I was wondering of a way to make the sine wave slowly ripple out before i stop it. Is there already functions to do this in Action Script 3 or is my sine wave function i need to modify here is my code for the wave.
  
function sineWave(event:SampleDataEvent):void {       var sample:Number    for (var i:int=0; i<8192; i++)      {        sample = Math.sin((i+event.position) * ((2 * Math.PI)/44100) * freq); // freq is just any frequency        event.data.writeFloat(sample * .15);        event.data.writeFloat(sample * .15);     }    }