Tweens the volume of an object with a soundTransform property (MovieClip/SoundChannel/NetStream, etc.).
USAGE:
import com.greensock.TweenLite;
import com.greensock.plugins.TweenPlugin;
import com.greensock.plugins.VolumePlugin;
TweenPlugin.activate([VolumePlugin]); //activation is permanent in the SWF, so this line only needs to be run once.
TweenLite.to(mc, 1, {volume:0});
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