y=value[1]-sourceRectAtTime(time).height/2;[0,y]
y=value[1]-sourceRectAtTime(time).height/2; [0,y]
Alternate opacity with the opacity of another layer.
Wiggle randomly between two values.
Control the opacity of a layer by the dropdown menu selection. Add a Number [1,2,3,etc] to the beginning of layer to make it work
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