y=value[1]-sourceRectAtTime(time).height/2;[0,y]
y=value[1]-sourceRectAtTime(time).height/2; [0,y]
Apply this expression to the property you want to control (like opacity) and make sure it is referencing the correct control layer.
Use a slider control to delay keyframe animation by a defined amount of seconds. Works like a marker trigger, but simpler. Useful for MOGRTs
Inherits opacity from parent but retains the child's editabilty
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