(hasParent) ? parent.opacity : value;
The parent's opacity value acts as a multiplier for the child's
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
Fade a layer in and out using markers to set the duration
AfterEffects_Tricks
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