I'm using the code below to build a toolkit that allows the client to adjust the animation based on where they place the marker "GO." The layer has two keyframes, the client would adjust the marker to set when the animation would occur. This works great for two keyframes. So for simple motion like fade on, I would have two keyframes on opacity to fade on, they would animate as normal. For fade out, I would place two keyframes in effect>transform>opacity, the client would adjust the fade out keys using a marker. Essentially I'm separating opacity animation between the default opacity and effects>transform>opacity.
What I want to know is: is there a way to place all four keyframes on opacity and have the marker only controlling the second pair of keyframes?