Thanks for the image.
I did find this. I think there is not much control over the easing.
Or maybe I should say, I find it difficult to do what I want in FCX in that window.
I much prefer a keyframe based control on it's own timeline a bit like with AE where I visually see
what I am doing. I thought it would be in the animation window in the timeline.
You pull the bezier and you see the curve,
As I said this is me...incapable of doing properly with FCX !