I have 2 problems:
1.I want to use your code with other properties. Ex. Shape and Mask (like this picture), but it always show error occurred at line 4. I think I was the wrong path.
2. I had 12 keyframes.
– If I start with “k1=2”, after I’m increased slider, then keyframes: 3,4,5,6,7,8,9,10,11,12 also increase value of the slider. I only want it to affect keyframes:11, k12
– If I start with “k1=10” then the time of motion begins at keyframe 10 while I want it to start at keyframe 2. I don’t want it affect to keyframe 3->10

