I like simple animation effects when I don’t have to tween each frame, like a chump. Here I am building a random “voice” animation.
AE_Sin_ani

  1. I created one tall rectangle shape with rounded corners.
  2. Under “Transform Rectangle”:
    1. I changed the Position so that each new copy of the Shape would move itself over a little.
    2. I changed the Scale so that each copy  would be at a different point on the Sin curve.

The finished product is pretty nice. I’m not going to post a video for a 24 frame loop… but here is what my page looks like:

AE_Sin