Update the expression with below codes to start and stop the wiggle effect at a specific time. Here comes the fun part, the basic wiggle expression will wiggle the layer for the entire duration. Delete transform.position from the text area and type in the wiggle expression.And I think once you’ve thought that you wanted to loop only specific keyframes like an image above. You mographers probably use a simple loop expression, loopOut(). You now should be able to type into a text field in your timeline. After Effects Tips: Loop With Expression.