Next, create a new keyframe in the timeline of your movie and label it Move_x. Add this script to the keyframe:

Then I modified the code in the Move_all keyframe so that it changes the properties of the parent clip denoted by the variable target.

x = getProperty(target,_x);
x_speed=(1-damp)*x_speed—(x—x_def)*stiff + brown*(random(20)-10)/10;
x = x + x_speed;
setProperty(target,_x)=x;

Note that only the first and last lines have changed.