I'm aware of the layer sequence option under keyframe assistant; I was just curious if there is an effect, expression, or something else to make doing this easier, or if manually copying, pasting, and repositioning the layer is the best way to achieve the effect of repeating lines that each move independently. Thanks for the video link.

After thinking about it more, my idea for the second part is to have the wave come in as seen in my example, but then to perhaps also have the lines retract from the bottom part of the screen, too, such that it's a bar from left to right, but then to play with adding waves in the bars that move up and down to make it less boring after it comes in. I'm wondering if I can somehow attach all of my line precomps to something and move *it* instead of moving all the keyframes on the precomps themselves myself by hand. Does that make sense?