

Duplicate the spectrum layer and turn off the audio of this duplicate.Go to Effect > Generate > Gradient Ramp.Create a new solid and drag it below the spectrum.Select all the layers, right-click, and Precompose.Repeat this process again, and increase the Maximum Height of this third layer to 1400.Change the Inside and Outside Colors to something different than the previous spectrum.Duplicate the layer and move the second layer below the first one.Adjust Side Options to Side A to make the audio spectrum move upwards only.

Change Maximum Height to 400 and Audio Duration to 130.

