This example illustrates how to make Christmas lights chase using a 3 track lighting controller. Chase Lights Diagram
Fig 1. Three separate strands of lights are laid out next to each other.
The lights are 1 foot on center. The three strands are offset 4 inches and wire tied together.

Fig 2 is a completed set of chase lights.
The example animation below shows the turn on sequence.

Note: It is usually best to use the same color bulbs for chase lights. We used different color bulbs to make the example more obvious.