Chase Back and Forth Pattern Examples and Possibilities
The numerals of the links below correlates to the number of tracks chasing.
Sequence Diagram Version A	Sequence Diagram Version B
2 3 4 5 6 7 8	2 3 4 5 6 7 8
Starts with Track 1 turning on and then off as Track 2 turns on, and then continues down to the Last Track, then chases backwards to Track 1.	Same as Version A, but has a delay at the beginning and the end.