Chaser light controllers turn on one track at a time.
A 10 Track Universal Chaser has 10 receptacles.
Each receptacle represents one track.

All chaser controllers have a speed control dial.

10 Track Model set in 7 Track Chase Mode

Chase Mode turns on the receptacles in order.

10 Track Model set in 8 Track Chase Mode

10 Track Model set in 9 Track Chase Mode

10 Track Model Set in 10 Track Chase Mode

10 Track Model with a Delay Feature

The Delay Feature holds a receptacle on for an adjustable period.
The Example above shows a three step delay.
The seventh receptacle is held on for three extra steps.

10 Track Model with a Blank Feature

The Blank Feature turns off all the receptacles for an adjustable period.
The example above shows a three step blank