By default one event will only fire a single shell. Each firework event has property called Firemode.
Once you select "Stepper" more options will appear.
Shots
Amount of shots per repeat.
Repeats
Repeat all steps again.
Shape
Defines the shot order.
Step Angle
The total angle .
Step Length
Delay between each step (sec).
Mirror
This will invert the order every repeat cycle.
Invert
Inverts the order.
