The timeline is the region at the bottom of the screen and is used to edit and view choreography at any time of the show.
Play button: Start the show playing in the skyfield. Once the show is playing the play button turns into a pause button to stop the show
Waveform: Shows the music, making it easy to synchronize fireworks to peaks in the music.
Firework: Each firework in the show appears in the timeline as line drawn from the launch time until the firework is no longer visible, with an dot at the burst time. Clicking in the timeline selects the firework under the click, and draging along the timeline selects all fireworks in a region of time.
Playhead: Shows the point in time currently displayed in the skyfield view. The playhead can be dragged back and forth to change the part of the show displayed
Cake launches: Fireworks that are cakes have extra tick marks drawn at each show after the first.
Zoom bar: Controls the scale and position of the timeline. Dragging the yellow square at each end of the timline expands or contracts the region of the show displayed in the timline, zooming the scale out and in. Dragging the center of the zoom bar moves the timeline back and forth across the full duration of the show.