Presets set the shape and colors; size, speed, fade
and line width are kept. Next to them: undo, redo, reset to defaults and random settings.
Shortcuts: Space play/stop · F fullscreen ·
C color mode · G glow · R random · H help ·
←/→ nudge multiplier (hold Shift for bigger steps) ·
Ctrl/⌘+Z undo · add Shift to redo.
Click a value to type an exact number.