To set the properties size, opacity and transfer mode over life, Trapcode Particular uses a curve-drawing interface:
To draw a curve, click and paint inside the drawing area.
Select a preset
To select a preset, click it.
Commands
Smooth - makes the curve smoother. Hold down Shift for extra strong smoothing.
Random - completely randomizes the curve.
Flip - flips the curve horizontally.
Copy - copy this curve into clipboard.
Paste - paste curve from clipboard.