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Two oscillators, one per axis, drawing a slow phosphor figure. Detune them and the curve tumbles.
Horizontal oscillator ratio.
Vertical oscillator ratio. Equal ratios give an ellipse; coprime ones knot.
Offsets X against Y — opens and closes the figure.
How much of the curve stays lit behind the head. Wind it up to close the figure.
How fast the head travels along the curve.
Your settings are compiled into the slot when you install, so the Puff runs exactly what you see here.