x = 0;
modulo = thisComp.layer("Null 3").effect("modulo (recomienzo)")("Slider"); // segundos en la timeline

for (x; x <= time; x += 0.5) {
	if ((x - inPoint) % modulo == 0){
		if(time >= x + 0.5){
			transform.opacity = 0;
		} else {
			transform.opacity = 100;
		}
	}
}