var On = effect("Blink")("Checkbox");
var L = text.sourceText.length;
var PT = time - thisLayer.inPoint;
var spd = effect("Anim")("Slider").speed;
var F = Math.round(PT % 1);
var s = thisLayer("Effects")("Anim")("Slider");
var c = "|";

var val = linear (s, 0, 100, 0, L);

if (spd != 0 & On ==1) {c == "|"} else {
    if (F ==0 & On ==1) {c == "|"
    } else {c ="";}
}

substr(0,val) + c