에프터이펙트 바운싱 텍스트 expression

delay = .1;
myDelay = delay*textIndex;
t = (time - inPoint) - myDelay;
if (t >= 0){
  freq =2;
  amplitude = 100;
  decay = 8.0;
  s = amplitude*Math.cos(freq*t*2*Math.PI)/Math.exp(decay*t);
  [s,s]
}else{
  value
}