[Wen When]

Maybe this will help you.Add position to your text,disable range selector and add expression selector.Apply the expression below to “amout” propety.and change the value inside as needed.

delay = .1;
myDelay = delay*textIndex;
t = (time - inPoint) - myDelay;
if (t>=0){
freq =3;
amplitude = 150;
decay = 8.0;
s = amplitude*Math.cos(freq*t*2*Math.PI)/Math.exp(decay*t);
{s,s}
}else{
value
}