freq = 1;
decay = 6;
duration = 0.25;
retard = textIndex*thisComp.frameDuration*2;
t = time - (inPoint + retard);
startVal = [100,100,100]; endval= [0,0,0];
if (t < duration){
linear(t,0,duration,startval,endval);
}else{
amp = (endval - startVal)/duration;
w = freq*Math. PI*2;
endval + amp*(Math, sin((t-duration)*w/Math.exp(decay*(t-duration))/w); }