Complimentary Overshoot Expression:

Simply Copy and paste on a property that has 2 or more keyframes.

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freq = 1.5;
amplitude = 0.1;
decay = 4.5;

n = 0;
if (numKeys > 0){
 n = nearestKey(time).index;
 if (key(n).time > time){
   n--;
 }
}

if (n > 0){
 t = time - key(n).time;
 v = velocityAtTime(key(n).time - .001);
 value + v * amplitude * Math.sin(freq * t * 2 * Math.PI) / Math.exp(decay * t);
}else{
 value
}

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