After Effects: Bounce Expression

gistfile1.txt

amp = .1;
freq = 2.0;
decay = 6.0; 
n = 0; 

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

if(n == 0) {
	t=0; 
} else { 
	t = time - key(n).time; 
} 

if(n > 0 && t < 1) { 
	v  = velocityAtTime(key(n).time - thisComp.frameDuration/10);
	value + v*amp*Math.sin(freq*t*2*Math.PI)/Math.exp(decay*t); 
} else {
	value;
}