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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) {
    v = velocityAtTime(key(n).time - thisComp.frameDuration / 10);
    amp = 8;
    freq = 2.0;
    decay = 3.0;
    value + (v / 100) * amp * Math.sin(freq * t * 2 * Math.PI) / Math.exp(decay * t);
} else {
    value;
}