freq = 0.5; decay = 1; n = 0; if (numKeys > 0){ n = nearestKey(time).index; if (key(n).time > time) n--; } if (n > 0){ t = time - key(n).time; amp = velocityAtTime(key(n).time - .001); w = freq*Math.PI*2; value + amp*(Math.sin(t*w)/Math.exp(decay*t)/w); }else value