Keyframe accumulator for After Effects

keyframeAccum.jsx

var audioSource = thisComp.layer("Audio Amplitude").effect("Both Channels")("Slider");

var step = 1; // step in frames
var accum = 0;


if(audioSource.numKeys > 0){
    var k = 0;
    if(time >= step*2){

        while(k <= time){
          if(audioSource.valueAtTime(k) > audioSource.valueAtTime(k - step*thisComp.frameDuration)){

            accum+=audioSource.valueAtTime(k)-audioSource.valueAtTime(k - step*thisComp.frameDuration)
          }

          k+=step*thisComp.frameDuration;

        };
    };
};
value = accum;