Spectrum - sync colors to a beat

spectrum

using UnityEngine;
using System.Collections;
 
public class Spectrum : MonoBehaviour {
        public AudioSource song;
        public GameObject cube;
 
        float[] historyBuffer = new float[43];
 
        // Use this for initialization
        void Start () {
        }
       
        // Update is called once per frame
        void Update () {
 
                //compute instant sound energy
                float[] channelRight = song.audio.GetOutputData (1024,1);
                float[] channelLeft = song.audio.GetOutputData(1024,2);
 
                float e = sumStereo (channelLeft, channelRight);
 
                //compute local average sound evergy
                float E = sumLocalEnergy ()/historyBuffer.Length; // E being the average local sound energy
 
                //calculate variance
                float sumV = 0;
                for (int i = 0; i< 43; i++)
                        sumV += (historyBuffer[i]-E)*(historyBuffer[i]-E);
               
                float V = sumV/historyBuffer.Length;
                float constant = (float)((-0.0025714 * V) + 1.5142857);
 
                float[] shiftingHistoryBuffer = new float[historyBuffer.Length]; // make a new array and copy all the values to it
 
                for (int i = 0; i<(historyBuffer.Length-1); i++) { // now we shift the array one slot to the right
                        shiftingHistoryBuffer[i+1] = historyBuffer[i]; // and fill the empty slot with the new instant sound energy
                }
 
                shiftingHistoryBuffer [0] = e;
 
                for (int i = 0; i<historyBuffer.Length; i++) {
                        historyBuffer[i] = shiftingHistoryBuffer[i]; //then we return the values to the original array
                }
 
                if (e > (constant * E)) { // now we check if we have a beat
                        cube.GetComponent<SpriteRenderer> ().color = Color.red;
                } else {
                        cube.GetComponent<SpriteRenderer> ().color = Color.yellow;
                }
 
                Debug.Log ("Avg local: " + E);
                Debug.Log ("Instant: " + e);
                Debug.Log ("History Buffer: " + historybuffer());
                Debug.Log ("sum Variance: " + sumV);
                Debug.Log ("Variance: " + V);
                Debug.Log ("Constant: " + constant);
                Debug.Log ("--------");
        }
 
        float sumStereo(float[] channel1, float[] channel2) {
                float e = 0;
                for (int i = 0; i<channel1.Length; i++) {
                        e += ((channel1[i]*channel1[i]) + (channel2[i]*channel2[i]));
                }
 
                return e;
        }
 
        float sumLocalEnergy() {
                float E = 0;
 
                for (int i = 0; i<historyBuffer.Length; i++) {
                        E += historyBuffer[i]*historyBuffer[i];
                }
 
                return E;
        }
 
        string historybuffer() {
                string s = "";
                for (int i = 0; i<historyBuffer.Length; i++) {
                        s += (historyBuffer[i] + ",");
                }
                return s;
        }
}