This script complements the audio visualizer script for initializing the parametric cubes,

AudioPeer.cs

using System.Collections;
using System.Collections.Generic;
using UnityEngine;

[RequireComponent(typeof(AudioSource))]  
public class AudioPeer : MonoBehaviour {

	AudioSource _audioSource;
	// from a sound theory spectrum standpoint all seven of those buckets are remapped to 512 values
	public static float[] _samples = new float[512];

	// Use this for initialization
	void Start () {
		_audioSource = GetComponent<AudioSource> ();	
	}
	
	// Update is called once per frame
	void Update () {
		GetSpectrumAudioSource ();
		
	}
	void GetSpectrumAudioSource() 
	{
		// get Spectrum Data takes samples, channel, and window data use Blackman to reduce data leakage
		// get spectrum data and put it into _sampless
		_audioSource.GetSpectrumData(_samples, 0, FFTWindow.Blackman);
	}
}