How to do it...

To schedule a sound to play after a given delay, do the following:

1. Create a new 3D project and import the provided sound clip files.
2. In the Inspector, set the Background of the Main Camera to black.
3. Set the Main Camera Transform Position to (224, 50, -200).
4. Set the Main Camera Camera component to have these settings: Projection = Perspective, Field of View 60, and Clipping Planes 0.3 - 300.
5. Add DirectionalLight to the scene.
6. Add a new empty GameObject named visualizer to the scene. Add an AudioSource component to this GameObject, and set its AudioClip to one of the 140 bmp loops provided.
7. Create a C# script class, SpectrumCubes, in a new folder, _Scripts, containing the following code, and add an instance as a scripted component to the visualizer GameObject:

using UnityEngine; 
 
public class SpectrumCubes : MonoBehaviour  
{ 
    const int NUM_SAMPLES = 512; 
    public Color displayColor; 
    public float multiplier = 5000; 
    public float startY; 
    public float maxHeight = 50; 
    private AudioSource audioSource; 
    private float[] spectrum = new float[NUM_SAMPLES]; 
    private GameObject[] cubes = new GameObject[NUM_SAMPLES]; 
 
    void Awake() { 
        audioSource = GetComponent<AudioSource>(); 
        CreateCubes(); 
    } 
 
    void Update() { 
        audioSource.GetSpectrumData(spectrum, 0, FFTWindow.BlackmanHarris); 
        UpdateCubeHeights(); 
    } 
 
    private void UpdateCubeHeights() { 
        for (int i = 0; i < NUM_SAMPLES; i++) 
        { 
            Vector3 oldScale = cubes[i].transform.localScale; 
            Vector3 scaler = new Vector3(oldScale.x, HeightFromSample(spectrum[i]), oldScale.z); 
            cubes[i].transform.localScale = scaler; 
            Vector3 oldPosition = cubes[i].transform.position; 
            float newY = startY + cubes[i].transform.localScale.y / 2; 
            Vector3 newPosition = new Vector3(oldPosition.x, newY, oldPosition.z); 
            cubes[i].transform.position = newPosition; 
        } 
    } 
 
    private float HeightFromSample(float sample) { 
        float height = 2 + (sample * multiplier); 
        return Mathf.Clamp(height, 0, maxHeight); 
    } 
 
    private void CreateCubes() { 
        for (int i = 0; i < NUM_SAMPLES; i++) { 
            GameObject cube = GameObject.CreatePrimitive(PrimitiveType.Cube); 
            cube.transform.parent = transform; 
            cube.name = "SampleCube" + i; 
 
            Renderer cubeRenderer = cube.GetComponent<Renderer>(); 
            cubeRenderer.material = new Material(Shader.Find("Specular")); 
            cubeRenderer.sharedMaterial.color = displayColor; 
 
            float x = 0.9f * i; 
            float y = startY; 
            float z = 0; 
            cube.transform.position = new Vector3(x, y, z); 
 
            cubes[i] = cube; 
        } 
    } 
 
} 

8. With the visualizer GameObject selected in the Hierarchy, click to choose a visualization color from the Inspector Display Color public variable for the SpectrumCubes (Script) component.
9. Run the scene – you should see the cubes jump up and down, presenting a Run-Time visualization of the sound data spectrum for the playing sound.