playsfx.cs

using UnityEngine;
using System.Collections;

/**
 * STEPS:
 * 1) Create an empty cube  and add it to the scene
 * 2) Add 'AudioSource' to the cube
 * 3) Add 'playsfx.cs'  to the cube
 * 4) Add your sound effect (in my case, explosion.mp3) to that script
 * 5) Add your sound effect (in my case, explosion.mp3) to your AudioSource
 * 6) Hit 'play' in Unity
 */
public class playsfx : MonoBehaviour {

    // Add a reference to our sound effect
    public AudioClip shootSound;

    // Where is this coming from? Did you add 'AudioSource' to your cube?
    // Did you drag your .mp3 to the AudioSource?
    private AudioSource source;



    // Use this for initialization
    void Awake () {
        source = GetComponent<AudioSource>();
    }


    // Update is called once per frame
    void Update () {

        // If user hits left-mouse button.....
        if (Input.GetButtonDown("Fire1"))
        {
            // Check if there is a sound effect...
            if (shootSound == null) {
                // Throw a warning. Whoops, forgot to add a sound effect!
                Debug.Log("You forgot to add a sound effect! " + shootSound);
            }

            // Play sfx
            source.PlayOneShot(shootSound);
        }

    }
}