Sound Doesn't trigger when firing projectile

I created a laser sound I want to trigger when a projectile is fired. The projectile launches fine and there is no error when I play the scene but i still cannot hear the sound.

using System.Collections;
using UnityEngine;

public class ThrowObject : MonoBehaviour {

public GameObject projectile;
public AudioClip shootSound; 

private float throwSpeed = 2000f;
private AudioSource source;
private float volLowRange = 0.5f;
private float volHighRange = 1.0f;

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

// Update is called once per frame
void Update () {
	if (Input.GetButtonDown("Fire1"))
		source.PlayOneShot(shootSound, 1F);
		GameObject throwThis = Instantiate (projectile, transform.position, transform.rotation) as GameObject;
		throwThis.GetComponent<Rigidbody>().AddRelativeForce (new Vector3 (0, 0, throwSpeed));


For reference I am following this tutorial (Live Training 17th November 2014 - Sound Effects and Scripting - YouTube) and I am stuck at the 20:48 minute mark. Even after tweaking in the Inspector my sound still does not play.

Just Restart Unity while you Earphone Connected…
I m not sure about this…But I always face this…
I don’t think your Script has a problem…

There are a couple things to look at here,
1st. Do you have multiple audio sources?

If so, you might want to make the Audio Source public an assign it yourself.

2nd. Your source’s settings.

Post a screenshot of them so I can check it.