How to turn off an audio source when another is being played based on proximity?

Hi guys, I'm currently stuck on making a script that allows an audio source to be turned off when another is being played.

The second audio source is played based on its proximity with the player. Here's my c# script so far.

using UnityEngine; using System.Collections;

public class PlaySounds : MonoBehaviour {

 private float maxDistance = 20.0f; 
 private Transform listenerObject; 
 private bool oldState = false; 

 public float distance; 
 public bool outOfRange; 

 void Start () { 

     AudioListener listener = FindObjectOfType (typeof(AudioListener)); 
     listenerObject = listener.transform; 

 } 

 void Update () { 
      
     distance = listenerObject.position - transform.position; 

     outOfRange = distance.sqrMagnitude > maxDistance * maxDistance; 

     if (oldState != outOfRange) {  

         if (outOfRange) { 

             GetComponent<AudioSource>().Stop (); 

         } else {
         
             GetComponent<AudioSource>().Play (); 
         
         } 

     }  

     oldState = outOfRange; 

 } 

}