multiple audio sources playing

I'm guessing you have something on your objects with the audio sources that reads

 if (TriggerClass.instance.collidingWithPlayer == true)
         audioSource.Play();

You could instead put a trigger on each object (Just put a sphere collider and set IsTrigger to true) then in a class ON THAT OBJECT write:

 private void OnTriggerEnter(Collider other)
         {
             if (other.gameObject.CompareTag("Player"))
                 audioSource.Play();
         }
 

So the radius of your collider/trigger is the distance that determines if the player is in range and makes sure that only that object's AudioSource component plays and not all of them.