別シーンにあるAudioSourceを呼び出す

AudioManager.cs

using System.Collections;
using System.Collections.Generic;
using UnityEngine;

[CreateAssetMenu]
public class AudioManager : ScriptableObject 
{
	public void PlayOneShot(AudioClip clip)
	{
		if (audioSource != null) {
			audioSource.PlayOneShot (clip);
		}
	}

	public AudioSource audioSource{get; set;}
}

MonoBehaviourEventTrigger.cs

using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using UnityEngine.Events;

public class MonoBehaviourEventTrigger : MonoBehaviour 
{
	public UnityEvent onAwake = new UnityEvent ();
	public UnityEvent onDestroy = new UnityEvent ();

	void Awake()
	{
		onAwake.Invoke ();
	}

	void OnDestroy()
	{
		onDestroy.Invoke ();
	}
}