My All Code Same with Course but It's not working

Hello everyone.

I’m getting crazy about the volume thing. I wrote the code myself and it didn’t work then I follow the lecture and it’s true but not working. I can read volume by Debug.Log but cannot set it. Here are my codes for music manager and our debugging script.

public class setThingsAtStart : MonoBehaviour {

MusicManager audioSource;
float volSet;


// Use this for initialization
void Awake () 
{
	audioSource = gameObject.GetComponent<MusicManager> ();
	volSet = PlayerPrefsManager.getMasterVolume ();
	Debug.Log ("Master Volume is: " + PlayerPrefsManager.getMasterVolume ());
}
void Start()
{
	audioSource.setVolume (volSet);
	Debug.Log("Volume Set as: " +volSet);

}

}

Here is music Manager

public class MusicManager : MonoBehaviour {

public AudioClip[] levelMusicChangeArray;
[SerializeField] int levelIndex;
AudioSource audioSource;

void Awake()
{
	DontDestroyOnLoad (this);
}
void Start () 
{
	audioSource = GetComponent<AudioSource> ();
}

void OnLevelWasLoaded()
{
	levelIndex = SceneManager.GetActiveScene ().buildIndex;
	AudioClip thisLevelMusic;
	thisLevelMusic = levelMusicChangeArray [levelIndex];
	if(thisLevelMusic)
	{
		audioSource.clip = thisLevelMusic;
		audioSource.Play ();
		if (levelIndex < 0) 
		{
			audioSource.loop = true;
		}
	}
	}

public void setVolume(float volume)
{
	audioSource.volume = volume;
}

}

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