Untitled

  public void Update()
    {
        PlayerPrefs.SetInt("MusicOff", MusicOff ? 1 : 0);

        if (MusicOff = PlayerPrefs.GetInt("MusicOff") != 1)
        {
            AudioSource[] audios = FindObjectsOfType<AudioSource>();
            foreach (AudioSource a in audios)
            {
                a.volume = 0;
            }
        }

        if (MusicOff = PlayerPrefs.GetInt("MusicOff") != 0)
        {
            AudioSource[] audios = FindObjectsOfType<AudioSource>();
            foreach (AudioSource a in audios)
            {
                a.volume = 1;
            }
        }

        if (MusicOff)
        {
            MusicOff = PlayerPrefs.GetInt("MusicOff") == 1;
           ...