public class SoundButton : MonoBehaviour {

    public AudioListener audListener;
    public Sprite soundOn, soundOff;

    private Image thisImage;

    private void Awake()
    {
        thisImage = GetComponent<Image>();

        if (PlayerPrefs.HasKey("Sound"))
        {
            if (PlayerPrefs.GetInt("Sound") == 0) // 0 - звук выключен
                ControlSound(false, soundOff);  
            else
                ControlSound(true, soundOn);    
        }
        else
        {
            ControlSound(true, soundOn);
            SaveStateSound(1); // 1 - звук включен
        }
    }

    public void SwitchSound()
    {
        if (PlayerPrefs.HasKey("Sound"))
        {
            if (PlayerPrefs.GetInt("Sound") == 0)
            {
                ControlSound(true, soundOn);
                SaveStateSound(1);
            }
            else
            {
                ControlSound(false, soundOff);
                SaveStateSound(0);
            }
        }
    }

    private void ControlSound(bool state, Sprite nowImage)
    {
        audListener.enabled = state;
        thisImage.sprite = nowImage;
    }

    private void SaveStateSound(int state)
    {
        PlayerPrefs.SetInt("Sound", state);
        PlayerPrefs.Save();
    }
}

public class Test : MonoBehaviour {

    private Animator anim;
    private AnimatorStateInfo curentState;

    private void Start()
    {
        anim = GetComponent<Animator>();
    }

    private void FixedUpdate()
    {
        curentState = anim.GetCurrentAnimatorStateInfo(0);

        if (curentState.IsName("test"))
        {
            print("Playing");
        }
    }
}