UnityEngine.Audio.AudioMixer.SetFloat C# (CSharp) Method

        public extern bool SetFloat(string name, float value);
        private void TransitionToSnapshot(AudioMixerSnapshot snapshot, float timeToReach)

    // Use this for initialization
    void Start()
    {
        player = GameObject.FindWithTag("Player").gameObject;

        BGMBox.SetActive(false);
        mixer.SetFloat("BGM2Volume", 0);

        //UIたちの初期化
        level       = levelUI.GetComponent <Text> ();
        score       = scoreUI.GetComponent <Text> ();
        resultScore = resultScoreUI.GetComponent <Text> ();
        highScore   = highScoreUI.GetComponent <Text> ();
        resultUI.SetActive(false);

        Enums.Level = 0;
        Enums.Score = 0;

        //敵を生成
        for (int i = 0; i < enemys.Length; i++)
        {
            enemys [i] = Instantiate(enemy) as GameObject;
            enemys [i].transform.parent = transform;
            enemys [i].SetActive(false);
        }

        //HP回復玉を生成
        HPBall = Instantiate(healHP) as GameObject;
        HPBall.transform.parent = transform;
        HPBall.SetActive(false);

        StartCoroutine(isEnemy());
    }