C-Sharp BASS WASAPI GetLevel gibt immer 0

namespace BeatDetect {
    public partial class Form1 : Form {
        public Form1() {
            InitializeComponent();
        }

        public Szab.BeatDetector.SpectrumBeatDetector.BeatDetectedHandler BDH = new Szab.BeatDetector.SpectrumBeatDetector.BeatDetectedHandler(TE);
        public Szab.BeatDetector.SpectrumBeatDetector x = new Szab.BeatDetector.SpectrumBeatDetector (0);

     private void button2_Click(object sender, EventArgs e){
            x.Subscribe(BDH);
            x.StartAnalysis();
            x.SetBassSensivity(Szab.BeatDetector.SensivityLevel.VERY_LOW);
        }

      public static void TE(byte a) {
            MessageBox.Show("");  
        }

   
    }
}