fix multiple wasapi listeners

Assets/WasapiAudio/Scripts/Unity/WasapiAudioSource.cs

@@ -17,8 +17,7 @@ namespace Assets.WasapiAudio.Scripts.Unity
         public int MaxFrequency = 20000;
         public WasapiAudioFilter[] Filters;
 
-        public void Awake()
-        {
+        public void Awake() {
             // Setup loopback audio and start listening
             _wasapiAudio = new Core.WasapiAudio(CaptureType, SpectrumSize, ScalingStrategy, MinFrequency, MaxFrequency, Filters, spectrumData =>
             {
@@ -28,18 +27,11 @@ namespace Assets.WasapiAudio.Scripts.Unity
             _wasapiAudio.StartListen();
         }
 
-        public void Update()
-        {
-
-        }
-
-        public float[] GetSpectrumData()
-        {
+        public float[] GetSpectrumData() {
             return _spectrumData;
         }
 
-        public void OnApplicationQuit()
-        {
+        void OnDestroy() {
             _wasapiAudio?.StopListen();
         }
     }