tweak some presets and fix the long running overflow error with spectre... maybe

Assets/Util/AudioSource.cs

@@ -50,14 +50,31 @@ public class AudioSource : MonoBehaviour {
     }
 
     public void ToggleCaptureType() {
-        bool isLoopback = CaptureType == WasapiCaptureType.Loopback;
-        if (isLoopback) {
-            CaptureType = WasapiCaptureType.Microphone;
-            preferences.SetUseLoopback(false);
+        if (CaptureType == WasapiCaptureType.Loopback) {
+            UseMicrophone();
         } else {
-            CaptureType = WasapiCaptureType.Loopback;
-            preferences.SetUseLoopback(true);
+            UseLoopback();
         }
+
+    }
+
+    void UseMicrophone() {
+        CaptureType = WasapiCaptureType.Microphone;
+        preferences.SetUseLoopback(false);
+        try {
+            Initialise();
+        } catch {
+            Debug.Log("Microphone unavailable");
+            // prevents the StopListen check from
+            // running on a half initialised object
+            _wasapiAudio = null;
+            UseLoopback();
+        }
+    }
+
+    void UseLoopback() {
+        CaptureType = WasapiCaptureType.Loopback;
+        preferences.SetUseLoopback(true);
         Initialise();
     }