Index: trunk/BNC/src/bncfigureppp.cpp
===================================================================
--- trunk/BNC/src/bncfigureppp.cpp	(revision 6733)
+++ trunk/BNC/src/bncfigureppp.cpp	(revision 6734)
@@ -81,5 +81,10 @@
   bncSettings settings;
 
-  _audioResponseThreshold = settings.value("PPP/audioResponse").toDouble();
+  if (settings.value("PPP/audioResponse").toString() != "" ) { 
+    _audioResponseThreshold = settings.value("PPP/audioResponse").toDouble();
+  }
+  else {
+    _audioResponseThreshold = 0.0;
+  }
 
   if (settings.value("PPP/plotCoordinates").toByteArray() != staID) {