Index: trunk/BNC/src/bnchelp.html
===================================================================
--- trunk/BNC/src/bnchelp.html	(revision 4527)
+++ trunk/BNC/src/bnchelp.html	(revision 4552)
@@ -269,4 +269,5 @@
 &nbsp; &nbsp; &nbsp; 3.12.7.7 <a href=#pppquick>Quick-Start</a><br>
 &nbsp; &nbsp; &nbsp; 3.12.7.8 <a href=#pppgap>Maximal Solution Gap</a><br>
+&nbsp; &nbsp; &nbsp; 3.12.7.9 <a href=#pppaudio>Audio Response</a><br>
 &nbsp; &nbsp; &nbsp; 3.12.8 <a href=#pppsigmas>Sigmas</a><br>
 &nbsp; &nbsp; &nbsp; 3.12.8.1 <a href=#pppsigc>Code</a><br>
@@ -1635,4 +1636,12 @@
 </p>
 
+<p><a name="pppaudio"><h4>3.12.7.9 Audio Response - optional if Quick-Start is set</h4></p>
+<p>
+For natural hazard prediction and monitoring it may be appropriate to generate audio alerts. For that you can specify an 'Audio response' threshold in meters. A beep is produced by BNC whenever a horizontal PPP coordinate component differs by more than the threshold value from the specified marker coordinate.
+</p>
+<p>
+Default is an empty option field, meaning that you don't want BNC to produce acoustic warning signals.
+</p>
+
 <p><a name="pppsigmas"><h4>3.12.8 Sigmas</h4></p>
 <p>