Index: Sound.cs
===================================================================
--- Sound.cs	(revision 2421)
+++ Sound.cs	(working copy)
@@ -658,7 +658,7 @@
                 viewpoint = Camera.Styles.External;
             }
 
-            if (conditions.CabCam && viewpoint == Camera.Styles.Cab)
+            if (conditions.CabCam && (viewpoint == Camera.Styles.Cab || viewpoint == Camera.Styles.ThreeDimCab))
                 return true;
             if (conditions.PassengerCam && viewpoint == Camera.Styles.Passenger)
                 return true;