Added a sound source to the test scenario.

data/scenario-test.cfg

@@ -165,6 +165,22 @@ Xu          , Xu          , Qxu         , Qxu         , Ql          , Ql
         [/time_area]
     [/event]
 
+    [event]
+        name=prestart
+        [sound_source]
+            id=birds
+            sounds=ambient/birds1.ogg,ambient/birds2.ogg,ambient/birds3.ogg
+            delay=0
+            chance=100
+            check_fogged=true
+            loop=-1
+            x=21
+            y=5
+            full_range=3
+            fade_range=5
+        [/sound_source]
+    [/event]
+
     [event]
         name=moveto
         [filter]