--- a/AbstractOperatingSystem.st	Wed Oct 30 21:18:41 2019 +0100
+++ b/AbstractOperatingSystem.st	Fri Nov 01 13:54:19 2019 +0100
@@ -7017,9 +7017,14 @@
 
 playSound:fileName
     "play a soundfile (wav)
-     unsupported - simply stay silent"
+     unsupported in the AbstractOS; must be redefined in concrete.
+     If not, simply stay silent."
 
     ^ self.
+
+    "
+     OperatingSystem playSound:(Expecco::Expecco projectDirectory / 'resources/sounds/test_complete.wav')
+    "
 !
 
 playSound:fileName mode:modeInteger