Index: OpenSceneGraph/trunk/include/osg/AudioStream
===================================================================
--- OpenSceneGraph/trunk/include/osg/AudioStream (revision 10925)
+++ OpenSceneGraph/trunk/include/osg/AudioStream (revision 10961)
@@ -39,4 +39,6 @@
     virtual void setDelay(const double delay) { _delay = delay; }
 
+    virtual void setVolume(float) {}
+    virtual float getVolume() const { return 0.0f; }
 
 private: