+ virtual double GetVolume()
+ { return 0.0; }
+ virtual bool SetVolume(double WXUNUSED(dVolume))
+ { return false; }
+
+ virtual void RESERVED3() {}
+ virtual void RESERVED4() {}
+ virtual void RESERVED5() {}
+ virtual void RESERVED6() {}
+ virtual void RESERVED7() {}
+ virtual void RESERVED8() {}
+ virtual void RESERVED9() {}
+