FMOD.Sound.release C# (CSharp) Method

        public RESULT release                 ()
        {
            RESULT result = FMOD_Sound_Release(rawPtr);
            if (result == RESULT.OK)
            {
                rawPtr = IntPtr.Zero;
            }
            return result;
        }
        public RESULT getSystemObject         (out System system)

 void OnApplicationQuit()
 {
     PlayingMusic.release();
     channel.stop();
     system.close();
     system.release();
     channel      = null;
     PlayingMusic = null;
     system       = null;
 }