Factory Alarm Sound Request

So I spend the major part of the last Sunday trying to re-create a Factory Alarm sound sample as a patch for the Virus TI.

Looking at the waveform of the sound, I thought that FM should work to get there. And I managed to get close but still it's missing vital characteristics like the proper harmonic structure and the distinct metallic clang.

The original samples and my attempts can be found in the attached zip. Any help or hints is greatly appreciated.

9 Downloads of the example patches and no comments so far...

Too hard? Too easy?

Yes, thanks. I actually tried more of the various FM options. And I can get some of the character, but what is missing are the strongly detuned harmonics and the chaotic behavior. The spectrum is very distinct for those siren/alarm style sounds. I think a comb filter (in the OSC filter section) would help a lot.