Application of finite difference/time-stepping methods for physical modeling in Reaktor?

Hey, I want to be able to apply this paper to be able to simulate a geometrical model of a spring reverb tank. It is applied using finite difference techniques, more of which can be found here.
The only issue here is that I have no idea how the hell I can properly apply this technique using the method displayed at 1:19. I have a basic experience in waveguide/karplus-strong physical modeling and have already created a spring reverb you can find here.
The reason I'm posting this is because I want to branch out and test the waters with different, more physically-accurate methods of sound generation.
Regards,
Comments
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I've done some reading about that technique and am intrigued by it. They've also done an interesting brass horn. But unfortunately, the math is beyond me.
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I really don't blame you Chet. This stuff is hard.
Maybe you could try studying this ensemble I found? It's String by Anders Straadt.
I don't think it's really 'finite difference' in the most rigid sense but it does calculate the newtonian forces of a string.
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