I'm on archive overload

I was under the impression the dumping of CCV into the intake manifold was regulated by a resonance valve. Apparently it's a free flow through that cobweb of small fragile hoses and connectors.

Since I have your attention, what does the valve under the crossover pipe do and what does the valve in the middle of the intake manifold do?

Thanks,
Sixto
95 S420
87 300SDL