Could someone explain the AUX buses in Virus A, B and C?

[HUBA]

I've read the manuals but can't really get my head around how this actually works. I only have a TI so I can't try it out.

Is it possible, with internal routing, for sound shapers to interact between patches, so that you could use an envelope or LFO from one patch to modulate pulse with or oscillator pitch of another patch? I read something somewhere that indicated that this was possible, but I assumed it would have to be a source doorway in the mod matrix for this to be possible(?)

Is it possible, in virus A, B and C multi mode, to chain several patches in series so that one could say place filters AFTER an effect, and then add another effect and then yet another filter after that and so on, everything affecting the same, one and only, single patch?