WT+Synth+sample -> Env -> common Filter. Possible?

Here is a flow example using phase plant that I am trying to replicate in Halion. Is this possible? Can multiple zones/layers be fed into a common filter and then that filter and amp envelope being controlled by the same envelope? Not an envelope feeding each zones own filter, but feeding a common filter BEFORE the program audio bus and not using a auto filter since the cutoff can’t be modulated by a mono envelope or even a shaper.