Delt: Imagine, that you can have X effects but use only one. What you wanna do? Route parameters of these X effects to one effect and control them via it. It is what i am looking for :-). That one effect. Or you can look at Kazakore example…
Kazakore: You are the man! your XRNS is exactly what i am looking for. I dont need anything more than hydra with visible slider of every routed parameter´s max. I cant try duplex right now but in mixer it looks like it can be controlled by it. Or maybe if ï know how you made it i can figuure out something more.
But i hope new renoise will come with even better routing. 
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Btw.
Here is another nice oldskool topic about it.
I´ve found also some another topics about similar thing. But usually people want something even more complex (saving multiple fx from multiple channels into one file etc.). So i hoped that my “request” is possible with 2.8 somehow. By metamixer that i´ve never used or some blacklisted device e.g…