BrainModular

Meanwhile the embeded function on HH4 here 2 patch to create VCA behaviour
Put a vca master patch on an empty rack to transform it on VCA (put it in your mixer)
Add a VCA slave patch at the end of each rack you want to control and configure the corresponding vca you want
Enjoy.
http://www.sensomusic.org/downloadaddon ... %20vca.zip

What is the VCA feature - is it new in HH4 ?

Did you try this addon ? It reproduce a vca behaviour . It means you can affect a fader rack to remote proportionnaly the level of other.
It runs with HH3