Tried to board the new train but … v4150 upgrade failed for me (reported here), so I tried Velo Maker 40XX.
Activated the route out of the [Hat] embedded rack, brought up monitors on the [Hat] inbound and outbound routes, and played several short notes …
You can see the post-filter input - only CC2 input. Not sure if that is correct. No MIDI on the output side - probably not correct.
However … since I am still on v4062 and a lot has changed since then in the binding area, I suspect we may need to wait till I am able to upgrade to continue with this work
(I use a version of clamp() in expressions in my Background Rack, which is not yet implemented in v4150).