Sharing a method I am currently using to control the MOXF VSTi from Gig Performer. This complements Sending MIDI directly to the physical MOXF workstation and hopefully helps addressing some of the issues pointed out in MOXF8 Vst sync in GP.
I’ve followed How to use GP Relayer with Cubase - #3 by npudar to learn how to use and configure the GP Relayer. Please check out that thread as well.
As other GP users, I’ve also tried to use the MOXF VSTi in its standalone version as a plugin in Gig Performer, but in my setup I could not make MOXF VSTi MIDI port 1, needed for the communication with GP, accessible outside Cubase. But the GP Relayer provides an elegant route to establish this communication.
Without further ado, the steps I took are outlined in the next sessions.
Let’s configure our GP Rackspace. The one I am using looks like this:
I’ve edited the names of the widgets slightly, but they are regular inputs/outputs and GP Relayer.
My MIDI In is configured like in the figure below. I chose to reroute all MIDI channels to channel #1 because I’m using the MOXF VSTi VOICEs but you can be creative here. See Sending MIDI directly to the physical MOXF workstation for a short discussion on how MIDI works in each MOXF playing mode.
The GP Relayer config is pretty much what is described in How to use GP Relayer with Cubase - #3 by npudar :
This was tested in Cubase AI 11. Probably works in newer versions as well but don’t me mad at me if it doesn’t 
My configs for the Cubase tracks created in step 1 look like this (again, with same renaming, but you get the gist):
Notice the IN/OUT configs here:
My MOXF VSTi setup in Cubase is as shown below:
And that’s (hopefully) all you need 
Last but not least please find below a sample gig file as well as an example Cubase project implementing all I discussed here and in Sending MIDI directly to the physical MOXF workstation
Gig file
MOXF VST Emulation via Mixing MIDI.gig (40.5 KB)
Cubase Test Project
gig_performer_moxf_relay_default.cpr.zip (168.3 KB)
I hope it helps!
