Midi Streaming and TC Helicon Voice Live 2

I am a keyboard player, and use a TC Helicon Voice Live 2 for background harmonies.
Currently, I have two keyboard midi out ports connected to a midi merger, and the midi out of the merger connected to the midi in of the Voice Live 2. The midi note data is used in the Voice Live 2 to match harmony voices with the notes played on the keyboards.

How can I make this work while using Gig Performer to control the program changes in the keyboards, and vocal effects processor?

Which keyboard model are you using and which MIDI interface do you use with Gig Performer ?