As of the time of writing, Gig Performer 4 does not support sending MIDI messages from a rackspace to the Global Rackspace or vice versa, you can only send audio data. Although a future version will most likely add this support (legal caveat – no guarantees), there are ways to accomplish this using MIDI OSC blocks instead.
Click here to read the complete article: https://gigperformer.com/using-midi-osc-blocks-to-send-midi-to-the-global-rackspace/