HALion is an extremely powerful workstation with amazing MIDI FX and scripting features, but it is a closed box at the moment. For example, we can’t use it to control other VST instruments or external synths. For this to be possible, we should have MIDI-out port like in Arturia Pigments or UVI Falcon.
Could you please consider adding MIDI-out port in a future version? It would be great to also integrate HALion MIDI FX somehow into MIDI inserts in Cubase. But even without such integration, MIDI out port (that outputs both note and CC events) should be sufficient in most cases.