Hi Rich
This is normally done for choosing specific VST and DXI
By right clicking on a midi track in real band and choosing
Specific vst/dxi for MIDI track this will insert the vst on its own port.

Your external hardware mid synth will be as selected in your midi set up
As an input and output device .

Please remember I am using a midi controller keyboard just to play the midi notes to the software to VST and DXI of which I can insert separate instances of
I am not using an external synth like a full Yamaha keyboard with on board voices for any of my voices.
So I don’t have the problem that you have,
You could try using your keyboard as just an input device to send midi note data to the software and use internal vst and dxi
Other than that you have me stumped

Mike


BIAB2021 UltraPlus,AsusN55S1Tbssd, W10/64,Akai EIEpro
Yamaha CVP405,SquireStrat, CoolsoftVMidSynth
Novatation Impulse61 Ctr kbd, Cwalk blab Kontakt

http://mikesmusic.byethost16.com/