In the inspector for MIDI tracks; you can select the device to receive MIDI from, and you can select the device to transmit MIDI to.
How can I transmit to multiple devices? Is it even possible? If not… I could work around my problem if HALion Sonic SE has some sort of MIDI thru option. Does it have one?
… provided the currently-active track is a regular MIDI track and not an Instrument Track (because they don’t have MIDI Sends… requested about a million times )