I don’t know if it’s possible in Artist, but it’s certainly possible in Cubase.
- Create the instruments you want to use as VST Instruments in the rack (NOT instrument tracks, as they will not work).
- Create the MIDI track you want, with MIDI data on it.
- Ensure that MIDI Sends is available in your inspector (right-click on it and tick it, if not)
- Turn on Send #1, and set the output (which will start out as “not connected”) to the first VST Instrument
- Turn on Send #2, and set the output to the Second VST Instrument.
You should be good to go. You can, of course, send the “usual” output to a VST Instrument as well (or external MIDI or wherever), so you can have up to 5 instruments driven by the one track (original plus 4 sends)