The documentation says that the instrument does NOT generate sound, only notes. And should be connected to a midi track with other synth or sampler. (That should be true, because i don´t get any sound out of it)
You need another host like EnergyXT to get this functionality the way you need it.
If the plugin needs to send notes through MIDI, you need something like MIDIYoke to transfer the notedata back to Renoise.
Take a MIDI keyboard and then pick three or four fingers and make any combination using the black keys as your base, i’ll promise, you’ll make nice chords in no time.
When you got a schema you like, you can always look up on the internet what you exactly are playing.