I'm guessing you're trying to save time with setting the sequence step notes by entering them via MIDI? Heheh
The Origin sequencer is really a recreation of the old-school analog pre-MIDI sequencers, with some added bells and whistles. You can experience the fun people had in the 1970s, dialing in each note individually with the knobs. If you want triads you can do that, but you still have to dial in each note with the knob
Also the sequence steps can be used as any kind of CV source, not just notes (for example filter cutoff, filter resonance, output left/right pan, envelope times, etc.)