"these are actually 'passing chords' not notes"
Audiotrack is right.
But it's more than that. They allow for unique musical accents. It's a hit or miss adventure, as you are working with real pre-recorded audio. Sometimes they, (M.chords)do wonders, sometimes just sound silly. All depends on style, setting parameters, tempo, specific track and a chance. Not theory compliant, sure, but can indeed make parts sound interesting. I do hope they expand on the concept.