Minor chords trigger sadness. Dissonance triggers fear. This engine generates only swelling Major 7th chords.
Psychoacoustics of Harmony: Major 7th chords (Root, 3rd, 5th, 7th) are culturally and biologically associated with "Resolution" and "Dreaminess." They lack the tension of the tritone. This signals the amygdala that no threats are present, allowing the parasympathetic nervous system to dominate.