Di-Chord Sound Factor Reference — All 11 Di-Chords

Three-factor perceptual model: Pulsation · Fundamental/Octave (F/O) · Harmonicity  |  ★ = Sprint 1 Focus

Di-Chord Common Name Pulsation F/O Factor Harmonicity Perceptual Summary
Dissonant Family — maximum to strong tension
[1] Minor 2nd Dissonant Fundamental — upper note refers down toward root Non-harmonic
overtones clash		 Maximum tension — buzzes urgently
[2] Major 2nd Dissonant Fundamental — upper note refers down toward root Harmonic
overtones align		 Strong tension — pushes hard to resolve
[11] Major 7th Dissonant Octave — upper note refers up toward octave Non-harmonic
overtones clash		 Extreme tension — almost painful
[10] Minor 7th Dissonant Octave — upper note refers up toward octave Harmonic
overtones align		 Moderate tension — restless
Modal Family — gentle wave, warm or bright color
[3] Minor 3rd Sprint 1 Modal Fundamental — upper note refers down toward root Non-harmonic
overtones clash		 Gentle wave — warm minor quality
[4] Major 3rd Sprint 1 Modal Fundamental — upper note refers down toward root Harmonic
overtones align		 Gentle wave — bright major quality
[8] Minor 6th Modal Octave — upper note refers up toward octave Non-harmonic
overtones clash		 Gentle wave — dark heavy minor color
[9] Major 6th Modal Octave — upper note refers up toward octave False-harmonic
appears harmonic, slightly unstable		 Gentle wave — open lifting color
Perfect Family — nearly still to frozen stability
[5] Perfect 4th Perfect Fundamental — upper note refers down toward root Non-harmonic
overtones clash — dense color		 Nearly still — open hollow stability
[6] Tritone Perfect Both — splits octave, refers neither way Neutral
neither — frozen ambiguity		 Frozen — ambiguous, splits the octave
[7] Perfect 5th Perfect Octave — upper note refers up toward octave Harmonic
overtones align — clear color		 Nearly still — full resonant stability
Three-Factor Legend
Pulsation
The rate at which beating between overtones creates a felt sense of motion or stillness.
Dissonant — fast beating, strong tension
Modal — slow wave, gentle color
Perfect — near stillness or frozen
F/O Factor
Which pole of the octave the upper note gravitates toward — the root (Fundamental) or the octave above.
Fundamental — upper note pulls down toward root ([1]–[5])
Both — pulls equally neither way ([6])
Octave — upper note pulls up toward octave ([7]–[11])
Harmonicity
Whether the overtone series of the two notes aligns (harmonic) or clashes (non-harmonic), affecting color density.
Harmonic — overtones align, clear open color
Non-harmonic — overtones clash, dense heavy color
Neutral — frozen ambiguity ([6])
False-harmonic — appears harmonic, slight instability ([9])

AMF Sprint 1 · Di-Chord Sound Factor Reference · R4 · 2026