No progression will start with V or the diminished chord (vii°).
No chord will appear three times in a row.
Each bar has a 1 in 5 chance of containing two chords.
Progression length is determined by the Chaos slider:
0–25: only 2‑ and 4‑bar progressions.
25–75: any length (2–6 bars) possible, but 2‑ and 4‑bar progressions are more likely.
75–100: no restrictions (equal chance for 2–6 bars).
The Chaos slider also unlocks additional chord categories:
At 25: diatonic plus chords (Imaj7, ii7, iii7, IVmaj7, vi7, and sus chords) become available.
25–50: secondary dominants become available but must resolve (the next chord must start with the numeral on the right of "/" in the previous chord).
50–99: mixture chords become available and secondary dominants no longer need to resolve.
At 100 (Full Chaos Mode): all rules (except no three consecutive and duplicate-in-a-bar) are ignored; chords are selected uniformly from all categories; in Analysis mode every bar displays "Chaos"; in Chords mode, chords are displayed as mapped.
About half of progressions will start on I (or C in Chords mode).
Each progression is generated in a random key (from: C, C#, D, Eb, E, F, F#, G, Ab, A, Bb, B), unless in Full Chaos Mode (then key is "Chaos").
Use the triangles to shift the key up or down by one half‑step.