Timing
This affects chord-change timing (and the “feel”).
World + waves
Changing World/Waves applies on next Start (or Stop→Start). You can keep it “Auto” and just use Comfort/Safe mode.
Harmony + flute
Allowed chords (optional)
Leave all unchecked to keep chords on Auto. If you check any, the engine will only choose from those chord types.
Flute stays in-key (chord tones).