BPM: sets tempo (30–300). Use the slider for quick changes.
Beats per bar: sets how many beats are in each bar. Beat 1 is accented.
Subdivisions: clicks between beats (eighths, triplets, sixteenths).
Swing: delays the off-beat for a swung feel (0% = straight).
Polyrhythm: overlays an A-against-B pattern when enabled.