Add Piano or Drum tracks on the left; click a track to edit it, and all tracks play together on the loop. Piano tracks open a piano roll — click‑drag to draw notes (width = length), drag to move, drag the right edge to resize, right‑click to delete. Or arm Rec and play notes on your computer keyboard to record them in time. Drum tracks open a step sequencer — click cells to place hits, or hit Generate for an instant groove you can re‑roll.
By default every note is available (Chromatic). Pick a Scale to highlight the notes that belong to your key; turn Restrict on to snap everything you play or draw into that scale, so it always sounds right. Each piano has several voices and each drum track has multiple kits — pick per track.