message: minor typo: columne => column
diff: keys.get(noteNames[i]).start(time, 0, "32n", 0, vel);
  }
  });
  - //set the columne on the correct draw frame
  + //set the column on the correct draw frame
  Tone.Draw.schedule(function(){
  document.querySelector("tone-step-sequencer").setAttribute("highlight", col);
  }, time);
  