Tone.js + React.js – How to start playing multiple players simultaneously on button click using the Tone.Players method instead of Tone.Player?

I’m attempting to refactor this code to make it more DRY. How can I start the playback of the tracks using the Tone.Players method? codesandbox – https://codesandbox.io/s/tone-mixer-2-lyeqqz

  let player = {};
  for (let i = 0; i < tracks.length; i++) {
    player["buffers" + playerNum] = buffers["track" + playerNum];
    playerNum++;
  }

  const players = new Tone.Players(player);

  console.log("playerName:", players.player.name); // player

  players.player("player").start(); // Uncaught Error: No Player with the name player exists on this object