​

let x = []; // initialize an array with these brackets

let y = [];

​

function setup() {

  createCanvas(400, 400);

  abs = new BeatStep("Arturia BeatStep");

  for (let i = 0; i < 16; i++) {

    x[i] = random(width); // initialize with random width values

    y[i] = random(height); // initialize with random height values

  }

}

​

function draw() {

  background(0);

​

  for (let i = 0; i < 16; i++) {

    let spd = map(abs.dials[i],0,127,-4,4); // midi is 127, range will become 0 - 2;

    y[i]+=spd;

    circle(x[i], y[i], 20);

​

    if (y[i] >= width && spd > 0) {

      y[i] = 0;

    }

    if (y[i] <= width && spd < 0) {

      y[i] = width;

    }

  }

}

​