​

let ratios = [];

// Western Diatonic Major Ratios

ratios = [1, 1.125, 1.25, 1.34, 1.5, 1.67, 1.875, 2];

// Western Diatonic Minor Ratios

//ratios = [1, 1.125, 1.2, 1.34, 1.5, 1.6, 1.875, 2];

// Pentatonic Scale

//ratios = [1, 1.125, 1.25, 1.5, 1.67, 2];

// Arabic / Indian Scale

//ratios = [1, 1.067, 1.25, 1.34, 1.5, 1.6, 1.875, 2];

​

function setup() {

  createCanvas(400, 400);

  osc = new p5.Oscillator();

  osc.setType("sine");

  osc.freq(0);

  osc.start();

}

​

function draw() {}

​

// Base frequency

let BASE = 300;

​

// Time variable for noise() and sin()

let t = 0;

​

function keyPressed() {

  //// Random algorithms

  //let f = random(200, 400);

  //// Randomly choose a note from scale

  //let f = random(ratios) * BASE;

  // Move along the curve at different rates

  t+= random(1) > 0.3 ? 1 : 0.2;

  // Move along noise curve

  //let r = noise(t) * 8;

  // Move along sine wave

  let r = (sin(t) + 1) * 4;

  // Calculate the frequency

  let f = ratios[floor(r)] * BASE;

  // Change the frequency of oscillator

  osc.freq(f);

  // Display frequency

  background(220);

  textSize(32);

  textAlign(CENTER, CENTER);

  text(floor(f), width / 2, height / 2);

}

​