var playing = false;

​

function setup() {

  createCanvas(500,500);

  backgroundColor = color(255,0,255);

  textAlign(CENTER);

  osc = new p5.Oscillator();

  osc.setType('sine');

  osc.freq(240);

  osc.amp(0);

  osc.start();

   osc1 = new p5.Oscillator();

  osc1.setType('sine');

  osc1.freq(180);

  osc1.amp(0);

  osc1.start();

   osc2 = new p5.Oscillator();

  osc2.setType('sine');

  osc2.freq(100);

  osc2.amp(0);

  osc2.start();

   osc3 = new p5.Oscillator();

  osc3.setType('sine');

  osc3.freq(300);

  osc3.amp(0);

  osc3.start();

}

​

function draw() {

  background(backgroundColor)

}

​

function mouseClicked() {

​

    if (!playing) {

      osc.amp(0.5, 0.05);

      playing = true;

      backgroundColor = color(0,255,255);

    }else if{

      osc1.amp(0.5, 0.05);

      playing = true;

      backgroundColor = color(0,0,255);

    }else if{

      osc2.amp(0.5, 0.05);

      playing = true;

      backgroundColor = color(0,0,0);

      }else if{

      osc3.amp(0.5, 0.05);

      playing = true;

      backgroundColor = color(0,255,0);

      }

}