// Uncomment below to play each example

​

let synth = new Tone.Synth().toMaster();

let scale = [];

​

function setup() {

  createCanvas(620, 200);

}

​

​

function keyPressed(){

  let pos = parseInt(key) % 9 - 1;

  // 1 Derive pentatonic scale

  let f = 200;

  scale = [f];

  scale[3] = f * 3 / 2;

  scale[5] = f * 2;

  scale[2] = scale[5] * 2 / 3;

  scale[1] = scale[3] * 3 / 4;

  scale[4] = scale[1] * 3 / 2;

  console.log("pentatonic scale: ", scale);

  synth.triggerAttackRelease(scale[pos], 0.1);

​

  //2. Derive equal-tempered chromatic scale

  // let f = 100;

  // let scale = [f];

  // let twelfthRootOfTwo = pow(2, 1/12);

  // for (let i = 0; i < 12; i++) {

  //   scale[i + 1] = scale[i] * twelfthRootOfTwo;

  // }

  // synth.triggerAttackRelease(scale[pos], 0.1);

  // And these are the notes that get their western names from A through G.  

​

  //3. play a random equal-tempered pitch between C3 and C5  (three octaves)  

  //these are all within the C major scale, or the A minor scale

  //pitches range from C0 to B8 (C0, D0, E0, F0, G0, A0, B0; C1, D1, and so on). 

  // scale = ["C3", "D3", "E3", "F3", "G3", "A3", "B3", 

  //             "C4", "D4", "E4", "F4", "G4", "A4", "B4", 

  //             "C5", "D5", "E5", "F5", "G5", "A5", "B5" ];

  // let pos = int(random(0, scale.length));

  // let pitch = scale[pos];

  // synth.triggerAttackRelease(pitch, 0.1); 

  // Greek modes can be approximated in the equal-tempered system.

  // It is often convenient to represent notes by their MIDI number (MIDI is based on the equal-tempered tuning system). See next example for using MIDI arithmetics to deal with different scales and (approximated) modes.

}