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HTML 

              
                <!DOCTYPE html>
<html>
  <head>
    <title>Music</title>
  </head>
  <body>
    <button id="play">Play</button>
    <p id="playing" style="display: none">Playing</p>
    <script src="https://unpkg.com/tone@14.7.77/build/Tone.js"></script>
  </body>
</html>
!

CSS
!

JS 

              
                /////////////////
// Instruments //
/////////////////

function mkDrums() {
  let reverb = new Tone.Reverb({
    decay: 1,
    wet: 0.3
  }).toDestination();

  let hiHatFilter = new Tone.Filter(15000, "bandpass").connect(reverb);

  let hiHat = new Tone.NoiseSynth({
    envelope: {
      attack: 0.001, decay: 0.1, sustain: 0, release: 0
    },
    volume: -6
  }).connect(hiHatFilter);

  class Snare {
    constructor() {
      this.noiseFilter = new Tone.Filter(5000, "bandpass").connect(reverb);
      this.noiseSynth = new Tone.NoiseSynth({
        envelope: {
          attack: 0.001, decay: 0.1, sustain: 0, release: 0
        },
        volume: -12
      }).connect(this.noiseFilter);

      this.synth = new Tone.Synth({
        envelope: {
          attack: 0.0001, decay: 0.1, sustain: 0, release: 0
        },
        oscillator: { type: "sine" },
        volume: -12
      }).connect(reverb);
    }

    triggerAttackRelease(duration, when) {
      this.noiseSynth.triggerAttackRelease(duration, when);
      this.synth.triggerAttackRelease("G3", duration, when);
    }
  }

  let snare = new Snare();

  let kick = new Tone.MembraneSynth({
    pitchDecay: 0.02,
    octaves: 6,
    volume: -9
  }).connect(reverb);

  return { hiHat, snare, kick };
}

let drums = mkDrums();

let lowBass = new Tone.FMSynth({
  oscillator: {
    type: "triangle"
  },
  envelope: {
    attack: 0.0001, decay: 0.5, sustain: 0.3, release: 0.1
  },
  volume: -3
}).toDestination();

let highBass = new Tone.FMSynth({
  oscillator: {
    type: "square"
  },
  envelope: {
    attack: 0.0001, decay: 0.1, sustain: 0.3, release: 0.1
  },
  volume: -9
}).toDestination();

let chordSynth = new Tone.PolySynth(Tone.Synth, {
  oscillator: {
    type: "triangle"
  },
  volume: -12
}).toDestination();

// Samples from freesound.org:
// https://freesound.org/people/MTG/sounds/357432/
// https://freesound.org/people/MTG/sounds/357336/
// https://freesound.org/people/MTG/sounds/357546/
let sampler = new Tone.Sampler({
  urls: {
    "C5": "trumpet-c5.mp3", 
    "D5": "trumpet-d5.mp3", 
    "F5": "trumpet-f5.mp3"  
  },
  baseUrl: "https://skilldrick-jscc.s3.us-west-2.amazonaws.com/",
  attack: 0,
  release: 1,
  volume: -24
}).toDestination();

////////////////
// Sequencing //
////////////////

// Converts a string to an array of notes or nulls.
// Dots in the string become nulls in the array and are silent.
function mkSequence(pattern) {
  return pattern.split("").map(value => {
    if (value == ".") {
      return null;
    } else {
      return value;
    }
  });
}

// Converts a string to an array of notes or nulls.
// Spaces between pipes in the string become nulls in the array and are silent.
function mkPipeSequence(pattern) {
  return pattern.split("|").map(value => {
    if (value.trim() == "") {
      return null;
    } else {
      return value;
    }
  });
}

let drumPattern = {
  kick:  "x...x...",
  snare: "..x...x.",
  hiHat: "xxxxxxxx",
};

let hiHatSequence = new Tone.Sequence(time => {
  drums.hiHat.triggerAttackRelease("16n", time);
}, mkSequence(drumPattern.hiHat), "8n");

let snareSequence = new Tone.Sequence(time => {
  drums.snare.triggerAttackRelease("16n", time);
}, mkSequence(drumPattern.snare), "8n");

let kickSequence = new Tone.Sequence(time => {
  drums.kick.triggerAttackRelease(50, "16n", time);
}, mkSequence(drumPattern.kick), "8n");

let lowBassSequence = new Tone.Sequence((time, note) => {
  lowBass.triggerAttackRelease(note, "16n", time, 0.6);
}, mkPipeSequence("G2|  |  |G2|G2|  |  |  "), "8n");

let highBassSequence = new Tone.Sequence((time, note) => {
  highBass.triggerAttackRelease(note, "16n", time, 0.3);
}, mkPipeSequence("G3|F3|E3|D3|G2|D3|G3|D3"), "8n");

let chords = {
  1: ["D4", "G4"],
  2: ["E4", "G4"],
  3: ["C4", "E4", "G4"],
  4: ["B3", "F4", "G4"],
};

function playChord(time, chordName) {
  let notes = chords[chordName];
  chordSynth.triggerAttackRelease(notes, "16n", time, 0.6);
}

let chordSequence1 = new Tone.Sequence((time, chordName) => {
  playChord(time, chordName);
}, mkSequence("1...2...3..4...31...2...3..4.343"), "8n");

let chordSequence2 = new Tone.Sequence((time, chordName) => {
  playChord(time, chordName);
}, mkSequence("3...2...4..1.213"), "8n");

let trumpetPart = new Tone.Part((time, note) => {
  sampler.triggerAttackRelease(note, "1n", time);
}, [
  ["0:0:0", "G5"],
  ["0:2:0", "C5"],
  ["1:0:0", "G5"],

  ["2:0:0", "D5"],
  ["2:2:0", "C5"],
  ["3:0:0", "B4"],

  ["4:0:0", "G5"],
  ["4:2:0", "C5"],
  ["5:0:0", "G5"],

  ["6:0:0", "D5"],
  ["6:2:0", "C5"],
  ["7:0:0", "B4"],
  ["7:2:0", "D5"],

  ["8:0:0", "C5"],
  ["8:2:0", "E5"],
  ["9:0:0", "F5"],
  ["9:2:0", "D5"],

  ["10:0:0", "C5"],
  ["10:2:0", "E5"],
  ["11:0:0", "D5"],

  ["12:0:0", "C5"],
  ["12:2:0", "E5"],
  ["13:0:0", "F5"],
  ["13:2:0", "D5"],

  ["14:0:0", "C5"],
  ["14:2:0", "E5"],
  ["15:0:0", ["B4", "G5"]]
]);

//////////
// Song //
//////////

hiHatSequence.start("0:0:0").stop("44:0:0");
snareSequence.start("0:0:0").stop("44:0:0");
kickSequence.start("0:0:0").stop("44:0:0");

lowBassSequence.start("0:0:0").stop("47:3:0");
highBassSequence.start("4:0:0").stop("47:3:0");

chordSequence1.start("8:0:0").stop("24:0:0");
chordSequence2.start("24:0:0").stop("32:0:0");
chordSequence1.start("32:0:0").stop("40:0:0");

trumpetPart.start("16:0:0");

////////////////////
// Event Handling //
////////////////////

let play = document.querySelector("#play");
let playing = document.querySelector("#playing");

play.addEventListener("click", () => {
  // Hide this button
  play.style = "display: none";
  playing.style = "";

  Tone.start();

  // Modify this to start playback at a different part of the song
  Tone.Transport.position = "0:0:0";

  Tone.Transport.start();
});
!
999px

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