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    $("body").on("contextmenu", function(e) {
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    });
  });

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 <?xml version="1.0" encoding="UTF-8"?>
<svg width="100%" height="100%" viewBox="0 0 12500 6000" version="1.1" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink">
    <title>08 Chord buttons I</title>
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            <rect id="JIminB" stroke="#577590" fill="#577590" x="6462.5" y="1962.5" width="1075" height="1075"></rect>
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        <g id="Text" transform="translate(1000.000000, 700.000000)" fill="#FFFFFF" font-family="AvenirNext-Regular, Avenir Next" font-size="450" font-weight="normal">
            <text id="Ratios-Maj">
                <tspan x="1359.575" y="1950">Ratios: 1/1 - 5/4 - 3/2</tspan>
            </text>
            <text id="Ratios-Min">
                <tspan x="1359.575" y="3950">Ratios: 1/1 - 6/5 - 3/2</tspan>
            </text>
            <text id="Minor-triad">
                <tspan x="7866.9" y="3950">Minor triad</tspan>
            </text>
            <text id="Major-triad">
                <tspan x="7877.25" y="1950">Major triad</tspan>
            </text>
            <text id="Play-notes">
                <tspan x="0" y="450">Play notes</tspan>
            </text>
            <text id="Play-chord">
                <tspan x="6500" y="450">Play chord</tspan>
            </text>
        </g>
    </g>
</svg>

body {
  background-color: #000000;
  font-family: Avenir next;
  font-size: 100%;
  user-select: none;
  touch-action: none;
}

svg{
  display:block;
  position: absolute;
  z-index:0;
  height: 100%;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  touch-action: none;
  background-color: #000000;
}


/* Portrait orientation */
/*
@media screen and (orientation: portrait) {
button{
  display: block;
  position: absolute;
  background-color:#000000;
  font-family: avenir next;
  border-radius: 2px;
  border-width: 2px;
  border-style: solid;
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  height: 7%;
  width: 17%;
  right: 2%;
  z-index: 3;
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}
}
*/
/* Landscape orientation */
/*@media screen and (orientation: landscape) {*/
button{
  display: block;
  position: absolute;
  background-color:#000000;
  font-family: avenir next;
  border-radius: 4px;
  border-width: 2px;
  border-style: solid;
  user-select: none;
  height: 10%;
  width: 15%;
  right: 2%;
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}
/*}*/

.ActiveButton {
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  border-color: #577590;
}

.OtherButton {
  color: #577590;
  background-color: #000000;
  border-color: #577590;
}

#PureButton {
  top: 35%;
  left: 10%
}

#ReducedButton{
  top: 55%;
  left: 10%
}

#SelectorText{
  display: none;
  position: absolute;
  left: 5%;
  top: 8%;
  color: #ffffff;
  z-index: 5
}

// General

console.clear(); 

var elem = document.documentElement;


const baseFreq = 261.63
var root = baseFreq
var transpose=0
var voice = 0
var maxVoices = 4
var KeyArray = []
let index

//*** initialize tone.js synth ***

     // core synthesizer
const voice1 = new Tone.Synth({oscillator: {type:"triangle"},
  envelope: { attack : 0.05, decay : 3.50, sustain : 1, release : 7.5}, 
  volume: -12});

const voice2 = new Tone.Synth({oscillator: {type:"triangle"},
  envelope: { attack : 0.05, decay : 3.50, sustain : 1, release : 7.5}, 
  volume: -12});

const voice3 = new Tone.Synth({oscillator: {type:"triangle"},
  envelope: { attack : 0.05, decay : 3.50, sustain : 1, release : 7.5}, 
  volume: -12});

const voice4 = new Tone.Synth({oscillator: {type:"triangle"},
  envelope: { attack : 0.05, decay : 3.50, sustain : 1, release : 7.5}, 
  volume: -12});


const reverb = new Tone.Reverb({wet:0.5}).toDestination();

Tone.connect(voice1, reverb);
Tone.connect(voice2, reverb);
Tone.connect(voice3, reverb);
Tone.connect(voice4, reverb);


      
// Interaction mode

let isTouchDevice
var interaction = 'click'

if ((navigator.maxTouchPoints > 0) || (navigator.msMaxTouchPoints > 0)){isTouchDevice = true}
else {isTouchDevice = false}
    
if (isTouchDevice) {interaction = 'touchstart'}



// Make array of key elements by id

for(var i=0, n=document.getElementsByClassName("key"); i<n.length; i++) {
   KeyArray.push(n[i].id);
   };



// Trigger notes

//Tone.Transport.start()

function triggerNoteOnOff() {
  
  var index = math.eval(this.id)
 
synth[voice].triggerAttackRelease(root*index, "32n");
  
if (voice >= (maxVoices-1)){voice = 0}
else {voice ++}
 
  this.style.fillOpacity=0.75

  const key = this.id;

 function resetOpacity(key){
document.getElementById(key).style.fillOpacity=0}

  setTimeout(function(){resetOpacity(key)}, 200)
  
}
  
  for (const KeyValue of KeyArray) {
    document.getElementById(KeyValue).addEventListener(interaction, triggerNoteOnOff)
  }



document.getElementById("JImaj").addEventListener('click', function(){
        voice1.triggerAttackRelease(root, "2n"); 
        voice2.triggerAttackRelease(root*eval(5/4), "2n"); 
        voice3.triggerAttackRelease(root*eval(3/2), "2n"); 
    this.style.fillOpacity=0.5
  const key = this.id;
  function resetOpacity(key){
    document.getElementById(key).style.fillOpacity=0}
  setTimeout(function(){resetOpacity(key)}, 200)
})

document.getElementById("JImajArp").addEventListener('click', function(){
        now = Tone.now()    
        voice1.triggerAttackRelease(root, "16n", now); 
        voice2.triggerAttackRelease(root*eval(5/4), "16n", now+0.5); 
        voice3.triggerAttackRelease(root*eval(3/2), "16n", now+1); 
    this.style.fillOpacity=0.5
  const key = this.id;
  function resetOpacity(key){
    document.getElementById(key).style.fillOpacity=0}
  setTimeout(function(){resetOpacity(key)}, 200)
})

document.getElementById("JImin").addEventListener('click', function(){
        voice1.triggerAttackRelease(root, "2n"); 
        voice2.triggerAttackRelease(root*eval(6/5), "2n"); 
        voice3.triggerAttackRelease(root*eval(3/2), "2n"); 
    this.style.fillOpacity=0.5
  const key = this.id;
  function resetOpacity(key){
    document.getElementById(key).style.fillOpacity=0}
  setTimeout(function(){resetOpacity(key)}, 200)
})

document.getElementById("JIminArp").addEventListener('click', function(){
        now = Tone.now()      
        voice1.triggerAttackRelease(root, "16n", now); 
        voice2.triggerAttackRelease(root*eval(6/5), "16n", now+0.5); 
        voice3.triggerAttackRelease(root*eval(3/2), "16n", now+1); 
    this.style.fillOpacity=0.5
  const key = this.id;
  function resetOpacity(key){
    document.getElementById(key).style.fillOpacity=0}
  setTimeout(function(){resetOpacity(key)}, 200)
  
})