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   Ratios: 
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    <title>05 Otones and Utones stepwise</title>
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// General

console.clear(); 

var elem = document.documentElement;


const baseFreq = 220
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 : 0, release : 3.5}, 
  volume: -6});

const voice2 = new Tone.Synth({oscillator: {type:"triangle"},
  envelope: { attack : 0.05, decay : 3.50, sustain : 0, release : 3.5}, 
  volume: -6});

const voice3 = new Tone.Synth({oscillator: {type:"triangle"},
  envelope: { attack : 0.05, decay : 3.50, sustain : 0, release : 3.5}, 
  volume: -6});

const voice4 = new Tone.Synth({oscillator: {type:"triangle"},
  envelope: { attack : 0.05, decay : 3.50, sustain : 0, release : 3.5}, 
  volume: -6});

const synth = [voice1, voice2, voice3, voice4]



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++) {
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   };



// 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=0.5

  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)
  }



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})

document.getElementById("ReducedButton").addEventListener('click', function() {
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  document.getElementById("ReducedButton").className = "ActiveButton";
  document.getElementById("PureButton").className = "OtherButton";
})