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                <button id="button-play">play</button>
<button id="button-stop">stop</button>




                var buttonPlay = document.querySelector('#button-play');
var buttonStop = document.querySelector('#button-stop');

// bap 
var bap =  window.bap;

// kit = instrument (kit de batterie ou autres)
var kit = bap.kit();

// pour la démo, on ne va pas utiliser de sample, juste une onde
var oscillator = bap.oscillator({
  frequency: 2200

// on ajoute notre son dans le kit

// on créé notre boucle (pattern en musique) avec ici un tempo à 108 BPM
var pattern = bap.pattern({tempo: 108});

// étape finale, le pattern est dirigé vers un canal (channel(1)) 
// et on lui ajoute des notes
// l'unité de temps est divisé en mesure.temps.temps/96 (comme sur le MPC)
  ['1.1.01', '1Q',24], // '1.1.01' => mesure 1 /  1er temps / début du temps   
  ['1.1.73', '1Q',24], // '1.1.73' => mesure 1 /  1er temps / 3:4 du temps  
  ['1.2.49', '1Q',24], // '1Q' = slot Q (je ne sais pas pourquoi il faut mettre un 1 devant)
  ['1.3.49', '1Q',24], // 24 = durée d'un quart de temps
  ['1.4.01', '1Q',24]

// JS du click
  // on lie et lit
  pattern.kit(1, kit).start();  

  //  stop