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HTML

              
                <head>
<link href="https://fonts.googleapis.com/css?family=Inconsolata" rel="stylesheet">

</head>
<div id="root"></div>

              
            
!

CSS

              
                body{
  margin:0;
  overflow:hidden;
  position:absolute;
  width:100%;
  height:100%;
  display:flex;
  justify-content:center;
  align-items:center;
  background-color: #FF51A6;
  font-family:'Inconsolata', monospace;
}

#root{
  max-height:95%;
  min-height:60%;
  width:700px;
  display:flex;
  flex-wrap:wrap;
  position:relative;
  
}

#drum-machine {
  border-style:solid;
  width:100%;
  background:#FF5351;
}

#display{
  padding:5px;
  display:flex;
  background:ORANGE;
  align-self:center;
  justify-content:center;
  font-size:20px;
}
/*div where bank button lies*/
#bankContainer{
  justify-content:center;
  display:flex;
}
/*Bank Button*/
#bank{
  font-size:15px;
  background-color: #F0D264;
  margin-top:5px;
  cursor:pointer;
  border-radius: 6px;
}
  button:focus {outline:0;}

#pads{
  display:flex;
  flex-wrap:wrap;
  justify-content:center;
}
.drum-pad{
  box-sizing:border-box;
  margin:20px;
  background:#51FF53;
  text-align:center;
  position:relative;
  width:150px;
  height:3em;
  cursor:pointer;
  box-shadow: 0 0 5px -1px rgba(0,0,0.2);
  border-radius: 6px;
}

.drum-pad:active {
  background:#A6FF51;
  box-shadow: 0 0 5px -1px rgba(0,0,0,0.6);
}

#power{
  border-radius:50%;
  height:50px;
  width:50px;
}
#bottomControl{
  display:flex;
  justify-content:space-around;
}

#vol{
  margin-top:17px;
}

/*below is to toggle input button*/
#power{
  background-color:white;
  border-style:white;
}

.footerControl{
  text-align:center;
  width:120px;
  display:inline-block;
  padding-bottom:10px;
}
.caption{
  display:block;
}
              
            
!

JS

              
                const bankOne = [
  {
    name:"kick_n_Hat",
    key:"Q",
    sound:"https://s3.amazonaws.com/freecodecamp/drums/Kick_n_Hat.mp3"
  },
  {
    name:"Heater-1",
    key:"W",
    sound:"https://s3.amazonaws.com/freecodecamp/drums/Heater-1.mp3"
 },
  {
    name:"Heater-2",
    key:"E",
    sound:"https://s3.amazonaws.com/freecodecamp/drums/Heater-2.mp3"
  },
  {
    name:"Heater-3",
    key:"A",
    sound:"https://s3.amazonaws.com/freecodecamp/drums/Heater-3.mp3"
  },
  {
    name:"Heater-4_1",
    key:"S",
    sound:"https://s3.amazonaws.com/freecodecamp/drums/Heater-4_1.mp3"
  },
  {
    name:"Heater-6",
    key:"D",
    sound:"https://s3.amazonaws.com/freecodecamp/drums/Heater-6.mp3"
  },
  {
    name:"Dsc_Oh",
    key:"Z",
    sound:"https://s3.amazonaws.com/freecodecamp/drums/Dsc_Oh.mp3"
  },
  {
    name:"Cev_H2",
    key:"X",
    sound:"https://s3.amazonaws.com/freecodecamp/drums/Cev_H2.mp3"
  },
  {
    name:"RP4_KICK_1",
    key:"C",
    sound:"https://s3.amazonaws.com/freecodecamp/drums/RP4_KICK_1.mp3"
  }
];

const bankTwo = [
  {
    name:"Chord_3",
    sound:"https://s3.amazonaws.com/freecodecamp/drums/Chord_3.mp3"  
  },
  {
    name:"Chord_1",
    sound:"https://s3.amazonaws.com/freecodecamp/drums/Chord_1.mp3",
  },
  {
    name:"Chord_2",
    sound:"https://s3.amazonaws.com/freecodecamp/drums/Chord_2.mp3"
  },
  {
    name:"Give_us_a_light",
    sound:"https://s3.amazonaws.com/freecodecamp/drums/Give_us_a_light.mp3"
  },
  {
    name:"Dry_Ohh",
    sound:"https://s3.amazonaws.com/freecodecamp/drums/Dry_Ohh.mp3"
  },
  {
    name:"Bld_H1",
    sound:"https://s3.amazonaws.com/freecodecamp/drums/Bld_H1.mp3"
  },
  {
    name:"punchy_kick_1",
    sound:"https://s3.amazonaws.com/freecodecamp/drums/punchy_kick_1.mp3"
  },
  {
    name:"side_stick_1",
    sound:"https://s3.amazonaws.com/freecodecamp/drums/side_stick_1.mp3"
  },
  {
    name:"Brk_Snr",
    sound:"https://s3.amazonaws.com/freecodecamp/drums/Brk_Snr.mp3"
  }
  ];
// ‘https://s3.amazonaws.com/freecodecamp/drums/Heater-1.mp3 ’


class DrumMachine extends React.Component {
  
  constructor(props) {
    super(props);
    this.state = {
      power:false,
      display: 'Turn the Power On',
      volume:0.4,
      bank:true
    };
    
     this.playSound = this.playSound.bind(this);
     this.keyPlaySound = this.keyPlaySound.bind(this);
     this.onOrOff = this.onOrOff.bind(this);
     this.changeVolume = this.changeVolume.bind(this);
    this.changeBank = this.changeBank.bind(this);
    
  };
 
  

  
  //the below function is for playing the audio. 
 playSound(event){
   if(this.state.power === true){
       const sound = event.target.lastChild //Grabs the last element in the Drum component which is the audio element.
       sound.parentElement.style.backgroundColor = "#51FF53";
       sound.volume = this.state.volume;
        setTimeout(() => { sound.parentElement.style.backgroundColor = '#A6FF51';}, 100);
        sound.currentTime = 0; 
        sound.play(); // plays the actual event after it has been clicked. 
       //Below changes the display. 
       this.setState({
         display: event.target.id
       })  
      };
   }
  
  keyPlaySound(event){
      const audioRec = document.getElementById(event.key.toUpperCase()); 
      if(audioRec !== null){ //If any of the keys that are pressed matches a div I.D proceed to second step
        audioRec.parentElement.click();// gets the parent element of audioRec which will be the Drum <input>.
      }; 
  }
  
  //Should toggle the Drum Machine between Power on and Power off.
  onOrOff(){
   if(this.state.power){
    this.setState({
      power:!this.state.power,
      display:"OFF"
    });
   }else{
     this.setState({
       display:"Initializing..."
     });
     //Below gives the illusion of a boot-up process when drum pad is powerd on.
     setTimeout(function(){
       this.setState({
       power:!this.state.power,
       display:"ON"
     });
    }.bind(this),1000)
   }
  }
  
      //Below function should control the volume
  changeVolume(event) {
    this.setState({
      volume: event.target.value
    });
  }
  changeBank(event) {
    this.setState({
      bank:!this.state.bank
    });
  }

  
  
    componentDidMount() {
    document.addEventListener("keydown", this.keyPlaySound);
  };
  
  componentWillUnmount() {
    document.removeEventListener("keydown", this.keyPlaySound);
  };
  
  render() {
    return(
    <div id="drum-machine">
      <div>
        <Display power={this.state.power} disp={this.state.display} />
      </div>
      <div>
        <Bank switchBank={this.state.bank} changeUrl={this.changeBank}/>
      </div>
      <div id="pads">
       {bankOne.map((word,index) => <Drum clicker={this.playSound} uniId={this.state.bank ? bankOne[index].name : bankTwo[index].name} kyPress={bankOne[index].key} sound={this.state.bank ? bankOne[index].sound : bankTwo[index].sound} />)}
      </div>
        <div id="bottomControl">
        <div class="footerControl">
          <Switch setPower={this.onOrOff} power={this.state.power} />
          <span class="caption">Power</span>
        </div>
        <div class="footerControl">
          <Volume  vol={this.state.volume} change={this.changeVolume} />
          <span class="caption">Volume</span>
        </div>
        </div>
 
    </div>
    )
  };
}
//On or Off button on the bottom of the screen
function Switch(props) {
  return (
    <button id="power" onClick={props.setPower}>
    {props.power ? "OFF" : "ON"}
    </button>
  );
}
//Displays Power on Or Off on the display.
function Display(props) {
  return (
    <div id="display">{props.disp}
      </div>
  );
}

function Bank(props) {
  return (
    <div id="bankContainer">
      <button id="bank" onClick={props.changeUrl}>{props.switchBank ? 'Bank One' : "Bank Two"}</button>
    </div>
  )
}

//plays sound and created Div for each element. 
function Drum(props) {
    return(
       <div className="drum-pad" id = {props.uniId}  onClick={props.clicker}>
       {props.kyPress}
       <audio id={props.kyPress} src={props.sound} />
     </div>
 )   
}         

function Volume(props){
  return(
    <input id="vol" type="range" id="vol" max="1" min="0" step="0.01" value={props.vol} onChange={props.change} />
  )
}


ReactDOM.render(
<DrumMachine />,document.getElementById('root'))
              
            
!
999px

Console