Add these two tags to your page — before </body> or in <head> :
</body>
<head>
<script src="https://cdn.chiptune-synth.8binami.com/3.0.0/chiptune-synth.min.js"></script>
<script src="https://cdn.chiptune-synth.8binami.com/3.0.0/chiptune-sound-font.min.js"></script>