JSFiddle - React, Tailwind, and code Playground

HTML

<script src="https://mz4u.net/libs/posnd/pomidi.js"></script>

JavaScript

(async ()=>{
  var midi = await new pomidi();
  midi.sendNoteOn(30);
  await midi.wait(100);
  midi.sendNoteOn(32);
  await midi.wait(100);
  midi.sendNoteOn(34);
  await midi.wait(100);
  midi.sendNoteOn(36);
  await midi.wait(100);
  midi.sendNoteOn(38);
})();