strudel-docker/packages/webaudio/examples/repl.html

<div style="position: absolute; top: 0; right: 0; padding: 4px">
  <button id="start" style="margin-bottom: 4px; font-size: 2em">start</button><br />
  <button id="stop" style="font-size: 2em">stop</button>
</div>
<textarea
  style="font-size: 2em; background: #e8d565; color: #323230; height: 100%; width: 100%; outline: none; border: 0"
  id="text"
  spellcheck="false"
>
Loading...</textarea
>
<script type="module">
  document.body.style = 'margin: 0';
  import * as strudel from '@strudel.cycles/core';
  import '@strudel.cycles/core/euclid.mjs';
  import { Scheduler, getAudioContext } from '@strudel.cycles/webaudio';

  const { cat, State, TimeSpan } = strudel;
  Object.assign(window, strudel); // add strudel to eval scope

  const audioContext = getAudioContext();
  const interval = 0.1;
  const lookahead = 0.5;
  const scheduler = new Scheduler(audioContext, interval, lookahead);

  let initialCode = `sequence(1,2).mul(55/2) // frequencies
.mul(slowcat(1,2))
.mul(slowcat(1,3/2,4/3,5/3).slow(8))
.fast(3)
.velocity(.5)
.osc(cat('sawtooth','square').fast(2))
.adsr(0.01,.02,.5,0.1)
.filter('lowshelf',800,25)
.out()`;

  try {
    const base64 = decodeURIComponent(window.location.href.split('#')[1]);
    initialCode = atob(base64);
  } catch (err) {
    console.warn('failed to decode', err);
  }
  const input = document.getElementById('text');
  input.value = initialCode;
  const evaluate = () => {
    try {
      const pattern = eval(input.value);
      console.log('value', input.value);

      console.log('pattern', pattern);

      scheduler.setPattern(pattern);
      window.location.hash = '#' + encodeURIComponent(btoa(input.value)); // update url hash
    } catch (err) {
      console.warn(err);
    }
  };
  evaluate();
  input.addEventListener('input', () => evaluate());

  document.getElementById('start').addEventListener('click', () => scheduler.start());
  document.getElementById('stop').addEventListener('click', () => scheduler.stop());
</script>