HTMLMediaElement: свойство preservesPitch

<audio
  controls
  src="https://mdn.github.io/webaudio-examples/audio-basics/outfoxing.mp3"></audio>

<div>
  <label for="rate">Adjust playback rate:</label>
  <input id="rate" type="range" min="0.25" max="3" step="0.05" value="1" />
</div>

<div>
  <label for="pitch">Preserve pitch:</label>
  <input type="checkbox" id="pitch" name="pitch" checked />
</div>

const audio = document.querySelector("audio");
document.getElementById("rate").addEventListener("change", (e) => {
  audio.playbackRate = e.target.value;
});
document.getElementById("pitch").addEventListener("change", (e) => {
  audio.preservesPitch = e.target.checked;
});