working pitch shift

working pitch shift.js

import "./styles.css";
import { useEffect, useState } from "react";
import * as Tone from "tone";

export default function App() {
  const [filter, setFilter] = useState<Tone.PitchShift | undefined>(undefined);
  const [pitch, setPitch] = useState(1);

  async function init() {
    const stream = await navigator.mediaDevices.getUserMedia({ audio: true });

    const source = Tone.context.createMediaStreamSource(stream);
    const filter = new Tone.PitchShift().toDestination();
    setFilter(filter);

    Tone.connect(source, filter);
  }

  useEffect(() => {
    init();
  }, []);

  return (
    <div className="App">
      <input
        type="range"
        min={-10}
        max={10}
        value={pitch}
        onChange={(event) => {
          const pitch = parseInt(event.target.value, 10);
          setPitch(pitch);
          if (filter) {
            filter.pitch = pitch;
          }
        }}
      />
      <h1>Hello CodeSandbox {pitch}</h1>
      <h2>Start editing to see some magic happen!</h2>
    </div>
  );
}