Module widgets/frequency-analyzer

Example:

const audioElement = document.getElementById('audio');
const viewElement = document.getElementById('div-analyzer');

const f = new FrequencyAnalyzer(audioElement, viewElement, { fftSize: 256,  color: '#ffb21d' });

// We can start only after user starts interact with our page.
// This is because of HTML Web Audio API restriction.
document.body.onclick = () => {
  audioElement.play();
  f.start();
}

See more options at interface definition: IAbstractAnalyzerOptions