$ yarn add butterchurn butterchurn-presets
or
$ npm install butterchurn butterchurn-presets

import butterchurn from 'butterchurn';
import butterchurnPresets from 'butterchurn-presets';

// initialize audioContext and get canvas

const visualizer = butterchurn.createVisualizer(audioContext, canvas, {
  width: 800,
  height: 600
});

// get audioNode from audio source or microphone

visualizer.connectAudio(audioNode);

// load a preset

const presets = butterchurnPresets.getPresets();
const preset = presets['Flexi, martin + geiss - dedicated to the sherwin maxawow'];

visualizer.loadPreset(preset, 0.0); // 2nd argument is the number of seconds to blend presets

// resize visualizer

visualizer.setRendererSize(1600, 1200);

// render a frame

visualizer.render();

import isButterchurnSupported from "butterchurn/lib/isSupported.min";

if (isButterchurnSupported()) {
  // Load and use butterchurn
}

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