Percobain/3d-audio-visualizer ? reverse-engineered prompt

Build me a web app that turns music or microphone input into a live 3D visualizer in the browser.

I want it to feel immersive and fun, with moving shapes or a visual scene that reacts in real time to the sound, like beats, volume, and frequency changes. Use a clean single page layout with a simple way to start the visualizer, and make it look good right away without needing much setup. It should work smoothly on modern browsers, use Web Audio and WebGL style visuals, and have a polished dark, neon kind of vibe.

If you need to look up current docs online, go ahead. Please make it so I can open the page and immediately see the audio driven animation working, with sensible controls and a nice responsive design for different screen sizes.