Audio experiments

Sound to listen to, look at, and change. About these experiments.

Sound tools and studies

Newest first

Try a sound, then change it or watch what it draws. Each experiment's How it works explains the controls, the signal behind them, and the limits.

Nov 11, 2026 Experiment

Echo tuner

Shape an echo with delay time, feedback, mix, and tone. Try a synthesized test sound or use your microphone with headphones on your phone, tablet, or computer.

May 28, 2026 Experiment

Heartbeat synthesizer

Explore camera-based pulse detection as a sound experiment with synth clicks, stereo tones, and MIDI clock. An educational demo, not a medical heart-rate monitor.

Jun 15, 2025 Experiment

Ambient audio visualizer

See microphone sound as colored frequency bars. Learn how a Web Audio analyser turns short sound samples into a spectrum, and how that differs from a waveform.

Jun 15, 2025 Experiment

3D audio visualizer

Turn microphone input into rotating 3D frequency bars with Web Audio and Three.js. Explore how frequency bins control bar height and color.

Listening and looking

The echo tuner sends a sound back after a delay. Shorten the gap to bring the repeats together, or lengthen it to hear them separately. Its test note works without microphone access. Use headphones if you try it with your voice.

A sound can contain many frequencies at once. The flat visualizer and 3D visualizer split microphone sound into bands and draw their levels as bars. Hum, speak, or clap and compare the patterns. These are pictures of frequency levels, not note detectors or calibrated sound meters.

The heartbeat synthesizer goes the other way: it looks for brightness changes through the camera and uses the detected timing to make sound. Movement and lighting can change the result. It's a sound experiment, not a medical monitor.

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