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Theremin

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About

A theremin you play by dragging: left-to-right is pitch across three octaves, top-to-bottom is volume. Switch waveform for a purer or buzzier tone. Sound only plays while you're touching the pad.

How it works

A single Web Audio OscillatorNode into a GainNode; pointer X maps to frequency (110 Hz up three octaves, logarithmic), pointer Y to gain, both smoothed with setTargetAtTime. The audio context is created on your first touch (no autoplay). No backend.

Metadata
title
Theremin
description
Play a browser theremin — drag across the pad and X sets the pitch, Y the volume. Four waveforms, in the browser with the Web Audio API.
canonical
https://kaspirius.com/theremin
updated
Last updated
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TechArticle

Same as Article, flagged as technical/developer reference material.

{
  "@context": "https://schema.org",
  "@type": "TechArticle",
  "headline": "Theremin — sound",
  "description": "Play a browser theremin — drag across the pad and X sets the pitch, Y the volume. Four waveforms, in the browser with the Web Audio API.",
  "url": "https://kaspirius.com/theremin",
  "mainEntityOfPage": {
    "@type": "WebPage",
    "@id": "https://kaspirius.com/theremin"
  },
  "datePublished": "2026-06-18",
  "dateModified": "2026-06-18",
  "author": {
    "@type": "Person",
    "name": "kaspirius",
    "url": "https://kaspirius.com"
  },
  "publisher": {
    "@type": "Organization",
    "name": "kaspirius",
    "url": "https://kaspirius.com"
  }
}
↖ kaspirius