One chromatic octave · C4 – C5 · synthesized with Tone.js
Press the computer keys A W S E D F T G Y H U J K to play, or click / tap the keys. Hold for sustain, release to hear the envelope release. Releasing the mouse anywhere, or leaving the window, releases every held note.
Browsers require a user gesture before sound can play. Everything is synthesized in the browser with Tone.js — no audio files are used.