Web Audio Example

webAudio.js

var context=  new (window.AudioContext || window.webkitAudioContext)();
var oscillator = context.createOscillator();
oscillator.frequency.value = 5000;
oscillator.start();
oscillator.connect(context.destination);

// Only be heard by those under 40
// oscillator.frequency.value = 15000;

// Only be heard by those under 18
//oscillator.frequency.value = 17500;