Code for the Web Audi "monosynth" from my blog post (http://blog.chrislowis.co.uk/2013/06/05/playing-notes-web-audio-api.html)
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$(function () { | |
var keyboard = qwertyHancock({id: 'keyboard'}); | |
var context = new AudioContext(); | |
/* VCO */ | |
var vco = context.createOscillator(); | |
vco.type = vco.SINE; | |
vco.frequency.value = this.frequency; | |
vco.start(0); | |
/* VCA */ | |
var vca = context.createGain(); | |
vca.gain.value = 0; | |
/* Connections */ | |
vco.connect(vca); | |
vca.connect(context.destination); | |
var isEmpty = function(obj) { | |
return Object.keys(obj).length === 0; | |
} | |
depressed_keys = {} | |
keyboard.keyDown(function (note, frequency) { | |
vco.frequency.value = frequency; | |
vca.gain.value = 1; | |
depressed_keys[note] = true; | |
}); | |
keyboard.keyUp(function (note, _) { | |
delete depressed_keys[note]; | |
if (isEmpty(depressed_keys)) { | |
vca.gain.value = 0; | |
} | |
}); | |
}); |
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