Connecting a simple gain node to Web Audio API file buffers - web-audio-api

Question

I can't seem to understand why this isn't working. I have no errors.I have done this using oscillators and it works fine. FYI this is a continuation of this thread:
Using Web Audio API to assign two sounds to two Divs and play each independently via a click event with javascript
Code:
<div id="divElement"></div>
<style>
#divElement{
background-color: orange;
width:70px;
height:100px;
left:143px;
}
</style>
<script>
var context = new webkitAudioContext(),
savedBuffer;
var playAudioFile = function () {
var source = context.createBufferSource();
var gainNode = context.createGainNode();
source.buffer = savedBuffer;
// START OF PROBLEM AREA: Gain not working but file still plays with no errors.
source.connect(gainNode);
gainNode.connect(context.destination);
gainNode.gain = 0;
// END OF PROBLEM AREA
source.noteOn(0); // Play sound immediately
};
var request = new XMLHttpRequest();
request.open('get', 'audio/A.mp3', true);
request.responseType = 'arraybuffer';
request.onload = function () {
context.decodeAudioData(request.response,
function(incomingBuffer) {
savedBuffer = incomingBuffer;
var divElement = document.getElementById("divElement");
divElement.addEventListener("click", playAudioFile , false);
}
);
};
request.send();
</script>

Answer 1

Try gainNode.gain.value = 0 instead. gainNode.gain is an AudioGain object, which has the attribute value.
http://www.w3.org/TR/webaudio/#AudioGainNode