Web Audio API向特定扬声器/通道播放声音

Question

我试图在环绕声系统中播放除左或右之外的特定扬声器的声音。我可以轻松地在左右声道之间切换，但无法从任何其他扬声器获得声音。试过Firefox和Chrome。

<script>
context = new AudioContext();
function playSound()
{
    var oscillator = context.createOscillator();
    oscillator.frequency.value = 440;
    var mergerNode = context.createChannelMerger(6);
    var silence = context.createBufferSource();
    silence.connect(mergerNode, 0, 0);
    silence.connect(mergerNode, 0, 1);
    silence.connect(mergerNode, 0, 2);
    silence.connect(mergerNode, 0, 3);
    silence.connect(mergerNode, 0, 4);
    oscillator.connect(mergerNode, 0, 5);
    mergerNode.connect(context.destination);
    currentTime = context.currentTime;
    oscillator.start(currentTime);
    oscillator.stop(currentTime + 2);    
}
playSound();
</script>