网络音频同时改变音量和频率

Web audio change volume and frequency at the same time

我正在尝试使用两个 "input range" 来改变音量和频率。

我可以分别控制它们,但不能同时应用到两者。我知道问题是我尝试同时设置目标 filter.connect(context.destination) 和 this.gainNode.connect(context.destination) 。如何处理?

这是HTML代码

<p><input type="range" min="0" max="100" value="100" onchange="sample.changeVolume(this);"> Volume</p>
<p><input type="checkbox" id="c1" checked="false" onchange="sample.toggleFilter(this);">
<p><input type="range" min="0" max="1" step="0.01" value="1" onchange="sample.changeFrequency(this);"> Frequency</p>

JavaScript代码

FilterSample.prototype.play = function() {
   this.gainNode = context.createGain();
   // Create the source.
   var source = context.createBufferSource();
   source.buffer = this.buffer;
   // Create the filter.
   var filter = context.createBiquadFilter();
   filter.type = filter.LOWPASS;
   filter.frequency.value = 5000;
   // Connect source to filter, filter to destination.
   source.connect(this.gainNode);
   this.gainNode.connect(context.destination);
   source.connect(filter);
   filter.connect(context.destination);

   // Play!
   source[source.start ? 'start' : 'noteOn'](0);
   source.loop = true;
   // Save source and filterNode for later access.
   this.source = source;
   this.filter = filter;
 };

尝试将它们连接成一条链:

source.connect(this.gainNode);        // source -> gain
this.gainNode.connect(filter);        // gain -> filter
filter.connect(context.destination);  // filter -> output

sample 的代码未显示,因此我们无法查看其中是否有任何错误)。