Remove dezippering.

This fixes #76.

index.html

@@ -1960,12 +1960,6 @@ <h2 id="GainNode">The GainNode Interface</h2>
   the <a href="#widl-GainNode-gain"><code>gain</code></a> <a><code>AudioParam</code></a>.
 </p>
 
-<p>
-  The implementation must make gain changes to the audio stream smoothly,
-  without introducing noticeable clicks or glitches. This process is called
-  "de-zippering".
-</p>
-
 <dl title="interface GainNode : AudioNode" class="idl">
   <dt>readonly attribute AudioParam gain</dt>
   <dd>
@@ -2001,9 +1995,7 @@ <h2 id="DelayNode">The DelayNode Interface</h2>
   time <em>t</em>, input signal <em>input(t)</em>, delay time
   <em>delayTime(t)</em> and output signal <em>output(t)</em>, the output will be
   <em> output(t) = input(t - delayTime(t))</em>. The default
-  <code>delayTime</code> is 0 seconds (no delay). When the delay time is
-  changed, the implementation must make the transition smoothly, without
-  introducing noticeable clicks or glitches to the audio stream.
+  <code>delayTime</code> is 0 seconds (no delay).
 </p>
 
 <dl title="interface DelayNode : AudioNode" class="idl">
@@ -5975,6 +5967,20 @@ <h3>Audio buffer copying</h3>
 </p>
 </section>
 
+<section class=informative>
+<h3>AudioParam transitions</h3>
+<p>
+  While no automatic smoothing is done when directly setting the
+  <a><code>value</code></a> attribute of an <a><code>AudioParam</code></a>, for
+  certain parameters, smooth transition are preferable to directly setting
+  the value.
+</p>
+<p>
+  Using the <a><code>setTargetAtTime</code></a> method with a low
+  <code>timeConstant</code> allows authors to a perform smooth transition.
+</p>
+</section>
+
 <section>
   <h3>Audio Glitching</h3>