Further changes to address #67 and #68.

index.html

@@ -1256,7 +1256,7 @@ <h2 id="AudioContext">
             disabled, and the time-domain waveform has the amplitudes as given
             by the Fourier coefficients.
             <p>
-              As <a>PeriodicWave</a> objects maintain their own representation,
+              As <a>PeriodicWave</a> objects maintain their own copies of these arrays,
               any modification of the arrays uses as the <code>real</code> and
               <code>imag</code> parameters after the call to <a href=
               "#widl-AudioContext-createPeriodicWave-PeriodicWave-Float32Array-real-Float32Array-imag">
@@ -2473,9 +2473,10 @@ <h2 id="AudioParam">
               <dd>
                 A Float32Array representing a parameter value curve. These
                 values will apply starting at the given time and lasting for
-                the given duration. Any modification to the the array used as
-                <a id="#dfn-values"><code>values</code></a> argument after the
-                call won't have any effect on the <a>AudioParam</a>.
+                the given duration. 
+                When this method is called, an internal copy of the curve is created
+                for automation purposes. Subsequent modifications of the
+                contents of the passed-in array therefore have no effect on the the <a>AudioParam</a>.
               </dd>
               <dt>
                 double startTime