width -> pulseWidth

Change width to pulseWidth, update the example, keywords.txt and
gui/list.htm

examples/Synthesis/pulse/pulse.ino → examples/Synthesis/pulseWidth/pulseWidth.ino

-// demonstrate pulse with slow changes in width
+// demonstrate pulse with slow changes in pulse width
 
 #include <Audio.h>
 #include <Wire.h>
   audioShield.enable();
   audioShield.volume(0.45);
 
-  waveform1.width(0.5);
+  waveform1.pulseWidth(0.5);
   waveform1.begin(0.4, 220, WAVEFORM_PULSE);
 
   envelope1.attack(50);
   float w;
   for (uint32_t i =1; i<20; i++) {
     w = i / 20.0;
-    waveform1.width(w);
+    waveform1.pulseWidth(w);
     envelope1.noteOn();
     delay(800);
     envelope1.noteOff();

gui/list.html

 </script>
 <script type="text/x-red" data-help-name="AudioSynthWaveform">
 	<h3>Summary</h3>
-	<p>Create a waveform: sine, sawtooth, square, or triangle</p>
+	<p>Create a waveform: sine, sawtooth, square, triangle, pulse or arbitrary.</p>
 	<h3>Audio Connections</h3>
 	<table class=doc align=center cellpadding=3>
 		<tr class=top><th>Port</th><th>Purpose</th></tr>
 		<a href="http://www.pjrc.com/teensy/td_libs_AudioProcessorUsage.html" target="_blank">AudioNoInterrupts()</a>
 		should be used to guarantee all new settings take effect together.
 	</p>
+	<p class=func><span class=keyword>pulseWidth</span>(amount);</p>
+	<p class=desc>Change the width (duty cycle) of the pulse.</p>
 	<p class=func><span class=keyword>arbitraryWaveform</span>(array, maxFreq);</p>
 	<p class=desc>
 		Configure the waveform to be used with WAVEFORM_ARBITRARY.  Array
 		<li><span class=literal>WAVEFORM_SQUARE</span></li>
 		<li><span class=literal>WAVEFORM_TRIANGLE</span></li>
 		<li><span class=literal>WAVEFORM_ARBITRARY</span></li>
+		<li><span class=literal>WAVEFORM_PULSE</span></li>
 		</ul>
 	</p>
 </script>

keywords.txt

-Audio	KEYWORD2
+Audio	KEYWORD2
 AudioConnection	KEYWORD2
 AudioInputI2S	KEYWORD2
 AudioOutputI2S	KEYWORD2
 phase	KEYWORD2
 amplitude	KEYWORD2
 offset	KEYWORD2
+pulseWidth	KEYWORD2
 resonance	KEYWORD2
 octaveControl	KEYWORD2
 averageTogether	KEYWORD2
 WAVEFORM_SQUARE	LITERAL1
 WAVEFORM_TRIANGLE	LITERAL1
 WAVEFORM_ARBITRARY	LITERAL1
+WAVEFORM_PULSE	LITERAL1
 

synth_waveform.h

     else if (n > 1.0) n = 1.0;
     tone_offset = n * 32767.0;
   }
-  void width(float n) {          // 0.0 to 1.0
+  void pulseWidth(float n) {          // 0.0 to 1.0
     if (n < 0) n = 0;
     else if (n > 1.0) n = 1.0;
     tone_width = n * 0x7fffffffLL; 
-    // width is stored as the equivalent phase
+    // pulse width is stored as the equivalent phase
   }
   void begin(short t_type) {
 	tone_phase = 0;