Document AudioEffectRectifier

gui/index.html

 		{"type":"AudioEffectFreeverbStereo","data":{"defaults":{"name":{"value":"new"}},"shortName":"freeverbs","inputs":1,"outputs":2,"category":"effect-function","color":"#E6E0F8","icon":"arrow-in.png"}},
 		{"type":"AudioEffectEnvelope","data":{"defaults":{"name":{"value":"new"}},"shortName":"envelope","inputs":1,"outputs":1,"category":"effect-function","color":"#E6E0F8","icon":"arrow-in.png"}},
 		{"type":"AudioEffectMultiply","data":{"defaults":{"name":{"value":"new"}},"shortName":"multiply","inputs":2,"outputs":1,"category":"effect-function","color":"#E6E0F8","icon":"arrow-in.png"}},
+		{"type":"AudioEffectRectifier","data":{"defaults":{"name":{"value":"new"}},"shortName":"rectify","inputs":1,"outputs":1,"category":"effect-function","color":"#E6E0F8","icon":"arrow-in.png"}},
 		{"type":"AudioEffectDelay","data":{"defaults":{"name":{"value":"new"}},"shortName":"delay","inputs":1,"outputs":8,"category":"effect-function","color":"#E6E0F8","icon":"arrow-in.png"}},
 		{"type":"AudioEffectDelayExternal","data":{"defaults":{"name":{"value":"new"}},"shortName":"delayExt","inputs":1,"outputs":8,"category":"effect-function","color":"#E6E0F8","icon":"arrow-in.png"}},
 		{"type":"AudioEffectBitcrusher","data":{"shortName":"bitcrusher","inputs":1,"outputs":1,"category":"effect-function","color":"#E6E0F8","icon":"arrow-in.png"}},
 	</div>
 </script>
 
+<script type="text/x-red" data-help-name="AudioEffectRectifier">
+	<h3>Summary</h3>
+	<div class=tooltipinfo>
+	<p>Pass only the positive portion of a waveform
+	</p>
+	</div>
+	<h3>Audio Connections</h3>
+	<table class=doc align=center cellpadding=3>
+		<tr class=top><th>Port</th><th>Purpose</th></tr>
+		<tr class=odd><td align=center>In 0</td><td>Signal Input</td></tr>
+		<tr class=odd><td align=center>Out 0</td><td>Rectifed (positive only) Signal</td></tr>
+	</table>
+	<h3>Functions</h3>
+	<p>There are no functions to call from the Arduino sketch.
+		This object simply passes the positive portion of the
+		signal and outputs zero when the input is negative.
+	</p>
+<h3>Examples</h3>
+	<p class=exam>File &gt; Examples &gt; Audio &gt; Effects &gt; Vocoder19Band
+	</p>
+	<h3>Notes</h3>
+	<p>
+    </p>
+</script>
+<script type="text/x-red" data-template-name="AudioEffectRectifier">
+	<div class="form-row">
+		<label for="node-input-name"><i class="fa fa-tag"></i> Name</label>
+		<input type="text" id="node-input-name" placeholder="Name">
+	</div>
+</script>
+
 <script type="text/x-red" data-help-name="AudioEffectDelay">
 	<h3>Summary</h3>
 	<div class=tooltipinfo>