ass="lineno">   14</span>&#160;<span class="comment">State Variable Filter (approximation of Chamberlin version)</span></div><div class="line"><a name="l00015"></a><span class="lineno">   15</span>&#160;<span class="comment">Informed by pseudocode at http://www.musicdsp.org/showone.php?id=23 and</span></div><div class="line"><a name="l00016"></a><span class="lineno">   16</span>&#160;<span class="comment">http://www.musicdsp.org/showone.php?id=142. Here&#39;s the original:</span></div><div class="line"><a n