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diff --git a/src/com/jsyn/unitgen/PanControl.java b/src/com/jsyn/unitgen/PanControl.java
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+/*
+ * Copyright 1997 Phil Burk, Mobileer Inc
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ * 
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ * 
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.jsyn.unitgen;
+
+import com.jsyn.ports.UnitInputPort;
+import com.jsyn.ports.UnitOutputPort;
+
+/**
+ * PanControl unit.
+ * <P>
+ * Generates control signals that can be used to control a mixer or the amplitude ports of two
+ * units.
+ * 
+ * <PRE>
+ * temp = (pan * 0.5) + 0.5;
+ * output[0] = temp;
+ * output[1] = 1.0 - temp;
+ * </PRE>
+ * <P>
+ * 
+ * @author (C) 1997-2009 Phil Burk, SoftSynth.com
+ */
+public class PanControl extends UnitGenerator {
+    public UnitInputPort pan;
+    public UnitOutputPort output;
+
+    /* Define Unit Ports used by connect() and set(). */
+    public PanControl() {
+        addPort(pan = new UnitInputPort("Pan"));
+        addPort(output = new UnitOutputPort(2, "Output", 0.0));
+    }
+
+    @Override
+    public void generate(int start, int limit) {
+        double[] panPtr = pan.getValues();
+        double[] output0s = output.getValues(0);
+        double[] output1s = output.getValues(1);
+
+        for (int i = start; i < limit; i++) {
+            double gainB = (panPtr[i] * 0.5) + 0.5; /*
+                                                     * Scale and offset to 0.0 to 1.0
+                                                     */
+            output0s[i] = 1.0 - gainB;
+            output1s[i] = gainB;
+        }
+    }
+}