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diff --git a/src/com/jsyn/unitgen/Add.java b/src/com/jsyn/unitgen/Add.java
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+/*
+ * Copyright 2009 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;
+
+/**
+ * This unit performs a signed addition on its two inputs. <br>
+ * 
+ * <pre>
+ * output = inputA + inputB
+ * </pre>
+ * 
+ * <br>
+ * Note that signals connected to an InputPort are automatically added together so you may not need
+ * this unit.
+ * 
+ * @author Phil Burk (C) 2009 Mobileer Inc
+ * @version 016
+ * @see MultiplyAdd
+ * @see Subtract
+ */
+public class Add extends UnitBinaryOperator {
+
+    @Override
+    public void generate(int start, int limit) {
+        double[] aValues = inputA.getValues();
+        double[] bValues = inputB.getValues();
+        double[] outputs = output.getValues();
+
+        // System.out.println("adder = " + this);
+        // System.out.println("A = " + aValues[0]);
+        for (int i = start; i < limit; i++) {
+            outputs[i] = aValues[i] + bValues[i];
+        }
+        // System.out.println("add out = " + outputs[0]);
+    }
+}