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diff --git a/src/main/java/com/jsyn/unitgen/Integrate.java b/src/main/java/com/jsyn/unitgen/Integrate.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;
+
+/**
+ * IntegrateUnit unit.
+ * <P>
+ * Output accumulated sum of the input signal. This can be used to transform one signal into
+ * another, or to generate ramps between the limits by setting the input signal positive or
+ * negative. For a "leaky integrator" use a FilterOnePoleOneZero.
+ * </P>
+ *
+ * <pre>
+ * output = output + input;
+ * if (output &lt; lowerLimit)
+ *     output = lowerLimit;
+ * else if (output &gt; upperLimit)
+ *     output = upperLimit;
+ * </pre>
+ *
+ * @author (C) 1997-2011 Phil Burk, Mobileer Inc
+ * @see FilterOnePoleOneZero
+ */
+public class Integrate extends UnitGenerator {
+    public UnitInputPort input;
+    /**
+     * Output will be stopped internally from going below this value. Default is -1.0.
+     */
+    public UnitInputPort lowerLimit;
+    /**
+     * Output will be stopped internally from going above this value. Default is +1.0.
+     */
+    public UnitInputPort upperLimit;
+    public UnitOutputPort output;
+
+    private double accum;
+
+    /* Define Unit Ports used by connect() and set(). */
+    public Integrate() {
+        addPort(input = new UnitInputPort("Input"));
+        addPort(lowerLimit = new UnitInputPort("LowerLimit", -1.0));
+        addPort(upperLimit = new UnitInputPort("UpperLimit", 1.0));
+        addPort(output = new UnitOutputPort("Output"));
+    }
+
+    @Override
+    public void generate(int start, int limit) {
+        double[] inputs = input.getValues();
+        double[] lowerLimits = lowerLimit.getValues();
+        double[] upperLimits = upperLimit.getValues();
+        double[] outputs = output.getValues();
+
+        for (int i = start; i < limit; i++) {
+            accum += inputs[i]; // INTEGRATE
+
+            // clip to limits
+            if (accum > upperLimits[i])
+                accum = upperLimits[i];
+            else if (accum < lowerLimits[i])
+                accum = lowerLimits[i];
+
+            outputs[i] = accum;
+        }
+    }
+}