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diff --git a/tests/com/jsyn/examples/CustomCubeUnit.java b/tests/com/jsyn/examples/CustomCubeUnit.java
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+/*
+ * Copyright 2010 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.examples;
+
+import com.jsyn.unitgen.UnitFilter;
+
+/**
+ * Custom unit generator that can be used with other JSyn units. Cube the input value and write it
+ * to output port.
+ * 
+ * @author Phil Burk (C) 2010 Mobileer Inc
+ */
+public class CustomCubeUnit extends UnitFilter {
+
+    @Override
+    /** This is where the synthesis occurs.
+     * It is called in a high priority background thread so do not do
+     * anything crazy here like reading a file or doing network I/O.
+     * Just do fast arithmetic.
+     * <br>
+     * The start and limit allow us to do either block or single sample processing.
+     */
+    public void generate(int start, int limit) {
+        // Get signal arrays from ports.
+        double[] inputs = input.getValues();
+        double[] outputs = output.getValues();
+
+        for (int i = start; i < limit; i++) {
+            double x = inputs[i];
+            // Do the math.
+            outputs[i] = x * x * x;
+        }
+    }
+}