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diff --git a/src/com/jsyn/unitgen/SpectralProcessor.java b/src/com/jsyn/unitgen/SpectralProcessor.java
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+/*
+ * Copyright 2014 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.data.Spectrum;
+import com.jsyn.ports.UnitSpectralInputPort;
+import com.jsyn.ports.UnitSpectralOutputPort;
+
+/**
+ * This is a base class for implementing your own spectral processing units. You need to implement
+ * the processSpectrum() method.
+ * 
+ * @author Phil Burk (C) 2014 Mobileer Inc
+ * @see Spectrum
+ */
+public abstract class SpectralProcessor extends UnitGenerator {
+    public UnitSpectralInputPort input;
+    public UnitSpectralOutputPort output;
+    private int counter;
+
+    /* Define Unit Ports used by connect() and set(). */
+    public SpectralProcessor() {
+        addPort(output = new UnitSpectralOutputPort());
+        addPort(input = new UnitSpectralInputPort());
+    }
+
+    /* Define Unit Ports used by connect() and set(). */
+    public SpectralProcessor(int size) {
+        addPort(output = new UnitSpectralOutputPort(size));
+        addPort(input = new UnitSpectralInputPort());
+    }
+
+    @Override
+    public void generate(int start, int limit) {
+        for (int i = start; i < limit; i++) {
+            if (counter == 0) {
+                if (input.isAvailable()) {
+                    Spectrum inputSpectrum = input.getSpectrum();
+                    Spectrum outputSpectrum = output.getSpectrum();
+                    processSpectrum(inputSpectrum, outputSpectrum);
+
+                    output.advance();
+                    counter = inputSpectrum.size() - 1;
+                }
+            } else {
+                counter--;
+            }
+        }
+    }
+
+    /**
+     * Define this method to implement your own processor.
+     * 
+     * @param inputSpectrum
+     * @param outputSpectrum
+     */
+    public abstract void processSpectrum(Spectrum inputSpectrum, Spectrum outputSpectrum);
+
+}