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diff --git a/src/main/java/com/jsyn/unitgen/UnitOscillator.java b/src/main/java/com/jsyn/unitgen/UnitOscillator.java
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+++ b/src/main/java/com/jsyn/unitgen/UnitOscillator.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;
+
+import com.jsyn.ports.UnitInputPort;
+import com.jsyn.ports.UnitOutputPort;
+import com.jsyn.ports.UnitVariablePort;
+import com.softsynth.shared.time.TimeStamp;
+
+/**
+ * Base class for all oscillators.
+ *
+ * @author Phil Burk (C) 2009 Mobileer Inc
+ */
+public abstract class UnitOscillator extends UnitGenerator implements UnitVoice {
+    /** Frequency in Hertz. */
+    public UnitInputPort frequency;
+    public UnitInputPort amplitude;
+    public UnitVariablePort phase;
+    public UnitOutputPort output;
+
+    public static final double DEFAULT_FREQUENCY = 440.0;
+    public static final double DEFAULT_AMPLITUDE = 1.0;
+
+    /* Define Unit Ports used by connect() and set(). */
+    public UnitOscillator() {
+        addPort(frequency = new UnitInputPort(PORT_NAME_FREQUENCY));
+        frequency.setup(40.0, DEFAULT_FREQUENCY, 8000.0);
+        addPort(amplitude = new UnitInputPort(PORT_NAME_AMPLITUDE, DEFAULT_AMPLITUDE));
+        addPort(phase = new UnitVariablePort(PORT_NAME_PHASE));
+        addPort(output = new UnitOutputPort(PORT_NAME_OUTPUT));
+    }
+
+    /**
+     * Convert a frequency in Hertz to a phaseIncrement in the range -1.0 to +1.0
+     */
+    public double convertFrequencyToPhaseIncrement(double freq) {
+        double phaseIncrement;
+        try {
+            phaseIncrement = freq * synthesisEngine.getInverseNyquist();
+        } catch (NullPointerException e) {
+            throw new NullPointerException(
+                    "Null Synth! You probably forgot to add this unit to the Synthesizer!");
+        }
+        // Clip to range.
+        phaseIncrement = (phaseIncrement > 1.0) ? 1.0 : ((phaseIncrement < -1.0) ? -1.0
+                : phaseIncrement);
+        return phaseIncrement;
+    }
+
+    @Override
+    public UnitOutputPort getOutput() {
+        return output;
+    }
+
+    public void noteOn(double freq, double ampl) {
+        frequency.set(freq);
+        amplitude.set(ampl);
+    }
+
+    public void noteOff() {
+        amplitude.set(0.0);
+    }
+
+    @Override
+    public void noteOff(TimeStamp timeStamp) {
+        amplitude.set(0.0, timeStamp);
+    }
+
+    @Override
+    public void noteOn(double freq, double ampl, TimeStamp timeStamp) {
+        frequency.set(freq, timeStamp);
+        amplitude.set(ampl, timeStamp);
+    }
+
+    @Override
+    public void usePreset(int presetIndex) {
+    }
+}