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diff --git a/tests/com/jsyn/examples/HearDAHDSR.java b/tests/com/jsyn/examples/HearDAHDSR.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 java.awt.GridLayout;
+
+import javax.swing.BorderFactory;
+import javax.swing.JApplet;
+
+import com.jsyn.JSyn;
+import com.jsyn.Synthesizer;
+import com.jsyn.ports.UnitInputPort;
+import com.jsyn.swing.DoubleBoundedRangeModel;
+import com.jsyn.swing.JAppletFrame;
+import com.jsyn.swing.PortModelFactory;
+import com.jsyn.swing.RotaryTextController;
+import com.jsyn.unitgen.EnvelopeDAHDSR;
+import com.jsyn.unitgen.LineOut;
+import com.jsyn.unitgen.SineOscillator;
+import com.jsyn.unitgen.SquareOscillator;
+import com.jsyn.unitgen.UnitOscillator;
+
+/**
+ * Play a tone using a JSyn oscillator. Modulate the amplitude using a DAHDSR envelope.
+ * 
+ * @author Phil Burk (C) 2010 Mobileer Inc
+ */
+public class HearDAHDSR extends JApplet {
+    private static final long serialVersionUID = -2704222221111608377L;
+    private Synthesizer synth;
+    private UnitOscillator osc;
+    // Use a square wave to trigger the envelope.
+    private UnitOscillator gatingOsc;
+    private EnvelopeDAHDSR dahdsr;
+    private LineOut lineOut;
+
+    @Override
+    public void init() {
+        synth = JSyn.createSynthesizer();
+
+        // Add a tone generator.
+        synth.add(osc = new SineOscillator());
+        // Add a trigger.
+        synth.add(gatingOsc = new SquareOscillator());
+        // Use an envelope to control the amplitude.
+        synth.add(dahdsr = new EnvelopeDAHDSR());
+        // Add an output mixer.
+        synth.add(lineOut = new LineOut());
+
+        gatingOsc.output.connect(dahdsr.input);
+        dahdsr.output.connect(osc.amplitude);
+        dahdsr.attack.setup(0.001, 0.01, 2.0);
+        osc.output.connect(0, lineOut.input, 0);
+        osc.output.connect(0, lineOut.input, 1);
+
+        gatingOsc.frequency.setup(0.001, 0.5, 10.0);
+        gatingOsc.frequency.setName("Rate");
+
+        osc.frequency.setup(50.0, 440.0, 2000.0);
+        osc.frequency.setName("Freq");
+
+        // Arrange the knob in a row.
+        setLayout(new GridLayout(1, 0));
+
+        setupPortKnob(osc.frequency);
+        setupPortKnob(gatingOsc.frequency);
+        setupPortKnob(dahdsr.attack);
+        setupPortKnob(dahdsr.hold);
+        setupPortKnob(dahdsr.decay);
+        setupPortKnob(dahdsr.sustain);
+        setupPortKnob(dahdsr.release);
+
+        validate();
+    }
+
+    private void setupPortKnob(UnitInputPort port) {
+
+        DoubleBoundedRangeModel model = PortModelFactory.createExponentialModel(port);
+        System.out.println("Make knob for " + port.getName() + ", model.getDV = "
+                + model.getDoubleValue() + ", model.getV = " + model.getValue() + ", port.getV = "
+                + port.get());
+        RotaryTextController knob = new RotaryTextController(model, 10);
+        knob.setBorder(BorderFactory.createTitledBorder(port.getName()));
+        knob.setTitle(port.getName());
+        add(knob);
+    }
+
+    @Override
+    public void start() {
+        // Start synthesizer using default stereo output at 44100 Hz.
+        synth.start();
+        // We only need to start the LineOut. It will pull data from the
+        // oscillator.
+        lineOut.start();
+    }
+
+    @Override
+    public void stop() {
+        synth.stop();
+    }
+
+    /* Can be run as either an application or as an applet. */
+    public static void main(String args[]) {
+        HearDAHDSR applet = new HearDAHDSR();
+        JAppletFrame frame = new JAppletFrame("Hear DAHDSR Envelope", applet);
+        frame.setSize(640, 200);
+        frame.setVisible(true);
+        frame.test();
+    }
+
+}