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diff --git a/tests/com/jsyn/research/RecordVariousRamps.java b/tests/com/jsyn/research/RecordVariousRamps.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.
+ */
+/** 
+ * Generate steps, linear ramps and smooth ramps.
+ *
+ * @author (C) 2014 Phil Burk
+ */
+
+package com.jsyn.research;
+
+import java.io.File;
+import java.io.IOException;
+
+import com.jsyn.JSyn;
+import com.jsyn.Synthesizer;
+import com.jsyn.unitgen.ContinuousRamp;
+import com.jsyn.unitgen.LineOut;
+import com.jsyn.unitgen.LinearRamp;
+import com.jsyn.unitgen.Multiply;
+import com.jsyn.unitgen.PassThrough;
+import com.jsyn.unitgen.PowerOfTwo;
+import com.jsyn.unitgen.SawtoothOscillatorBL;
+import com.jsyn.unitgen.UnitFilter;
+import com.jsyn.unitgen.UnitOscillator;
+import com.jsyn.util.WaveRecorder;
+
+public class RecordVariousRamps {
+    private Synthesizer synth;
+    private UnitOscillator osc;
+    private Multiply multiplier;
+    private UnitFilter ramp;
+    private LinearRamp linearRamp;
+    private ContinuousRamp continuousRamp;
+    private LineOut lineOut;
+    private WaveRecorder recorder;
+    private PowerOfTwo powerOfTwo;
+    private static final int MODE_STEP = 0;
+    private static final int MODE_LINEAR = 1;
+    private static final int MODE_SMOOTH = 2;
+    private static final String[] modeNames = {
+            "step", "linear", "smooth"
+    };
+
+    private RampEvent[] rampData = {
+            new RampEvent(1.0, 1.5, 2.0), new RampEvent(-0.9, 0.5, 1.0),
+            new RampEvent(0.9, 0.5, 0.8), new RampEvent(-0.3, 0.5, 0.8),
+            new RampEvent(0.9, 0.5, 0.3), new RampEvent(-0.5, 0.5, 0.3),
+            new RampEvent(0.8, 2.0, 1.0),
+    };
+
+    private static class RampEvent {
+        double target;
+        double eventDuration;
+        double rampDuration;
+
+        RampEvent(double target, double eventDuration, double rampDuration) {
+            this.target = target;
+            this.eventDuration = eventDuration;
+            this.rampDuration = rampDuration;
+        }
+    }
+
+    private void test(int mode) throws IOException {
+        // Create a context for the synthesizer.
+        synth = JSyn.createSynthesizer();
+        synth.setRealTime(false);
+
+        File waveFile = new File("ramp_pitch_" + modeNames[mode] + ".wav");
+        // Mono 16 bits.
+        recorder = new WaveRecorder(synth, waveFile, 1, 16);
+        System.out.println("Writing to 16-bit WAV file " + waveFile.getAbsolutePath());
+
+        // Add some tone generators.
+        synth.add(osc = new SawtoothOscillatorBL());
+
+        // Add a controller that will sweep up.
+        synth.add(multiplier = new Multiply());
+        synth.add(powerOfTwo = new PowerOfTwo());
+        // Add an output unit.
+        synth.add(lineOut = new LineOut());
+        multiplier.inputB.set(660.0);
+
+        switch (mode) {
+            case MODE_STEP:
+                synth.add(ramp = new PassThrough());
+                break;
+            case MODE_LINEAR:
+                synth.add(ramp = linearRamp = new LinearRamp());
+                linearRamp.current.set(-1.0);
+                linearRamp.time.set(10.0);
+                break;
+            case MODE_SMOOTH:
+                synth.add(ramp = continuousRamp = new ContinuousRamp());
+                continuousRamp.current.set(-1.0);
+                continuousRamp.time.set(10.0);
+                break;
+        }
+
+        ramp.getInput().set(-1.0);
+        ramp.getOutput().connect(powerOfTwo.input);
+
+        powerOfTwo.output.connect(multiplier.inputA);
+        multiplier.output.connect(osc.frequency);
+
+        // Connect the oscillator to the left and right audio output.
+        osc.output.connect(0, lineOut.input, 0);
+        osc.output.connect(0, lineOut.input, 1);
+
+        // Start synthesizer using default stereo output at 44100 Hz.
+        synth.start();
+
+        osc.output.connect(0, recorder.getInput(), 0);
+        // When we start the recorder it will pull data from the oscillator
+        // and sweeper.
+        recorder.start();
+
+        // We also need to start the LineOut if we want to hear it now.
+        lineOut.start();
+
+        // Get synthesizer time in seconds.
+        double nextEventTime = synth.getCurrentTime() + 1.0;
+        try {
+            synth.sleepUntil(nextEventTime);
+        } catch (InterruptedException e) {
+            e.printStackTrace();
+        }
+
+        for (RampEvent rampEvent : rampData) {
+
+            switch (mode) {
+                case MODE_STEP:
+                    break;
+                case MODE_LINEAR:
+                    linearRamp.time.set(rampEvent.rampDuration);
+                    break;
+                case MODE_SMOOTH:
+                    continuousRamp.time.set(rampEvent.rampDuration);
+                    break;
+            }
+            ramp.getInput().set(rampEvent.target);
+
+            nextEventTime += rampEvent.eventDuration;
+            System.out.println("target = " + rampEvent.target + ", rampDur = "
+                    + rampEvent.rampDuration + ", eventDur = " + rampEvent.eventDuration);
+            try {
+                synth.sleepUntil(nextEventTime);
+            } catch (InterruptedException e) {
+                e.printStackTrace();
+            }
+        }
+
+        if (recorder != null) {
+            recorder.stop();
+            recorder.close();
+        }
+        // Stop everything.
+        synth.stop();
+    }
+
+    public static void main(String[] args) {
+        try {
+            new RecordVariousRamps().test(MODE_STEP);
+            new RecordVariousRamps().test(MODE_LINEAR);
+            new RecordVariousRamps().test(MODE_SMOOTH);
+        } catch (IOException e) {
+            e.printStackTrace();
+        }
+    }
+
+}