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diff --git a/tests/com/jsyn/examples/FFTPassthrough.java b/tests/com/jsyn/examples/FFTPassthrough.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.JSyn;
+import com.jsyn.Synthesizer;
+import com.jsyn.unitgen.LineOut;
+import com.jsyn.unitgen.PassThrough;
+import com.jsyn.unitgen.SineOscillator;
+import com.jsyn.unitgen.SpectralFFT;
+import com.jsyn.unitgen.SpectralIFFT;
+import com.jsyn.unitgen.UnitOscillator;
+
+/**
+ * Play a sine sweep through an FFT/IFFT pair.
+ * 
+ * @author Phil Burk (C) 2010 Mobileer Inc
+ */
+public class FFTPassthrough {
+    private Synthesizer synth;
+    private PassThrough center;
+    private UnitOscillator osc;
+    private UnitOscillator lfo;
+    private SpectralFFT fft;
+    private SpectralIFFT ifft1;
+    private LineOut lineOut;
+    private SpectralIFFT ifft2;
+
+    private void test() {
+        // Create a context for the synthesizer.
+        synth = JSyn.createSynthesizer();
+
+        // Start synthesizer using default stereo output at 44100 Hz.
+        synth.start();
+
+        // Add a tone generator.
+        synth.add(center = new PassThrough());
+        // synth.add( osc = new SawtoothOscillatorBL() );
+        synth.add(osc = new SineOscillator());
+        synth.add(lfo = new SineOscillator());
+        synth.add(fft = new SpectralFFT());
+        synth.add(ifft1 = new SpectralIFFT());
+        synth.add(ifft2 = new SpectralIFFT());
+        // Add a stereo audio output unit.
+        synth.add(lineOut = new LineOut());
+
+        // Connect the oscillator to both channels of the output.
+        center.output.connect(osc.frequency);
+        lfo.output.connect(osc.frequency);
+        osc.output.connect(fft.input);
+        fft.output.connect(ifft1.input);
+        fft.output.connect(ifft2.input);
+        ifft1.output.connect(0, lineOut.input, 0);
+        ifft2.output.connect(0, lineOut.input, 1);
+
+        // Set the frequency and amplitude for the modulated sine wave.
+        center.input.set(600.0);
+        lfo.frequency.set(0.2);
+        lfo.amplitude.set(400.0);
+        osc.amplitude.set(0.6);
+
+        // We only need to start the LineOut. It will pull data through the
+        // chain.
+        lineOut.start();
+
+        System.out.println("You should now be hearing a clean oscillator on the left channel,");
+        System.out.println("and the FFT->IFFT processed signal on the right channel.");
+
+        // Sleep while the sound is generated in the background.
+        try {
+            double time = synth.getCurrentTime();
+            // Sleep for a few seconds.
+            synth.sleepUntil(time + 20.0);
+        } catch (InterruptedException e) {
+            e.printStackTrace();
+        }
+
+        System.out.println("Stop playing. -------------------");
+        // Stop everything.
+        synth.stop();
+    }
+
+    public static void main(String[] args) {
+        new FFTPassthrough().test();
+    }
+}