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diff --git a/tests/com/jsyn/examples/MonoPassThrough.java b/tests/com/jsyn/examples/MonoPassThrough.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.devices.AudioDeviceManager;
+import com.jsyn.unitgen.ChannelIn;
+import com.jsyn.unitgen.ChannelOut;
+
+/**
+ * Pass audio input to audio output.
+ * 
+ * @author Phil Burk (C) 2010 Mobileer Inc
+ */
+public class MonoPassThrough {
+    Synthesizer synth;
+    ChannelIn channelIn;
+    ChannelOut channelOut;
+
+    private void test() {
+        // Create a context for the synthesizer.
+        synth = JSyn.createSynthesizer();
+        synth.add(channelIn = new ChannelIn());
+        synth.add(channelOut = new ChannelOut());
+        // Connect the input to the output.
+        channelIn.output.connect(channelOut.input);
+
+        // Both stereo.
+        int numInputChannels = 2;
+        int numOutputChannels = 2;
+        synth.start(48000, AudioDeviceManager.USE_DEFAULT_DEVICE, numInputChannels,
+                AudioDeviceManager.USE_DEFAULT_DEVICE, numOutputChannels);
+
+        // We only need to start the ChannelOut. It will pull data from the ChannelIn.
+        channelOut.start();
+        // Sleep a while.
+        try {
+            double time = synth.getCurrentTime();
+            // Sleep for a few seconds.
+            synth.sleepUntil(time + 4.0);
+        } catch (InterruptedException e) {
+            e.printStackTrace();
+        }
+        // Stop everything.
+        synth.stop();
+    }
+
+    public static void main(String[] args) {
+        new MonoPassThrough().test();
+    }
+}