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diff --git a/src/main/java/com/jsyn/unitgen/LineIn.java b/src/main/java/com/jsyn/unitgen/LineIn.java
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+++ b/src/main/java/com/jsyn/unitgen/LineIn.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.Synthesizer;
+import com.jsyn.ports.UnitOutputPort;
+
+/**
+ * External audio input is sent to the output of this unit. The LineIn provides a stereo signal
+ * containing channels 0 and 1. For LineIn to work you must call the Synthesizer start() method with
+ * numInputChannels > 0.
+ *
+ * @author Phil Burk (C) 2009 Mobileer Inc
+ * @see Synthesizer
+ * @see ChannelIn
+ * @see LineOut
+ */
+public class LineIn extends UnitGenerator {
+    public UnitOutputPort output;
+
+    public LineIn() {
+        addPort(output = new UnitOutputPort(2, "Output"));
+    }
+
+    @Override
+    public void generate(int start, int limit) {
+        double[] outputs0 = output.getValues(0);
+        double[] outputs1 = output.getValues(1);
+        double[] buffer0 = synthesisEngine.getInputBuffer(0);
+        double[] buffer1 = synthesisEngine.getInputBuffer(1);
+        for (int i = start; i < limit; i++) {
+            outputs0[i] = buffer0[i];
+            outputs1[i] = buffer1[i];
+        }
+    }
+
+}