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diff --git a/src/com/jsyn/util/PolyphonicInstrument.java b/src/com/jsyn/util/PolyphonicInstrument.java
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+/*
+ * Copyright 2011 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.util;
+
+import com.jsyn.ports.UnitInputPort;
+import com.jsyn.ports.UnitOutputPort;
+import com.jsyn.ports.UnitPort;
+import com.jsyn.unitgen.Circuit;
+import com.jsyn.unitgen.Multiply;
+import com.jsyn.unitgen.PassThrough;
+import com.jsyn.unitgen.UnitGenerator;
+import com.jsyn.unitgen.UnitSource;
+import com.jsyn.unitgen.UnitVoice;
+import com.softsynth.shared.time.TimeStamp;
+
+/**
+ * The API for this class is likely to change. Please comment on its usefulness.
+ * 
+ * @author Phil Burk (C) 2011 Mobileer Inc
+ */
+
+public class PolyphonicInstrument extends Circuit implements UnitSource, Instrument {
+    private Multiply mixer;
+    private UnitVoice[] voices;
+    private VoiceAllocator voiceAllocator;
+    public UnitInputPort amplitude;
+
+    public PolyphonicInstrument(UnitVoice[] voices) {
+        this.voices = voices;
+        voiceAllocator = new VoiceAllocator(voices);
+        add(mixer = new Multiply());
+        // Mix all the voices to one output.
+        for (UnitVoice voice : voices) {
+            UnitGenerator unit = voice.getUnitGenerator();
+            boolean wasEnabled = unit.isEnabled();
+            // This overrides the enabled property of the voice.
+            add(unit);
+            voice.getOutput().connect(mixer.inputA);
+            // restore
+            unit.setEnabled(wasEnabled);
+        }
+
+        addPort(amplitude = mixer.inputB, "Amplitude");
+        amplitude.setup(0.0001, 0.4, 2.0);
+    }
+
+    /**
+     * Connect a PassThrough unit to the input ports of the voices so that they can be controlled
+     * together using a single port. Note that this will prevent their individual use. So the
+     * "Frequency" and "Amplitude" ports are excluded. Note that this method is a bit funky and is
+     * likely to change.
+     */
+    public void exportAllInputPorts() {
+        // Iterate through the ports.
+        for (UnitPort port : voices[0].getUnitGenerator().getPorts()) {
+            if (port instanceof UnitInputPort) {
+                UnitInputPort inputPort = (UnitInputPort) port;
+                String voicePortName = inputPort.getName();
+                // FIXME Need better way to identify ports that are per note.
+                if (!voicePortName.equals("Frequency") && !voicePortName.equals("Amplitude")) {
+                    exportNamedInputPort(voicePortName);
+                }
+            }
+        }
+    }
+
+    /**
+     * Create a UnitInputPort for the circuit that is connected to the named port on each voice
+     * through a PassThrough unit. This allows you to control all of the voices at once.
+     * 
+     * @param portName
+     * @see exportAllInputPorts
+     */
+    public void exportNamedInputPort(String portName) {
+        UnitInputPort voicePort = null;
+        PassThrough fanout = new PassThrough();
+        for (UnitVoice voice : voices) {
+            voicePort = (UnitInputPort) voice.getUnitGenerator().getPortByName(portName);
+            fanout.output.connect(voicePort);
+        }
+        if (voicePort != null) {
+            addPort(fanout.input, portName);
+            fanout.input.setup(voicePort);
+        }
+    }
+
+    @Override
+    public UnitOutputPort getOutput() {
+        return mixer.output;
+    }
+
+    // FIXME - no timestamp on UnitVoice
+    @Override
+    public void usePreset(int presetIndex) {
+        usePreset(presetIndex, getSynthesisEngine().createTimeStamp());
+    }
+
+    // FIXME - no timestamp on UnitVoice
+    @Override
+    public void usePreset(int presetIndex, TimeStamp timeStamp) {
+        // Apply preset to all voices.
+        for (UnitVoice voice : voices) {
+            voice.usePreset(presetIndex);
+        }
+        // Then copy values from first voice to instrument.
+        for (UnitPort port : voices[0].getUnitGenerator().getPorts()) {
+            if (port instanceof UnitInputPort) {
+                UnitInputPort inputPort = (UnitInputPort) port;
+                // FIXME Need better way to identify ports that are per note.
+                UnitInputPort fanPort = (UnitInputPort) getPortByName(inputPort.getName());
+                if ((fanPort != null) && (fanPort != amplitude)) {
+                    fanPort.set(inputPort.get());
+                }
+            }
+        }
+    }
+
+    @Override
+    public void noteOn(int tag, double frequency, double amplitude, TimeStamp timeStamp) {
+        voiceAllocator.noteOn(tag, frequency, amplitude, timeStamp);
+    }
+
+    @Override
+    public void noteOff(int tag, TimeStamp timeStamp) {
+        voiceAllocator.noteOff(tag, timeStamp);
+    }
+
+    @Override
+    public void setPort(int tag, String portName, double value, TimeStamp timeStamp) {
+        voiceAllocator.setPort(tag, portName, value, timeStamp);
+    }
+
+    @Override
+    public void allNotesOff(TimeStamp timeStamp) {
+        voiceAllocator.allNotesOff(timeStamp);
+    }
+
+    public synchronized boolean isOn(int tag) {
+        return voiceAllocator.isOn(tag);
+    }
+}