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diff --git a/src/com/jsyn/instruments/DrumWoodFM.java b/src/com/jsyn/instruments/DrumWoodFM.java
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+++ b/src/com/jsyn/instruments/DrumWoodFM.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.instruments;
+
+import com.jsyn.ports.UnitInputPort;
+import com.jsyn.ports.UnitOutputPort;
+import com.jsyn.unitgen.Add;
+import com.jsyn.unitgen.Circuit;
+import com.jsyn.unitgen.EnvelopeAttackDecay;
+import com.jsyn.unitgen.Multiply;
+import com.jsyn.unitgen.PassThrough;
+import com.jsyn.unitgen.SineOscillator;
+import com.jsyn.unitgen.SineOscillatorPhaseModulated;
+import com.jsyn.unitgen.UnitVoice;
+import com.jsyn.util.VoiceDescription;
+import com.softsynth.shared.time.TimeStamp;
+
+/**
+ * Drum instruments using 2 Operator FM.
+ * 
+ * @author Phil Burk (C) 2011 Mobileer Inc
+ */
+public class DrumWoodFM extends Circuit implements UnitVoice {
+    private static final int NUM_PRESETS = 3;
+    // Declare units and ports.
+    EnvelopeAttackDecay ampEnv;
+    SineOscillatorPhaseModulated carrierOsc;
+    EnvelopeAttackDecay modEnv;
+    SineOscillator modOsc;
+    PassThrough freqDistributor;
+    Add modSummer;
+    Multiply frequencyMultiplier;
+
+    public UnitInputPort mcratio;
+    public UnitInputPort index;
+    public UnitInputPort modRange;
+    public UnitInputPort frequency;
+
+    public DrumWoodFM() {
+        // Create unit generators.
+        add(carrierOsc = new SineOscillatorPhaseModulated());
+        add(freqDistributor = new PassThrough());
+        add(modSummer = new Add());
+        add(ampEnv = new EnvelopeAttackDecay());
+        add(modEnv = new EnvelopeAttackDecay());
+        add(modOsc = new SineOscillator());
+        add(frequencyMultiplier = new Multiply());
+
+        addPort(mcratio = frequencyMultiplier.inputB, "MCRatio");
+        addPort(index = modSummer.inputA, "Index");
+        addPort(modRange = modEnv.amplitude, "ModRange");
+        addPort(frequency = freqDistributor.input, "Frequency");
+
+        ampEnv.export(this, "Amp");
+        modEnv.export(this, "Mod");
+
+        freqDistributor.output.connect(carrierOsc.frequency);
+        freqDistributor.output.connect(frequencyMultiplier.inputA);
+
+        carrierOsc.output.connect(ampEnv.amplitude);
+        modEnv.output.connect(modSummer.inputB);
+        modSummer.output.connect(modOsc.amplitude);
+        modOsc.output.connect(carrierOsc.modulation);
+        frequencyMultiplier.output.connect(modOsc.frequency);
+
+        // Make the circuit turn off when the envelope finishes to reduce CPU load.
+        ampEnv.setupAutoDisable(this);
+
+        usePreset(0);
+    }
+
+    @Override
+    public void noteOff(TimeStamp timeStamp) {
+    }
+
+    @Override
+    public void noteOn(double freq, double ampl, TimeStamp timeStamp) {
+        carrierOsc.amplitude.set(ampl, timeStamp);
+        ampEnv.input.trigger(timeStamp);
+        modEnv.input.trigger(timeStamp);
+    }
+
+    @Override
+    public UnitOutputPort getOutput() {
+        return ampEnv.output;
+    }
+
+    @Override
+    public void usePreset(int presetIndex) {
+        mcratio.setup(0.001, 0.6875, 20.0);
+        ampEnv.attack.setup(0.001, 0.005, 8.0);
+        modEnv.attack.setup(0.001, 0.005, 8.0);
+
+        int n = presetIndex % NUM_PRESETS;
+        switch (n) {
+            case 0:
+                ampEnv.decay.setup(0.001, 0.293, 8.0);
+                modEnv.decay.setup(0.001, 0.07, 8.0);
+                frequency.setup(0.0, 349.0, 3000.0);
+                index.setup(0.001, 0.05, 10.0);
+                modRange.setup(0.001, 0.4, 10.0);
+                break;
+            case 1:
+            default:
+                ampEnv.decay.setup(0.001, 0.12, 8.0);
+                modEnv.decay.setup(0.001, 0.06, 8.0);
+                frequency.setup(0.0, 1400.0, 3000.0);
+                index.setup(0.001, 0.16, 10.0);
+                modRange.setup(0.001, 0.17, 10.0);
+                break;
+        }
+    }
+
+    static class MyVoiceDescription extends VoiceDescription {
+        static String[] presetNames = {
+                "WoodBlockFM", "ClaveFM"
+        };
+        static String[] tags = {
+                "electronic", "drum"
+        };
+
+        public MyVoiceDescription() {
+            super("DrumWoodFM", presetNames);
+        }
+
+        @Override
+        public UnitVoice createUnitVoice() {
+            return new DrumWoodFM();
+        }
+
+        @Override
+        public String[] getTags(int presetIndex) {
+            return tags;
+        }
+
+        @Override
+        public String getVoiceClassName() {
+            return DrumWoodFM.class.getName();
+        }
+    }
+
+    public static VoiceDescription getVoiceDescription() {
+        return new MyVoiceDescription();
+    }
+}