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diff --git a/src/com/jsyn/unitgen/UnitGenerator.java b/src/com/jsyn/unitgen/UnitGenerator.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 java.io.PrintStream;
+import java.util.Collection;
+import java.util.LinkedHashMap;
+import java.util.logging.Logger;
+
+import com.jsyn.Synthesizer;
+import com.jsyn.engine.SynthesisEngine;
+import com.jsyn.ports.ConnectableInput;
+import com.jsyn.ports.UnitInputPort;
+import com.jsyn.ports.UnitOutputPort;
+import com.jsyn.ports.UnitPort;
+import com.softsynth.shared.time.TimeStamp;
+
+/**
+ * Base class for all unit generators.
+ * 
+ * @author Phil Burk (C) 2009 Mobileer Inc
+ */
+public abstract class UnitGenerator {
+    protected static final double VERY_SMALL_FLOAT = 1.0e-26;
+    public static final double FALSE = 0.0;
+    public static final double TRUE = 1.0;
+    protected SynthesisEngine synthesisEngine;
+    private LinkedHashMap<String, UnitPort> ports = new LinkedHashMap<String, UnitPort>();
+    private Circuit circuit;
+    private long lastFrameCount;
+    private boolean enabled = true;
+    private static int nextId;
+    private int id = nextId++;
+    private int frameRate;
+    private double framePeriod;
+
+    static Logger logger = Logger.getLogger(UnitGenerator.class.getName());
+
+    public int getId() {
+        return id;
+    }
+
+    public int getFrameRate() {
+        // return frameRate;
+        return synthesisEngine.getFrameRate();
+    }
+
+    public double getFramePeriod() {
+        // return framePeriod; // TODO - Why does OldJSynTestSuite fail if I use this!
+        return synthesisEngine.getFramePeriod();
+    }
+
+    public void addPort(UnitPort port) {
+        port.setUnitGenerator(this);
+        // Store in a hash table by name.
+        ports.put(port.getName().toLowerCase(), port);
+    }
+
+    public void addPort(UnitPort port, String name) {
+        port.setName(name);
+        addPort(port);
+    }
+
+    public UnitPort getPortByName(String portName) {
+        return ports.get(portName.toLowerCase());
+    }
+
+    public Collection<UnitPort> getPorts() {
+        return ports.values();
+    }
+
+    /**
+     * Perform essential synthesis function.
+     * 
+     * @param start offset into port buffers
+     * @param limit limit offset into port buffers for loop
+     */
+    public abstract void generate(int start, int limit);
+
+    /**
+     * Generate a full block.
+     */
+    public void generate() {
+        generate(0, Synthesizer.FRAMES_PER_BLOCK);
+    }
+
+    /**
+     * @return the synthesisEngine
+     */
+    public SynthesisEngine getSynthesisEngine() {
+        return synthesisEngine;
+    }
+
+    /**
+     * @return the Synthesizer
+     */
+    public Synthesizer getSynthesizer() {
+        return synthesisEngine;
+    }
+
+    /**
+     * @param synthesisEngine the synthesisEngine to set
+     */
+    public void setSynthesisEngine(SynthesisEngine synthesisEngine) {
+        if ((this.synthesisEngine != null) && (this.synthesisEngine != synthesisEngine)) {
+            throw new RuntimeException("Unit synthesisEngine already set.");
+        }
+        this.synthesisEngine = synthesisEngine;
+    }
+
+    public UnitGenerator getTopUnit() {
+        UnitGenerator unit = this;
+        // Climb to top of circuit hierarchy.
+        while (unit.circuit != null) {
+            unit = unit.circuit;
+        }
+        logger.fine("getTopUnit " + this + " => " + unit);
+        return unit;
+    }
+
+    protected void autoStop() {
+        synthesisEngine.autoStopUnit(getTopUnit());
+    }
+
+    /** Calculate signal based on halflife of an exponential decay. */
+    public double convertHalfLifeToMultiplier(double halfLife) {
+        if (halfLife < (2.0 * getFramePeriod())) {
+            return 1.0;
+        } else {
+            // Strangely enough, this code is valid for both PeakFollower
+            // and AsymptoticRamp.
+            return 1.0 - Math.pow(0.5, 1.0 / (halfLife * getSynthesisEngine().getFrameRate()));
+        }
+    }
+
+    protected double incrementWrapPhase(double currentPhase, double phaseIncrement) {
+        currentPhase += phaseIncrement;
+
+        if (currentPhase >= 1.0)
+            currentPhase -= 2.0;
+        else if (currentPhase < -1.0)
+            currentPhase += 2.0;
+        return currentPhase;
+    }
+
+    /** Calculate rate based on phase going from 0.0 to 1.0 in time. */
+    protected double convertTimeToRate(double time) {
+        double period2X = synthesisEngine.getInverseNyquist();
+        if (time < period2X) {
+            return 1.0;
+        } else {
+            return getFramePeriod() / time;
+        }
+    }
+
+    /** Flatten output ports so we don't output a changing signal when stopped. */
+    public void flattenOutputs() {
+        for (UnitPort port : ports.values()) {
+            if (port instanceof UnitOutputPort) {
+                ((UnitOutputPort) port).flatten();
+            }
+        }
+    }
+
+    public void setCircuit(Circuit circuit) {
+        if ((this.circuit != null) && (circuit != null)) {
+            throw new RuntimeException("Unit is already in a circuit.");
+        }
+        // logger.info( "setCircuit in  unit " + this + " with circuit " + circuit );
+        this.circuit = circuit;
+    }
+
+    public Circuit getCircuit() {
+        return circuit;
+    }
+
+    public void pullData(long frameCount, int start, int limit) {
+        // Don't generate twice in case the paths merge.
+        if (enabled && (frameCount > lastFrameCount)) {
+            // Do this first to block recursion when there is a feedback loop.
+            lastFrameCount = frameCount;
+            // Then pull from all the units that are upstream.
+            for (UnitPort port : ports.values()) {
+                if (port instanceof ConnectableInput) {
+                    ((ConnectableInput) port).pullData(frameCount, start, limit);
+                }
+            }
+            // Finally generate using outputs of the upstream units.
+            generate(start, limit);
+        }
+    }
+
+    public boolean isEnabled() {
+        return enabled;
+    }
+
+    /**
+     * If enabled, then a unit will execute if its output is connected to another unit that is
+     * executed. If not enabled then it will not execute and will not pull data from units that are
+     * connected to its inputs. Disabling a unit at the output of a tree of units can be used to
+     * turn off the entire tree, thus saving CPU cycles.
+     * 
+     * @param enabled
+     * @see UnitGate.setupAutoDisabled
+     * @see start
+     */
+    public void setEnabled(boolean enabled) {
+        this.enabled = enabled;
+        if (!enabled) {
+            flattenOutputs();
+        }
+    }
+
+    /**
+     * Start executing this unit directly by adding it to a "run list" of units in the synthesis
+     * engine. This method is normally only called for the final unit in a chain, for example a
+     * LineOut. When that final unit executes it will "pull" data from any units connected to its
+     * inputs. Those units will then pull data their inputs until the entire chain is executed. If
+     * units are connected in a circle then this will be detected and the infinite recursion will be
+     * blocked.
+     * 
+     * @see setEnabled
+     */
+    public void start() {
+        if (getSynthesisEngine() == null) {
+            throw new RuntimeException("This " + this.getClass().getName()
+                    + " was not add()ed to a Synthesizer.");
+        }
+        getSynthesisEngine().startUnit(this);
+    }
+
+    /**
+     * Start a unit at the specified time.
+     * 
+     * @param time
+     * @see start
+     */
+    public void start(double time) {
+        start(new TimeStamp(time));
+    }
+
+    /**
+     * Start a unit at the specified time.
+     * 
+     * @param timeStamp
+     * @see start
+     */
+    public void start(TimeStamp timeStamp) {
+        if (getSynthesisEngine() == null) {
+            throw new RuntimeException("This " + this.getClass().getName()
+                    + " was not add()ed to a Synthesizer.");
+        }
+        getSynthesisEngine().startUnit(this, timeStamp);
+    }
+
+    /**
+     * Stop a unit at the specified time.
+     * 
+     * @param time
+     * @see start
+     */
+    public void stop(double time) {
+        stop(new TimeStamp(time));
+    }
+
+    public void stop() {
+        getSynthesisEngine().stopUnit(this);
+    }
+
+    public void stop(TimeStamp timeStamp) {
+        getSynthesisEngine().stopUnit(this, timeStamp);
+    }
+
+    public void setFrameRate(int rate) {
+        this.frameRate = rate;
+        this.framePeriod = 1.0 / rate;
+    }
+
+    /** Needed by UnitSink */
+    public UnitGenerator getUnitGenerator() {
+        return this;
+    }
+
+    /** Needed by UnitVoice */
+    public void setPort(String portName, double value, TimeStamp timeStamp) {
+        UnitInputPort port = (UnitInputPort) getPortByName(portName);
+        // System.out.println("setPort " + port );
+        if (port == null) {
+            logger.warning("port was null for name " + portName + ", " + this.getClass().getName());
+        } else {
+            port.set(value, timeStamp);
+        }
+    }
+
+    public void printConnections() {
+        printConnections(System.out);
+    }
+
+    public void printConnections(PrintStream out) {
+        printConnections(out, 0);
+    }
+
+    public void printConnections(PrintStream out, int level) {
+        for (UnitPort port : getPorts()) {
+            if (port instanceof UnitInputPort) {
+                ((UnitInputPort) port).printConnections(out, level);
+            }
+        }
+    }
+
+}