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diff --git a/tests/com/jsyn/unitgen/EnablingGate.java b/tests/com/jsyn/unitgen/EnablingGate.java
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+++ b/tests/com/jsyn/unitgen/EnablingGate.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.unitgen;
+
+import com.jsyn.ports.UnitInputPort;
+
+/**
+ * This can be used to block the execution of upstream units. It can be placed at the output of a
+ * circuit and driven with an amplitude envelope.
+ * 
+ * @author Phil Burk (C) 2010 Mobileer Inc
+ */
+public class EnablingGate extends UnitFilter {
+    public UnitInputPort gate;
+
+    /* Define Unit Ports used by connect() and set(). */
+    public EnablingGate() {
+        super();
+        addPort(gate = new UnitInputPort("Gate"));
+    }
+
+    @Override
+    public void generate(int start, int limit) {
+        double[] aValues = input.getValues();
+        double[] bValues = gate.getValues();
+        double[] outputs = output.getValues();
+        for (int i = start; i < limit; i++) {
+            outputs[i] = aValues[i] * bValues[i];
+        }
+        // If we end up at zero then disable pulling of data.
+        // We do this at the end so that envelope can get started.
+        if (outputs[limit - 1] <= 0.0) {
+            setEnabled(false);
+        }
+    }
+
+}