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diff --git a/src/main/java/com/jsyn/unitgen/Latch.java b/src/main/java/com/jsyn/unitgen/Latch.java
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+/*
+ * Copyright 1997 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;
+
+/**
+ * Latch or hold an input value.
+ * <p>
+ * Pass a value unchanged if gate true, otherwise output held value.
+ * <p>
+ * output = ( gate &gt; 0.0 ) ? input : previous_output;
+ *
+ * @author (C) 1997-2010 Phil Burk, Mobileer Inc
+ * @see EdgeDetector
+ */
+public class Latch extends UnitFilter {
+    public UnitInputPort gate;
+    private double held;
+
+    /* Define Unit Ports used by connect() and set(). */
+    public Latch() {
+        addPort(gate = new UnitInputPort("Gate"));
+    }
+
+    @Override
+    public void generate(int start, int limit) {
+        double[] inputs = input.getValues();
+        double[] gates = gate.getValues();
+        double[] outputs = output.getValues();
+
+        for (int i = start; i < limit; i++) {
+            if (gates[i] > 0.0) {
+                held = inputs[i];
+            }
+            outputs[i] = held;
+        }
+    }
+}