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diff --git a/src/com/jsyn/unitgen/MixerMonoRamped.java b/src/com/jsyn/unitgen/MixerMonoRamped.java
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+/*
+ * Copyright 2014 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;
+
+/**
+ * Similar to MixerMono but the gain and amplitude ports are smoothed using short linear ramps. So
+ * you can control them with knobs and not hear any zipper noise.
+ * 
+ * @author Phil Burk (C) 2014 Mobileer Inc
+ */
+public class MixerMonoRamped extends MixerMono {
+    private Unzipper[] unzippers;
+    private Unzipper amplitudeUnzipper;
+
+    public MixerMonoRamped(int numInputs) {
+        super(numInputs);
+        unzippers = new Unzipper[numInputs];
+        for (int i = 0; i < numInputs; i++) {
+            unzippers[i] = new Unzipper();
+        }
+        amplitudeUnzipper = new Unzipper();
+    }
+
+    @Override
+    public void generate(int start, int limit) {
+        double[] amplitudes = amplitude.getValues(0);
+        double[] outputs = output.getValues(0);
+        for (int i = start; i < limit; i++) {
+            double sum = 0;
+            for (int n = 0; n < input.getNumParts(); n++) {
+                double[] inputs = input.getValues(n);
+                double[] gains = gain.getValues(n);
+                double smoothGain = unzippers[n].smooth(gains[i]);
+                sum += inputs[i] * smoothGain;
+            }
+            outputs[i] = sum * amplitudeUnzipper.smooth(amplitudes[i]);
+        }
+    }
+
+}