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diff --git a/src/com/jsyn/unitgen/GrainSourceSine.java b/src/com/jsyn/unitgen/GrainSourceSine.java
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+++ b/src/com/jsyn/unitgen/GrainSourceSine.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.unitgen;
+
+/**
+ * A simple sine wave generator for a Grain. This uses the same fast Taylor expansion that the
+ * SineOscillator uses.
+ * 
+ * @author Phil Burk (C) 2011 Mobileer Inc
+ */
+public class GrainSourceSine extends GrainCommon implements GrainSource {
+    protected double phase;
+    protected double phaseIncrement;
+
+    public GrainSourceSine() {
+        setRate(1.0);
+    }
+
+    public void setPhaseIncrement(double phaseIncrement) {
+        this.phaseIncrement = phaseIncrement;
+    }
+
+    @Override
+    public double next() {
+        phase += phaseIncrement;
+        if (phase > 1.0) {
+            phase -= 2.0;
+        }
+        return SineOscillator.fastSin(phase);
+    }
+
+    @Override
+    public void setRate(double rate) {
+        setPhaseIncrement(rate * 0.1 / Math.PI);
+    }
+
+}