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diff --git a/src/com/jsyn/unitgen/SampleGrainFarm.java b/src/com/jsyn/unitgen/SampleGrainFarm.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;
+
+import com.jsyn.data.FloatSample;
+import com.jsyn.ports.UnitInputPort;
+
+/**
+ * A GrainFarm that uses a FloatSample as source material. In this example we load a FloatSample for
+ * use as a source material. <code><pre>
+	synth.add( sampleGrainFarm = new SampleGrainFarm() );
+	// Load a sample that we want to "granulate" from a file.
+	sample = SampleLoader.loadFloatSample( sampleFile );
+	sampleGrainFarm.setSample( sample );
+	// Use a ramp to move smoothly within the file.
+	synth.add( ramp = new ContinuousRamp() );
+	ramp.output.connect( sampleGrainFarm.position );
+</pre><code>
+ * 
+ * @author Phil Burk (C) 2011 Mobileer Inc
+ */
+public class SampleGrainFarm extends GrainFarm {
+    private FloatSample sample;
+    public UnitInputPort position;
+    public UnitInputPort positionRange;
+
+    public SampleGrainFarm() {
+        super();
+        addPort(position = new UnitInputPort("Position", 0.0));
+        addPort(positionRange = new UnitInputPort("PositionRange", 0.0));
+    }
+
+    @Override
+    public void allocate(int numGrains) {
+        Grain[] grainArray = new Grain[numGrains];
+        for (int i = 0; i < numGrains; i++) {
+            Grain grain = new Grain(new SampleGrainSource(), new RaisedCosineEnvelope());
+            grainArray[i] = grain;
+        }
+        setGrainArray(grainArray);
+    }
+
+    @Override
+    public void setupGrain(Grain grain, int i) {
+        SampleGrainSource sampleGrainSource = (SampleGrainSource) grain.getSource();
+        sampleGrainSource.setSample(sample);
+        sampleGrainSource.setPosition(position.getValues()[i]);
+        sampleGrainSource.setPositionRange(positionRange.getValues()[i]);
+        super.setupGrain(grain, i);
+    }
+
+    public void setSample(FloatSample sample) {
+        this.sample = sample;
+    }
+}