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diff --git a/tests/com/jsyn/ports/TestSequentialData.java b/tests/com/jsyn/ports/TestSequentialData.java
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+++ b/tests/com/jsyn/ports/TestSequentialData.java
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+/*
+ * Copyright 2009 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.ports;
+
+import junit.framework.TestCase;
+
+import com.jsyn.data.FloatSample;
+
+public class TestSequentialData extends TestCase {
+
+    float[] data1 = {
+            0.0f, 1.0f, 2.0f, 3.0f, 4.0f, 5.0f, 6.0f, 7.0f, 8.0f, 9.0f
+    };
+    FloatSample sample1;
+    float[] data2 = {
+            20.0f, 19.0f, 18.0f, 17.0f, 16.0f, 15.0f, 14.0f, 13.0f, 12.0f, 11.0f
+    };
+    FloatSample sample2;
+
+    public void testCrossfade() {
+        sample1 = new FloatSample(data1);
+        sample2 = new FloatSample(data2);
+        SequentialDataCrossfade xfade = new SequentialDataCrossfade();
+        xfade.setup(sample1, 4, 3, sample2, 1, 6);
+
+        for (int i = 0; i < 3; i++) {
+            double factor = i / 3.0;
+            double value = ((1.0 - factor) * data1[i + 4]) + (factor * data2[i + 1]);
+            System.out.println("i = " + i + ", factor = " + factor + ", value = " + value);
+            assertEquals("crossfade " + i, value, xfade.readDouble(i), 0.00001);
+        }
+        for (int i = 3; i < 6; i++) {
+            assertEquals("crossfade " + i, sample2.readDouble(i + 1), xfade.readDouble(i), 0.00001);
+        }
+    }
+}