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diff --git a/src/main/java/com/jsyn/data/SequentialData.java b/src/main/java/com/jsyn/data/SequentialData.java
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+/*
+ * Copyright 2010 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.data;
+
+import com.jsyn.unitgen.FixedRateMonoReader;
+import com.jsyn.unitgen.FixedRateMonoWriter;
+import com.jsyn.unitgen.FixedRateStereoReader;
+import com.jsyn.unitgen.FixedRateStereoWriter;
+import com.jsyn.unitgen.VariableRateMonoReader;
+import com.jsyn.unitgen.VariableRateStereoReader;
+
+/**
+ * Interface for objects that can be read and/or written by index. The index is not stored
+ * internally so they can be shared by multiple readers.
+ *
+ * @author Phil Burk (C) 2010 Mobileer Inc
+ * @see FixedRateMonoReader
+ * @see FixedRateStereoReader
+ * @see FixedRateMonoWriter
+ * @see FixedRateStereoWriter
+ * @see VariableRateMonoReader
+ * @see VariableRateStereoReader
+ */
+public interface SequentialData {
+    /**
+     * Write a value at the given index.
+     *
+     * @param index sample index is ((frameIndex * channelsPerFrame) + channelIndex)
+     * @param value the value to be written
+     */
+    void writeDouble(int index, double value);
+
+    /**
+     * Read a value from the sample independently from the internal storage format.
+     *
+     * @param index sample index is ((frameIndex * channelsPerFrame) + channelIndex)
+     */
+    double readDouble(int index);
+
+    /***
+     * @return Beginning of sustain loop or -1 if no loop.
+     */
+    public int getSustainBegin();
+
+    /**
+     * SustainEnd value is the frame index of the frame just past the end of the loop. The number of
+     * frames included in the loop is (SustainEnd - SustainBegin).
+     *
+     * @return End of sustain loop or -1 if no loop.
+     */
+    public int getSustainEnd();
+
+    /***
+     * @return Beginning of release loop or -1 if no loop.
+     */
+    public int getReleaseBegin();
+
+    /***
+     * @return End of release loop or -1 if no loop.
+     */
+    public int getReleaseEnd();
+
+    /**
+     * Get rate to play the data. In an envelope this correspond to the inverse of the frame
+     * duration and would vary frame to frame. For an audio sample it is 1.0.
+     *
+     * @param index
+     * @param synthesisRate
+     * @return rate to scale the playback speed.
+     */
+    double getRateScaler(int index, double synthesisRate);
+
+    /**
+     * @return For a stereo sample, return 2.
+     */
+    int getChannelsPerFrame();
+
+    /**
+     * @return The number of valid frames that can be read.
+     */
+    int getNumFrames();
+}