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diff --git a/src/com/jsyn/util/Instrument.java b/src/com/jsyn/util/Instrument.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.util;
+
+import com.softsynth.shared.time.TimeStamp;
+
+/**
+ * A note player that references one or more voices by a noteNumber. This is similar to the MIDI
+ * protocol that references voices by an integer pitch or keyIndex.
+ * 
+ * @author Phil Burk (C) 2011 Mobileer Inc
+ */
+public interface Instrument {
+    // This will be applied to the voice when noteOn is called.
+    void usePreset(int presetIndex, TimeStamp timeStamp);
+
+    public void noteOn(int tag, double frequency, double amplitude, TimeStamp timeStamp);
+
+    public void noteOff(int tag, TimeStamp timeStamp);
+
+    public void setPort(int tag, String portName, double value, TimeStamp timeStamp);
+
+    public void allNotesOff(TimeStamp timeStamp);
+}