diff --git a/Examples/ChaosHarmonizer/ChaosHarmonizer/Base.lproj/Main.storyboard b/Examples/ChaosHarmonizer/ChaosHarmonizer/Base.lproj/Main.storyboard
index c51a259..a132494 100644
--- a/Examples/ChaosHarmonizer/ChaosHarmonizer/Base.lproj/Main.storyboard
+++ b/Examples/ChaosHarmonizer/ChaosHarmonizer/Base.lproj/Main.storyboard
@@ -1,7 +1,7 @@
 <?xml version="1.0" encoding="UTF-8" standalone="no"?>
-<document type="com.apple.InterfaceBuilder3.Cocoa.Storyboard.XIB" version="3.0" toolsVersion="6198" systemVersion="14A297b" targetRuntime="MacOSX.Cocoa" propertyAccessControl="none" useAutolayout="YES" initialViewController="B8D-0N-5wS">
+<document type="com.apple.InterfaceBuilder3.Cocoa.Storyboard.XIB" version="3.0" toolsVersion="7702" systemVersion="14D136" targetRuntime="MacOSX.Cocoa" propertyAccessControl="none" useAutolayout="YES" initialViewController="B8D-0N-5wS">
     <dependencies>
-        <plugIn identifier="com.apple.InterfaceBuilder.CocoaPlugin" version="6198"/>
+        <plugIn identifier="com.apple.InterfaceBuilder.CocoaPlugin" version="7702"/>
     </dependencies>
     <scenes>
         <!--Application-->
@@ -148,8 +148,7 @@
                                                 <action selector="paste:" target="Ady-hI-5gd" id="UvS-8e-Qdg"/>
                                             </connections>
                                         </menuItem>
-                                        <menuItem title="Paste and Match Style" keyEquivalent="V" id="WeT-3V-zwk">
-                                            <modifierMask key="keyEquivalentModifierMask" option="YES" command="YES"/>
+                                        <menuItem title="Paste and Match Style" keyEquivalent="v" id="WeT-3V-zwk">
                                             <connections>
                                                 <action selector="pasteAsPlainText:" target="Ady-hI-5gd" id="cEh-KX-wJQ"/>
                                             </connections>
@@ -641,16 +640,16 @@
                         <outlet property="delegate" destination="Voe-Tx-rLC" id="PrD-fu-P6m"/>
                     </connections>
                 </application>
-                <customObject id="Voe-Tx-rLC" customClass="AppDelegate" customModuleProvider="target"/>
+                <customObject id="Voe-Tx-rLC" customClass="AppDelegate" customModule="ChaosHarmonizer" customModuleProvider="target"/>
                 <customObject id="Ady-hI-5gd" userLabel="First Responder" customClass="NSResponder" sceneMemberID="firstResponder"/>
             </objects>
             <point key="canvasLocation" x="75" y="0.0"/>
         </scene>
-        <!--Window Controller - Window-->
+        <!--Window Controller-->
         <scene sceneID="R2V-B0-nI4">
             <objects>
                 <windowController id="B8D-0N-5wS" sceneMemberID="viewController">
-                    <window key="window" title="Window" allowsToolTipsWhenApplicationIsInactive="NO" autorecalculatesKeyViewLoop="NO" oneShot="NO" releasedWhenClosed="NO" showsToolbarButton="NO" visibleAtLaunch="NO" animationBehavior="default" id="IQv-IB-iLA">
+                    <window key="window" title="ChaosHarmonizer" allowsToolTipsWhenApplicationIsInactive="NO" autorecalculatesKeyViewLoop="NO" oneShot="NO" releasedWhenClosed="NO" showsToolbarButton="NO" visibleAtLaunch="NO" animationBehavior="default" id="IQv-IB-iLA">
                         <windowStyleMask key="styleMask" titled="YES" closable="YES" miniaturizable="YES" resizable="YES"/>
                         <windowPositionMask key="initialPositionMask" leftStrut="YES" rightStrut="YES" topStrut="YES" bottomStrut="YES"/>
                         <rect key="contentRect" x="196" y="240" width="480" height="270"/>
@@ -667,7 +666,7 @@
         <!--View Controller-->
         <scene sceneID="hIz-AP-VOD">
             <objects>
-                <viewController id="XfG-lQ-9wD" customClass="ViewController" customModuleProvider="target" sceneMemberID="viewController">
+                <viewController id="XfG-lQ-9wD" customClass="ViewController" customModule="ChaosHarmonizer" customModuleProvider="target" sceneMemberID="viewController">
                     <view key="view" id="m2S-Jp-Qdl">
                         <rect key="frame" x="0.0" y="0.0" width="480" height="270"/>
                         <autoresizingMask key="autoresizingMask"/>
diff --git a/Examples/ChaosHarmonizer/ChaosHarmonizer/ViewController.swift b/Examples/ChaosHarmonizer/ChaosHarmonizer/ViewController.swift
index 1dbc85f..13faed8 100644
--- a/Examples/ChaosHarmonizer/ChaosHarmonizer/ViewController.swift
+++ b/Examples/ChaosHarmonizer/ChaosHarmonizer/ViewController.swift
@@ -5,19 +5,47 @@ import MusicKit
 
 class ViewController: NSViewController {
 
+    var noteNumberToPitchSet = [UInt : PitchSet]()
+
     override func viewDidLoad() {
         super.viewDidLoad()
+
         let midi = MIDI(name: "ChaosHarmonizer")
         midi.noteHandler = { messages in
             if let first = messages.first {
-                let possibleChords = ChordQuality.Hexads
-                let index = arc4random_uniform(UInt32(possibleChords.count))
-                let quality = possibleChords[Int(index)]
-                let intervals = quality.intervals
-                let indices = MKUtil.semitoneIndices(intervals)
-                let semitones = indices[indices.count - 1]
-                let harmonizer = Harmony.transpose(Harmony.create(intervals), semitones: semitones)
-                midi.send([first, first.transpose(2), first.transpose(3)])
+                if first.on {
+                    let possibleChords = [
+                        ChordQuality.Major,
+                        ChordQuality.Sus2,
+                        ChordQuality.Sus4,
+                        ChordQuality.Minor,
+                    ]
+                    let index = arc4random_uniform(UInt32(possibleChords.count))
+                    let quality = possibleChords[Int(index)]
+                    let intervals = quality.intervals
+                    let indices = MKUtil.semitoneIndices(intervals)
+                    let transposition = indices[indices.count - 1]*(-2)
+                    let harmonizer = Harmony.transpose(Harmony.create(intervals), semitones: transposition)
+                    let pitch = Pitch(midi: Float(first.noteNumber))
+                    var pitchSet = harmonizer(pitch)
+                    self.noteNumberToPitchSet[first.noteNumber] = pitchSet
+                    var messages = first.harmonize(harmonizer)
+                    messages.append(first)
+                    midi.send(messages)
+                }
+                else {
+                    var offMessages = [MIDINoteMessage]()
+                    if let pitchSet = self.noteNumberToPitchSet[first.noteNumber] {
+                        for pitch in pitchSet {
+                            let message = MIDINoteMessage(on: false,
+                                channel: first.channel,
+                                noteNumber: UInt(pitch.midi), velocity: 0)
+                            offMessages.append(message)
+                            offMessages.append(first)
+                        }
+                        midi.send(offMessages)
+                    }
+                }
             }
         }
     }
diff --git a/MusicKit/MIDI.swift b/MusicKit/MIDI.swift
index 8aad17a..a047fea 100644
--- a/MusicKit/MIDI.swift
+++ b/MusicKit/MIDI.swift
@@ -50,7 +50,7 @@ public class MIDI {
     /// Note that messages are always sent on `sourceChannel`.
     ///
     /// :returns: `true` if the message was successfully sent
-    public func send(messages: [MIDIMessage]) -> Bool {
+    public func send<T: MIDIMessage>(messages: [T]) -> Bool {
         var success = false
         var packet = UnsafeMutablePointer<MIDIPacket>.alloc(sizeof(MIDIPacket))
         var packetList = UnsafeMutablePointer<MIDIPacketList>.alloc(sizeof(MIDIPacketList))
diff --git a/MusicKit/MIDIMessage.swift b/MusicKit/MIDIMessage.swift
index 9f12fd3..d8c8f97 100644
--- a/MusicKit/MIDIMessage.swift
+++ b/MusicKit/MIDIMessage.swift
@@ -36,6 +36,23 @@ public struct MIDINoteMessage : MIDIMessage {
     public func copyOnChannel(channel: UInt) -> MIDINoteMessage {
         return MIDINoteMessage(on: on, channel: channel, noteNumber: noteNumber, velocity: velocity)
     }
+
+    /// The message's pitch
+    public var pitch : Pitch {
+        return Pitch(midi: Float(noteNumber))
+    }
+
+    /// Applies the given `Harmonizer` to the message.
+    public func harmonize(harmonizer: Harmonizer) -> [MIDINoteMessage] {
+        let ps = harmonizer(pitch)
+        var messages = [MIDINoteMessage]()
+        // TODO: add a PitchSet -> Array method so this can be mapped
+        for p in ps {
+            messages.append(MIDINoteMessage(on: self.on, channel: self.channel,
+                noteNumber: UInt(p.midi), velocity: self.velocity))
+        }
+        return messages
+    }
 }
 
 extension MIDINoteMessage : Printable {