     }
 
     /// Sequence on this track
-    public var sequence = NoteEventSequence() { didSet { updateSequence() }}
+    public var sequence = NoteEventSequence() { didSet { updateSequence() } }
 
     /// Remove the notes in the track
     public func clear() {

    }

    private var renderObserverToken: Int?

    private func updateSequence() {
        guard let block = targetNode?.avAudioNode.auAudioUnit.scheduleMIDIEventBlock else {


            guard let auAudioUnit = targetNode?.avAudioNode.auAudioUnit else { return }

            renderObserver = observer
            if renderObserverToken == nil {
                renderObserverToken = auAudioUnit.token(byAddingRenderObserver: observer)
            }
