diff --git a/libs/ardour/midi_model.cc b/libs/ardour/midi_model.cc
index 168516fcc4..a85d00f49e 100644
--- a/libs/ardour/midi_model.cc
+++ b/libs/ardour/midi_model.cc
@@ -879,8 +879,8 @@ XMLNode& MidiModel::DeltaCommand::get_state()
 
 struct EventTimeComparator {
 	typedef const MIDI::Event* value_type;
-	inline bool operator()(const MIDI::Event* a, const MIDI::Event* b) const {
-		return a->time() >= b->time();
+	inline bool operator()(const MIDI::Event& a, const MIDI::Event& b) const {
+		return a.time() >= b.time();
 	}
 };
 
@@ -893,14 +893,34 @@ struct EventTimeComparator {
  */
 bool MidiModel::write_to(boost::shared_ptr<MidiSource> source)
 {
+	/*
+	EventTimeComparator comp;
+	typedef std::priority_queue<
+				const MIDI::Event*, 
+				std::deque<MIDI::Event>,
+				EventTimeComparator> MidiEvents;
+	
+	MidiEvents events(comp);
+	*/
+	
 	read_lock();
 
 	const NoteMode old_note_mode = _note_mode;
 	_note_mode = Sustained;
 	
 	for (const_iterator i = begin(); i != end(); ++i) {
+		//events.push(*i);
 		source->append_event_unlocked(Frames, *i);
 	}
+	
+	/*
+	// TODO: As of now, this is still necessary, because there are some events appended whose
+	// times are earlier than the preceding events
+	while(!events.empty()) {
+		source->append_event_unlocked(Frames, events.top());
+		events.pop();
+	}
+	*/
 		
 	_note_mode = old_note_mode;
 	
diff --git a/libs/ardour/smf_source.cc b/libs/ardour/smf_source.cc
index 389224eb3b..5ab3a5df13 100644
--- a/libs/ardour/smf_source.cc
+++ b/libs/ardour/smf_source.cc
@@ -507,7 +507,11 @@ SMFSource::append_event_unlocked(EventTimeUnit unit, const MIDI::Event& ev)
 	printf("\n");
 	
 	assert(ev.time() >= 0);
-	assert(ev.time() >= _last_ev_time);
+	
+	if (ev.time() < _last_ev_time) {
+		cerr << "SMFSource: Warning: Skipping event with ev.time() < _last_ev_time" << endl;
+		return;
+	}
 	
 	uint32_t delta_time = 0;