diff --git a/libs/ardour/smf_source.cc b/libs/ardour/smf_source.cc
index 64bd687418..cdf252c8cf 100644
--- a/libs/ardour/smf_source.cc
+++ b/libs/ardour/smf_source.cc
@@ -303,7 +303,7 @@ SMFSource::append_event_unlocked(EventTimeUnit unit, const Evoral::Event<double>
 		delta_time = (uint32_t)((ev.time() - last_event_time()) * ppqn());
 	}
 
-	Evoral::SMF<double>::append_event_delta(delta_time, ev);
+	Evoral::SMF<double>::append_event_delta(delta_time, ev.size(), ev.buffer());
 	_last_ev_time = ev.time();
 
 	_write_data_count += ev.size();
@@ -619,7 +619,6 @@ SMFSource::load_model(bool lock, bool force_reload)
 		return;
 	}
 	
-
 	if (lock) {
 		Glib::Mutex::Lock lm (_lock);
 	}
diff --git a/libs/evoral/evoral/SMF.hpp b/libs/evoral/evoral/SMF.hpp
index cdf3170d52..14046ab8f3 100644
--- a/libs/evoral/evoral/SMF.hpp
+++ b/libs/evoral/evoral/SMF.hpp
@@ -64,14 +64,12 @@ public:
 	bool     eof()        const { assert(false); return true; }
 	
 	void begin_write();
-	void append_event_delta(uint32_t delta_t, const Event<Time>& ev);
+	void append_event_delta(uint32_t delta_t, uint32_t size, const uint8_t* buf);
 	void end_write() THROW_FILE_ERROR;
 	
 	void flush() {};
 
 private:
-	static const uint16_t _ppqn = 19200;
-	
 	std::string  _path;
 	smf_t*       _smf;
 	smf_track_t* _smf_track;
diff --git a/libs/evoral/src/SMF.cpp b/libs/evoral/src/SMF.cpp
index 7e5e5935ce..86110b6401 100644
--- a/libs/evoral/src/SMF.cpp
+++ b/libs/evoral/src/SMF.cpp
@@ -211,7 +211,7 @@ SMF<Time>::read_event(uint32_t* delta_t, uint32_t* size, uint8_t** buf) const
     	*size = event_size;
 	
 		/*printf("SMF::read_event:\n");
-		for (size_t i=0; i < *size; ++i) {
+		for (size_t i = 0; i < *size; ++i) {
 			printf("%X ", (*buf)[i]);
 		} printf("\n");*/
     	
@@ -223,28 +223,25 @@ SMF<Time>::read_event(uint32_t* delta_t, uint32_t* size, uint8_t** buf) const
 
 template<typename Time>
 void
-SMF<Time>::append_event_delta(uint32_t delta_t, const Event<Time>& ev)
+SMF<Time>::append_event_delta(uint32_t delta_t, uint32_t size, const uint8_t* buf)
 {
-	assert(ev.size() > 0);
+	if (size == 0) {
+		return;
+	}
 	
 	/*printf("SMF::append_event_delta:\n");
-	for (size_t i=0; i < ev.size(); ++i) {
-		printf("%X ", ev.buffer()[i]);
+	for (size_t i = 0; i < size; ++i) {
+		printf("%X ", buf[i]);
 	} printf("\n");*/
 
 	smf_event_t* event;
 
-	event = smf_event_new_from_pointer((void *) ev.buffer(), int(ev.size()));
+	event = smf_event_new_from_pointer(buf, size);
 	assert(event != NULL);
 	
-	memcpy(event->midi_buffer, ev.buffer(), ev.size());
-	
 	assert(_smf_track);
-	smf_track_add_event_delta_pulses(_smf_track, event, int(delta_t));
-	
-	if (ev.size() > 0) {
-		_empty = false;
-	}
+	smf_track_add_event_delta_pulses(_smf_track, event, delta_t);
+	_empty = false;
 }
 
 template<typename Time>