diff --git a/libs/ardour/ardour/buffer_set.h b/libs/ardour/ardour/buffer_set.h
index 4cea72400c..f05804f15e 100644
--- a/libs/ardour/ardour/buffer_set.h
+++ b/libs/ardour/ardour/buffer_set.h
@@ -123,10 +123,10 @@ public:
 	void ensure_lv2_bufsize(bool input, size_t i, size_t buffer_capacity);
 
 	/** Flush modified LV2 event output buffers back to Ardour buffers */
-	void flush_lv2_midi(bool input, size_t i);
+	void flush_lv2_midi(bool input, size_t i, pframes_t, samplecnt_t);
 
 	/** Forward plugin MIDI output to to Ardour buffers */
-	void forward_lv2_midi(LV2_Evbuf*, size_t, bool purge_ardour_buffer = true);
+	void forward_lv2_midi(LV2_Evbuf*, size_t, pframes_t, samplecnt_t);
 
 #if defined WINDOWS_VST_SUPPORT || defined LXVST_SUPPORT || defined MACVST_SUPPORT
 	VstEvents* get_vst_midi (size_t);
diff --git a/libs/ardour/buffer_set.cc b/libs/ardour/buffer_set.cc
index 68bb12732c..d46c7c5264 100644
--- a/libs/ardour/buffer_set.cc
+++ b/libs/ardour/buffer_set.cc
@@ -285,12 +285,10 @@ BufferSet::get_lv2_midi(bool input, size_t i)
 }
 
 void
-BufferSet::forward_lv2_midi(LV2_Evbuf* buf, size_t i, bool purge_ardour_buffer)
+BufferSet::forward_lv2_midi(LV2_Evbuf* buf, size_t i, pframes_t n_samples, samplecnt_t offset)
 {
 	MidiBuffer& mbuf  = get_midi(i);
-	if (purge_ardour_buffer) {
-		mbuf.silence(0, 0);
-	}
+	mbuf.silence (n_samples, offset);
 	for (LV2_Evbuf_Iterator i = lv2_evbuf_begin(buf);
 			 lv2_evbuf_is_valid(i);
 			 i = lv2_evbuf_next(i)) {
@@ -298,19 +296,19 @@ BufferSet::forward_lv2_midi(LV2_Evbuf* buf, size_t i, bool purge_ardour_buffer)
 		uint8_t* data;
 		lv2_evbuf_get(i, &samples, &subframes, &type, &size, &data);
 		if (type == URIMap::instance().urids.midi_MidiEvent) {
-			mbuf.push_back(samples, Evoral::MIDI_EVENT, size, data);
+			mbuf.push_back(samples + offset, Evoral::MIDI_EVENT, size, data);
 		}
 	}
 }
 
 void
-BufferSet::flush_lv2_midi(bool input, size_t i)
+BufferSet::flush_lv2_midi(bool input, size_t i, pframes_t n_samples, samplecnt_t offset)
 {
 	MidiBuffer&            mbuf  = get_midi(i);
 	LV2Buffers::value_type b     = _lv2_buffers.at(i * 2 + (input ? 0 : 1));
 	LV2_Evbuf*             evbuf = b.second;
 
-	mbuf.silence(0, 0);
+	mbuf.silence (n_samples, offset);
 	for (LV2_Evbuf_Iterator i = lv2_evbuf_begin(evbuf);
 	     lv2_evbuf_is_valid(i);
 	     i = lv2_evbuf_next(i)) {
@@ -328,7 +326,7 @@ BufferSet::flush_lv2_midi(bool input, size_t i)
 #endif
 		if (type == URIMap::instance().urids.midi_MidiEvent) {
 			// TODO: Make Ardour event buffers generic so plugins can communicate
-			mbuf.push_back(samples, Evoral::MIDI_EVENT, size, data);
+			mbuf.push_back(samples + offset, Evoral::MIDI_EVENT, size, data);
 		}
 	}
 }
diff --git a/libs/ardour/lv2_plugin.cc b/libs/ardour/lv2_plugin.cc
index c3c6933bae..1142afa0c6 100644
--- a/libs/ardour/lv2_plugin.cc
+++ b/libs/ardour/lv2_plugin.cc
@@ -2912,13 +2912,13 @@ LV2Plugin::connect_and_run(BufferSet& bufs,
 
 				while (m != m_end || ((tempo_map_point != tempo_map_points.end()) && ((*tempo_map_point).sample(TEMPORAL_SAMPLE_RATE) < tend))) {
 
-					if (m != m_end && ((tempo_map_point == tempo_map_points.end()) || (*tempo_map_point).sample(TEMPORAL_SAMPLE_RATE) > (*m).time())) {
+					if (m != m_end && ((tempo_map_point == tempo_map_points.end()) || (*tempo_map_point).sample(TEMPORAL_SAMPLE_RATE) > (*m).time() + offset)) {
 
 						const Evoral::Event<samplepos_t> ev (*m, false);
 
-						if (ev.time() < nframes) {
+						if (ev.time() >= offset && ev.time() < offset + nframes) {
 							LV2_Evbuf_Iterator eend = lv2_evbuf_end(_ev_buffers[port_index]);
-							lv2_evbuf_write(&eend, ev.time(), 0, type, ev.size(), ev.buffer());
+							lv2_evbuf_write(&eend, ev.time() - offset, 0, type, ev.size(), ev.buffer());
 						}
 
 						++m;
@@ -3041,7 +3041,7 @@ LV2Plugin::connect_and_run(BufferSet& bufs,
 			const uint32_t buf_index = out_map.get(
 				DataType::MIDI, midi_out_index++, &valid);
 			if (valid) {
-				bufs.forward_lv2_midi(_ev_buffers[port_index], buf_index);
+				bufs.forward_lv2_midi(_ev_buffers[port_index], buf_index, nframes, offset);
 			}
 		}
 		// Flush MIDI (write back to Ardour MIDI buffers) -- MIDI THRU
@@ -3049,7 +3049,7 @@ LV2Plugin::connect_and_run(BufferSet& bufs,
 			const uint32_t buf_index = out_map.get(
 				DataType::MIDI, midi_out_index++, &valid);
 			if (valid) {
-				bufs.flush_lv2_midi(true, buf_index);
+				bufs.flush_lv2_midi (true, buf_index, nframes, offset);
 			}
 		}