diff --git a/source/backend/plugin/Lv2Plugin.cpp b/source/backend/plugin/Lv2Plugin.cpp
index 560c13e0f..debc8ba34 100644
--- a/source/backend/plugin/Lv2Plugin.cpp
+++ b/source/backend/plugin/Lv2Plugin.cpp
@@ -103,7 +103,7 @@ const uint32_t CARLA_URI_MAP_ID_TIME_FRAMES_PER_SECOND = 36;
 const uint32_t CARLA_URI_MAP_ID_TIME_SPEED             = 37;
 const uint32_t CARLA_URI_MAP_ID_MIDI_EVENT             = 38;
 const uint32_t CARLA_URI_MAP_ID_PARAM_SAMPLE_RATE      = 39;
-const uint32_t CARLA_URI_MAP_ID_COUNT                  = 40;
+const uint32_t CARLA_URI_MAP_ID_COUNT                  = 39; // FIXME later
 
 // LV2 Feature Ids
 const uint32_t kFeatureIdBufSizeBounded   =  0;
@@ -1222,6 +1222,7 @@ public:
 
             Lv2AtomQueue tmpQueue;
             tmpQueue.copyAndDumpDataFromQueue(fAtomQueueOut, dumpBuf);
+            CARLA_SAFE_ASSERT(! tmpQueue.isEmpty());
 
             uint32_t portIndex;
             const LV2_Atom* atom;
@@ -1229,8 +1230,6 @@ public:
 
             for (; tmpQueue.get(&atom, &portIndex);)
             {
-                carla_stdout("OUTPUT message IN GUI REMOVED FROM BUFFER");
-
                 if (atom->type == CARLA_URI_MAP_ID_ATOM_WORKER)
                 {
                     CARLA_SAFE_ASSERT_CONTINUE(fExt.worker != nullptr && fExt.worker->work != nullptr);
@@ -1295,6 +1294,8 @@ public:
         aIns = aOuts = cvIns = cvOuts = params = 0;
         LinkedList<unsigned int> evIns, evOuts;
 
+        const uint32_t eventBufferSize(static_cast<uint32_t>(fLv2Options.sequenceSize));
+
         bool forcedStereoIn, forcedStereoOut;
         forcedStereoIn = forcedStereoOut = false;
 
@@ -1393,9 +1394,6 @@ public:
             FLOAT_CLEAR(fParamBuffers, params);
         }
 
-        const uint32_t eventBufferSize(MAX_DEFAULT_BUFFER_SIZE);
-        fLv2Options.sequenceSize = static_cast<int>(eventBufferSize);
-
         if (const uint32_t count = static_cast<uint32_t>(evIns.count()))
         {
             fEventsIn.createNew(count);
@@ -4183,6 +4181,21 @@ public:
         fLv2Options.maxBufferSize = static_cast<int>(pData->engine->getBufferSize());
         fLv2Options.sampleRate    = pData->engine->getSampleRate();
 
+        uint32_t eventBufferSize = MAX_DEFAULT_BUFFER_SIZE;
+
+        for (uint32_t j=0; j < fRdfDescriptor->PortCount; ++j)
+        {
+            const LV2_Property portTypes(fRdfDescriptor->Ports[j].Types);
+
+            if (LV2_IS_PORT_ATOM_SEQUENCE(portTypes) || LV2_IS_PORT_EVENT(portTypes) || LV2_IS_PORT_MIDI_LL(portTypes))
+            {
+                if (fRdfDescriptor->Ports[j].MinimumSize > eventBufferSize)
+                    eventBufferSize = fRdfDescriptor->Ports[j].MinimumSize;
+            }
+        }
+
+        fLv2Options.sequenceSize = static_cast<int>(eventBufferSize);
+
         // ---------------------------------------------------------------
         // initialize features (part 1)
 
@@ -4271,7 +4284,8 @@ public:
         fFeatures[kFeatureIdPrograms]->URI   = LV2_PROGRAMS__Host;
         fFeatures[kFeatureIdPrograms]->data  = programsFt;
 
-        //kFeatureIdResizePort
+        fFeatures[kFeatureIdResizePort]->URI   = LV2_RESIZE_PORT__resize;
+        fFeatures[kFeatureIdResizePort]->data  = rsPortFt;
 
         fFeatures[kFeatureIdRtMemPool]->URI  = LV2_RTSAFE_MEMORY_POOL__Pool;
         fFeatures[kFeatureIdRtMemPool]->data = rtMemPoolFt;
diff --git a/source/modules/lv2_rdf.hpp b/source/modules/lv2_rdf.hpp
index 5705e538d..9f95b971f 100644
--- a/source/modules/lv2_rdf.hpp
+++ b/source/modules/lv2_rdf.hpp
@@ -388,6 +388,8 @@ struct LV2_RDF_Port {
     LV2_RDF_PortPoints Points;
     LV2_RDF_PortUnit Unit;
 
+    uint32_t MinimumSize;
+
     uint32_t ScalePointCount;
     LV2_RDF_PortScalePoint* ScalePoints;
 
@@ -397,6 +399,7 @@ struct LV2_RDF_Port {
           Designation(0),
           Name(nullptr),
           Symbol(nullptr),
+          MinimumSize(0),
           ScalePointCount(0),
           ScalePoints(nullptr) {}
 
diff --git a/source/utils/CarlaLv2Utils.hpp b/source/utils/CarlaLv2Utils.hpp
index cc317699b..547069539 100644
--- a/source/utils/CarlaLv2Utils.hpp
+++ b/source/utils/CarlaLv2Utils.hpp
@@ -61,7 +61,7 @@
 #include "lilv/lilvmm.hpp"
 #include "sratom/sratom.h"
 
-//#include <QtCore/QStringList>
+#include <QtCore/QStringList>
 
 // -----------------------------------------------------------------------
 // Define namespaces and missing prefixes
@@ -197,6 +197,9 @@ public:
     Lilv::Node value_minimum;
     Lilv::Node value_maximum;
 
+    Lilv::Node rz_asLargeAs;
+    Lilv::Node rz_minSize;
+
     // Port Data Types
     Lilv::Node midi_event;
     Lilv::Node patch_message;
@@ -312,6 +315,9 @@ public:
           value_minimum      (new_uri(LV2_CORE__minimum)),
           value_maximum      (new_uri(LV2_CORE__maximum)),
 
+          rz_asLargeAs       (new_uri(LV2_RESIZE_PORT__asLargeAs)),
+          rz_minSize         (new_uri(LV2_RESIZE_PORT__minimumSize)),
+
           midi_event         (new_uri(LV2_MIDI__MidiEvent)),
           patch_message      (new_uri(LV2_PATCH__Message)),
           time_position      (new_uri(LV2_TIME__Position)),
@@ -522,7 +528,6 @@ const LV2_RDF_Descriptor* lv2_rdf_new(const LV2_URI uri, const bool /*fillPreset
         }
     }
 
-#if 0
     // -------------------------------------------------------------------
     // Set Plugin UniqueID
     {
@@ -549,7 +554,6 @@ const LV2_RDF_Descriptor* lv2_rdf_new(const LV2_URI uri, const bool /*fillPreset
             }
         }
     }
-#endif
 
     // -------------------------------------------------------------------
     // Set Plugin Ports
@@ -966,6 +970,22 @@ const LV2_RDF_Descriptor* lv2_rdf_new(const LV2_URI uri, const bool /*fillPreset
                 }
             }
 
+            // -----------------------------------------------------------
+            // Set Port Minimum Size
+            {
+                Lilv::Nodes minimumSizeNodes(lilvPort.get_value(lv2World.rz_minSize));
+
+                if (minimumSizeNodes.size() > 0)
+                {
+                    const int minimumSize(minimumSizeNodes.get_first().as_int());
+
+                    if (minimumSize > 0)
+                        rdfPort->MinimumSize = static_cast<uint32_t>(minimumSize);
+                    else
+                        carla_safe_assert_int("minimumSize > 0", __FILE__, __LINE__, minimumSize);
+                }
+            }
+
             // -----------------------------------------------------------
             // Set Port Scale Points
 
diff --git a/source/utils/Lv2AtomQueue.hpp b/source/utils/Lv2AtomQueue.hpp
index 610a7f577..c022b46ad 100644
--- a/source/utils/Lv2AtomQueue.hpp
+++ b/source/utils/Lv2AtomQueue.hpp
@@ -29,7 +29,8 @@ class Lv2AtomRingBufferControl : public RingBufferControlTemplate<HeapRingBuffer
 {
 public:
     Lv2AtomRingBufferControl()
-        : RingBufferControlTemplate(nullptr)
+        : RingBufferControlTemplate(nullptr),
+          fIsDummy(false)
     {
         fBuffer.size = 0;
         fBuffer.buf  = nullptr;
@@ -37,8 +38,11 @@ public:
 
     ~Lv2AtomRingBufferControl()
     {
-        if (fBuffer.buf != nullptr)
+        if (fBuffer.buf != nullptr && ! fIsDummy)
+        {
             delete[] fBuffer.buf;
+            fBuffer.buf = nullptr;
+        }
     }
 
     // -------------------------------------------------------------------
@@ -47,7 +51,8 @@ public:
     {
         if (fBuffer.buf != nullptr)
         {
-            delete[] fBuffer.buf;
+            if (! fIsDummy)
+                delete[] fBuffer.buf;
             fBuffer.buf = nullptr;
         }
 
@@ -71,8 +76,11 @@ public:
         fBuffer.tail = rb.tail;
         fBuffer.written = rb.written;
         fBuffer.invalidateCommit = rb.invalidateCommit;
+        fIsDummy = true;
 
         std::memcpy(dumpBuf, rb.buf, rb.size);
+
+        setRingBuffer(&fBuffer, false);
     }
 
     // -------------------------------------------------------------------
@@ -125,8 +133,9 @@ public:
 
 private:
     HeapRingBuffer fBuffer;
+    bool fIsDummy;
 
-    static const size_t kMaxDataSize = 2048;
+    static const size_t kMaxDataSize = 8192;
 
     struct RetAtom {
         LV2_Atom atom;