diff --git a/src/sfizz/Synth.cpp b/src/sfizz/Synth.cpp
index 2d7f2a92..d11c10a0 100644
--- a/src/sfizz/Synth.cpp
+++ b/src/sfizz/Synth.cpp
@@ -898,26 +898,6 @@ void Synth::setSampleRate(float sampleRate) noexcept
     }
 }
 
-void Synth::Impl::updateRegions() noexcept
-{
-    std::unique_lock<SpinMutex> lock { regionUpdatesMutex_, std::try_to_lock };
-    if (!lock.owns_lock())
-        return;
-
-    absl::c_sort(regionUpdates_, [](const OpcodeUpdate& lhs, const OpcodeUpdate& rhs) {
-        return lhs.delay < rhs.delay;
-    });
-
-    for (auto& update: regionUpdates_) {
-        if (!update.region)
-            continue;
-
-        update.region->parseOpcode(update.opcode, false);
-    }
-
-    regionUpdates_.clear();
-}
-
 void Synth::renderBlock(AudioSpan<float> buffer) noexcept
 {
     Impl& impl = *impl_;
@@ -947,8 +927,6 @@ void Synth::renderBlock(AudioSpan<float> buffer) noexcept
         impl.resources_.filePool.triggerGarbageCollection();
     }
 
-    impl.updateRegions();
-
     auto tempSpan = impl.resources_.bufferPool.getStereoBuffer(numFrames);
     auto tempMixSpan = impl.resources_.bufferPool.getStereoBuffer(numFrames);
     auto rampSpan = impl.resources_.bufferPool.getBuffer(numFrames);
diff --git a/src/sfizz/SynthMessaging.cpp b/src/sfizz/SynthMessaging.cpp
index fd5de3fb..8ba1a216 100644
--- a/src/sfizz/SynthMessaging.cpp
+++ b/src/sfizz/SynthMessaging.cpp
@@ -1364,45 +1364,54 @@ void sfz::Synth::dispatchMessage(Client& client, int delay, const char* path, co
             Layer& layer = *impl.layers_[idx];      \
             Region& region = layer.getRegion();
 
+        #define GET_FILTER_OR_BREAK(idx)          \
+            if (idx >= region.filters.size())     \
+                break;                            \
+            auto& filter = region.filters[idx];
+
+        #define GET_LFO_OR_BREAK(idx)             \
+            if (idx >= region.lfos.size())        \
+                break;                            \
+            auto& lfo = region.lfos[idx];
+
+        #define GET_LFO_SUB_OR_BREAK(idx)         \
+            if (idx >= lfo.sub.size())            \
+                break;                            \
+            auto& sub = lfo.sub[idx];
+
         MATCH("/region&/pitch_keycenter", "i") {
             GET_REGION_OR_BREAK(indices[0])
-            std::lock_guard<SpinMutex> lock { impl.regionUpdatesMutex_ };
-            Impl::OpcodeUpdate update { delay, &region,
-                Opcode { "pitch_keycenter", std::to_string(args[0].i) } };
-            impl.regionUpdates_.emplace_back(update);
+            region.pitchKeycenter = Opcode::transform(Default::key, args[0].i);
         } break;
 
         MATCH("/region&/loop_mode", "s") {
             GET_REGION_OR_BREAK(indices[0])
-            std::lock_guard<SpinMutex> lock { impl.regionUpdatesMutex_ };
-            Impl::OpcodeUpdate update { delay, &region,
-                Opcode { "loop_mode", args[0].s } };
-            impl.regionUpdates_.emplace_back(update);
+            region.loopMode = Opcode::readOptional(Default::loopMode, args[0].s);
         } break;
 
         MATCH("/region&/filter&/type", "s") {
             GET_REGION_OR_BREAK(indices[0])
-            if (indices[1] >= region.filters.size())
-                break;
-
-            std::lock_guard<SpinMutex> lock { impl.regionUpdatesMutex_ };
-            Impl::OpcodeUpdate update { delay, &region,
-                Opcode { absl::StrCat("fil", indices[1] + 1 , "_type "), args[0].s } };
-            impl.regionUpdates_.emplace_back(update);
+            GET_FILTER_OR_BREAK(indices[1])
+            filter.type = Opcode::read(Default::filter, args[0].s);
         } break;
 
         MATCH("/region&/lfo&/wave", "i") {
-            GET_REGION_OR_BREAK(indices[0])
-            if (indices[1] >= region.lfos.size())
-                break;
+            indices[2] = 0;
+            goto set_lfoN_wave;
+        }
 
-            std::lock_guard<SpinMutex> lock { impl.regionUpdatesMutex_ };
-            Impl::OpcodeUpdate update { delay, &region,
-                Opcode { absl::StrCat("lfo", indices[1] + 1, "_wave1"), std::to_string(args[0].i) } };
-            impl.regionUpdates_.emplace_back(update);
+        MATCH("/region&/lfo&/wave&", "i") {
+        set_lfoN_wave:
+            GET_REGION_OR_BREAK(indices[0])
+            GET_LFO_OR_BREAK(indices[1])
+            GET_LFO_SUB_OR_BREAK(indices[2])
+            sub.wave = Opcode::transform(Default::lfoWave, args[0].i);
         } break;
 
         #undef GET_REGION_OR_BREAK
+        #undef GET_FILTER_OR_BREAK
+        #undef GET_LFO_OR_BREAK
+        #undef GET_LFO_SUB_OR_BREAK
 
         //----------------------------------------------------------------------
         // Voices
diff --git a/src/sfizz/SynthPrivate.h b/src/sfizz/SynthPrivate.h
index 1b8b85d3..157bba4b 100644
--- a/src/sfizz/SynthPrivate.h
+++ b/src/sfizz/SynthPrivate.h
@@ -180,12 +180,6 @@ struct Synth::Impl final: public Parser::Listener {
      */
     void finalizeSfzLoad();
 
-    /**
-     * @brief Update the regions with the opcodes received through OSC if necessary
-     *
-     */
-    void updateRegions() noexcept;
-
     template<class T>
     static void collectUsedCCsFromCCMap(BitArray<config::numCCs>& usedCCs, const CCMap<T> map) noexcept
     {
@@ -348,16 +342,6 @@ struct Synth::Impl final: public Parser::Listener {
     }
 
     bool playheadMoved_ { false };
-
-    struct OpcodeUpdate
-    {
-        int delay;
-        Region* region;
-        Opcode opcode;
-    };
-
-    std::vector<OpcodeUpdate> regionUpdates_;
-    SpinMutex regionUpdatesMutex_;
 };
 
 } // namespace sfz