diff --git a/lv2/sfizz.c b/lv2/sfizz.c
index 0b2f6402..b0b9ab5d 100644
--- a/lv2/sfizz.c
+++ b/lv2/sfizz.c
@@ -416,7 +416,8 @@ activate(LV2_Handle instance)
 static void
 deactivate(LV2_Handle instance)
 {
-    UNUSED(instance);
+    sfizz_plugin_t *self = (sfizz_plugin_t *)instance;
+    sfizz_all_sound_off(self->synth);
 }
 
 static void
diff --git a/src/sfizz.h b/src/sfizz.h
index c9da6d85..4063d498 100644
--- a/src/sfizz.h
+++ b/src/sfizz.h
@@ -369,6 +369,13 @@ SFIZZ_EXPORTED_API void sfizz_enable_logging(sfizz_synth_t* synth);
  */
 SFIZZ_EXPORTED_API void sfizz_disable_logging(sfizz_synth_t* synth);
 
+/**
+ * @brief Shuts down the current processing, clear buffers and reset the voices.
+ *
+ * @param synth
+ */
+SFIZZ_EXPORTED_API void sfizz_all_sound_off(sfizz_synth_t* synth);
+
 #ifdef __cplusplus
 }
 #endif
diff --git a/src/sfizz.hpp b/src/sfizz.hpp
index be2785b3..199729bf 100644
--- a/src/sfizz.hpp
+++ b/src/sfizz.hpp
@@ -256,6 +256,11 @@ public:
      *
      */
     void disableLogging() noexcept;
+    /**
+     * @brief Shuts down the current processing, clear buffers and reset the voices.
+     *
+     */
+    void allSoundOff() noexcept;
 private:
     std::unique_ptr<sfz::Synth> synth;
 };
diff --git a/src/sfizz/Synth.cpp b/src/sfizz/Synth.cpp
index 8f7612ef..56c5126c 100644
--- a/src/sfizz/Synth.cpp
+++ b/src/sfizz/Synth.cpp
@@ -962,3 +962,16 @@ void sfz::Synth::disableLogging() noexcept
 {
     resources.logger.disableLogging();
 }
+
+void sfz::Synth::allSoundOff() noexcept
+{
+    AtomicDisabler callbackDisabler{ canEnterCallback };
+    while (inCallback) {
+        std::this_thread::sleep_for(std::chrono::milliseconds(1));
+    }
+
+    for (auto &voice: voices)
+        voice->reset();
+    for (auto& effectBus: effectBuses)
+        effectBus->clear();
+}
diff --git a/src/sfizz/Synth.h b/src/sfizz/Synth.h
index 41a56c53..2fb1eb16 100644
--- a/src/sfizz/Synth.h
+++ b/src/sfizz/Synth.h
@@ -361,6 +361,12 @@ public:
      *
      */
     void disableLogging() noexcept;
+
+    /**
+     * @brief Shuts down the current processing, clear buffers and reset the voices.
+     *
+     */
+    void allSoundOff() noexcept;
 protected:
     /**
      * @brief The parser callback; this is called by the parent object each time
diff --git a/src/sfizz/sfizz.cpp b/src/sfizz/sfizz.cpp
index 61e5a0c5..ee4ef4f1 100644
--- a/src/sfizz/sfizz.cpp
+++ b/src/sfizz/sfizz.cpp
@@ -195,3 +195,8 @@ void sfz::Sfizz::disableLogging() noexcept
 {
     synth->disableLogging();
 }
+
+void sfz::Sfizz::allSoundOff() noexcept
+{
+    synth->allSoundOff();
+}
diff --git a/src/sfizz/sfizz_wrapper.cpp b/src/sfizz/sfizz_wrapper.cpp
index 32ab355a..7e18d2f6 100644
--- a/src/sfizz/sfizz_wrapper.cpp
+++ b/src/sfizz/sfizz_wrapper.cpp
@@ -237,12 +237,19 @@ void sfizz_enable_logging(sfizz_synth_t* synth)
     auto self = reinterpret_cast<sfz::Synth*>(synth);
     return self->enableLogging();
 }
+
 void sfizz_disable_logging(sfizz_synth_t* synth)
 {
     auto self = reinterpret_cast<sfz::Synth*>(synth);
     return self->disableLogging();
 }
 
+void sfizz_all_sound_off(sfizz_synth_t* synth)
+{
+    auto self = reinterpret_cast<sfz::Synth*>(synth);
+    return self->allSoundOff();
+}
+
 #ifdef __cplusplus
 }
 #endif
diff --git a/tests/SynthT.cpp b/tests/SynthT.cpp
index 9ed0c73c..70806b5e 100644
--- a/tests/SynthT.cpp
+++ b/tests/SynthT.cpp
@@ -26,6 +26,17 @@ TEST_CASE("[Synth] Play and check active voices")
     REQUIRE(synth.getNumActiveVoices() == 0);
 }
 
+TEST_CASE("[Synth] All sound off")
+{
+    sfz::Synth synth;
+    synth.loadSfzFile(fs::current_path() / "tests/TestFiles/groups_avl.sfz");
+    synth.noteOn(0, 36, 24);
+    synth.noteOn(0, 36, 89);
+    REQUIRE(synth.getNumActiveVoices() == 2);
+    synth.allSoundOff();
+    REQUIRE(synth.getNumActiveVoices() == 0);
+}
+
 TEST_CASE("[Synth] Change the number of voice while playing")
 {
     sfz::Synth synth;
diff --git a/vst/SfizzVstProcessor.cpp b/vst/SfizzVstProcessor.cpp
index 62d6b785..97795c41 100644
--- a/vst/SfizzVstProcessor.cpp
+++ b/vst/SfizzVstProcessor.cpp
@@ -46,6 +46,9 @@ tresult PLUGIN_API SfizzVstProcessor::initialize(FUnknown* context)
 
     _state = SfizzVstState();
 
+    fprintf(stderr, "[sfizz] new synth\n");
+    _synth.reset(new sfz::Sfizz);
+
     return result;
 }
 
@@ -105,21 +108,20 @@ tresult PLUGIN_API SfizzVstProcessor::canProcessSampleSize(int32 symbolicSampleS
 
 tresult PLUGIN_API SfizzVstProcessor::setActive(TBool state)
 {
-    stopBackgroundWork();
-    _synth.reset();
+    sfz::Sfizz* synth = _synth.get();
+
+    if (!synth)
+        return kResultFalse;
 
     if (state) {
-        fprintf(stderr, "[Sfizz] new synth\n");
-        sfz::Sfizz* synth = new sfz::Sfizz;
-        _synth.reset(synth);
-
         synth->setSampleRate(processSetup.sampleRate);
         synth->setSamplesPerBlock(processSetup.maxSamplesPerBlock);
 
-        syncStateToSynth();
-
         _workRunning = true;
         _worker = std::thread([this]() { doBackgroundWork(); });
+    } else {
+        synth->allSoundOff();
+        stopBackgroundWork();
     }
 
     return kResultTrue;