diff --git a/lv2export/test.cpp b/lv2export/test.cpp
index fc323b8..67f0552 100644
--- a/lv2export/test.cpp
+++ b/lv2export/test.cpp
@@ -108,5 +108,16 @@ int main()
                  i+1, q->name.c_str(), q->getDescription().c_str(), q->unit.c_str(),
                  q->minValue, q->maxValue, q->defaultValue);
     }
+
+    Module::ProcessArgs args = {
+        48000.0f,
+        1.0f / 48000.0f,
+        0
+    };
+    for (int i=0; i<96000; ++i)
+    {
+        module->process(args);
+        ++args.frame;
+    }
     return 0;
 }
diff --git a/src/CardinalPlugin.cpp b/src/CardinalPlugin.cpp
index 7b4556f..65bbdcd 100644
--- a/src/CardinalPlugin.cpp
+++ b/src/CardinalPlugin.cpp
@@ -94,7 +94,7 @@ struct Initializer
 #ifdef __MOD_DEVICES__
         settings::threadCount = 3;
 #else
-        settings::threadCount = 1;
+        settings::threadCount = 0;
 #endif
 
         system::init();
@@ -768,7 +768,10 @@ protected:
             const MutexLocker cml(fDeviceMutex);
 
             if (fCurrentAudioDevice != nullptr)
+            {
+                rack::contextSet(context);
                 fCurrentAudioDevice->onStartStream();
+            }
         }
     }
 
@@ -778,7 +781,10 @@ protected:
             const MutexLocker cml(fDeviceMutex);
 
             if (fCurrentAudioDevice != nullptr)
+            {
+                rack::contextSet(context);
                 fCurrentAudioDevice->onStopStream();
+            }
         }
 
         delete[] fAudioBufferOut;
@@ -866,6 +872,13 @@ protected:
         }
     }
 
+    void sampleRateChanged(const double newSampleRate) override
+    {
+        rack::contextSet(context);
+        rack::settings::sampleRate = newSampleRate;
+        context->engine->setSampleRate(newSampleRate);
+    }
+
     // -------------------------------------------------------------------------------------------------------
 
 private:
diff --git a/src/CardinalUI.cpp b/src/CardinalUI.cpp
index 1958d32..e5e0266 100644
--- a/src/CardinalUI.cpp
+++ b/src/CardinalUI.cpp
@@ -129,10 +129,12 @@ public:
 
     ~CardinalUI() override
     {
-        const ScopedContext sc(this);
+        rack::contextSet(fContext);
 
         delete fContext->window;
         fContext->window = nullptr;
+
+        rack::contextSet(nullptr);
     }
 
     void onNanoDisplay() override
@@ -513,9 +515,8 @@ protected:
         if (filename == nullptr)
             return;
 
-        // we cannot lock here
-        // const ScopedContext sc(this);
         rack::contextSet(fContext);
+        WindowParametersRestore(fContext->window);
         fContext->patch->loadAction(filename);
     }