diff --git a/include/wrapper/NonRealtime.hpp b/include/wrapper/NonRealtime.hpp
index bdcc8b8..5df5f29 100644
--- a/include/wrapper/NonRealtime.hpp
+++ b/include/wrapper/NonRealtime.hpp
@@ -950,17 +950,22 @@ namespace impl {
       
       void next(int)
       {
-                    
+        Wrapper::getInterfaceTable()->fClearUnitOutputs(this, mNumOutputs);
         index id = static_cast<index>(in0(1));
         if(mID != id) init();
         if(!mInit) return;
-        if(auto ptr = mInst.lock())
+        if(mSpinlock.tryLock())
         {
-          auto& client = ptr->mClient;
-          auto& params = ptr->mParams;
-          mControls.reset(mInBuf + ControlOffset());
-          mDelegate.next(*this,client,params,mControls);
-        }else printNotFound(id);
+          if(auto ptr = mInst.lock())
+          {
+            auto& client = ptr->mClient;
+            auto& params = ptr->mParams;
+            mControls.reset(mInBuf + ControlOffset());
+            mDelegate.next(*this,client,params,mControls, ptr.use_count() == 2);
+          }else printNotFound(id);
+          mSpinlock.unlock(); 
+        }
+        
       }
       
     private:
diff --git a/include/wrapper/RealTimeBase.hpp b/include/wrapper/RealTimeBase.hpp
index ab4e324..0249e61 100644
--- a/include/wrapper/RealTimeBase.hpp
+++ b/include/wrapper/RealTimeBase.hpp
@@ -122,14 +122,17 @@ namespace impl{
       }
    }
     
-   void next(SCUnit& unit, Client& client,Params& params,FloatControlsIter& controls)
+   void next(SCUnit& unit, Client& client,Params& params,FloatControlsIter& controls,bool updateParams = true)
    {   
      bool trig =  IsModel_t<Client>::value ? !mPrevTrig  && unit.in0(0) > 0 : false;
 
      mPrevTrig = trig;
      
-     Wrapper::setParams(&unit, params, controls);
-     params.constrainParameterValuesRT(nullptr);
+     if(updateParams)
+     {
+      Wrapper::setParams(&unit, params, controls);
+      params.constrainParameterValuesRT(nullptr);
+     }
      
      for (index i = 0; i < client.audioChannelsIn(); ++i)
      {