diff --git a/3rdparty/libossia b/3rdparty/libossia
index 0fb5beb3a0..062cdfa696 160000
--- a/3rdparty/libossia
+++ b/3rdparty/libossia
@@ -1 +1 @@
-Subproject commit 0fb5beb3a0196781096314ac6b01973f191fbbf8
+Subproject commit 062cdfa69606374bc635874555a64a1be15ae5f1
diff --git a/src/plugins/score-plugin-avnd/Crousti/Executor.hpp b/src/plugins/score-plugin-avnd/Crousti/Executor.hpp
index b862f03470..a8feec0008 100644
--- a/src/plugins/score-plugin-avnd/Crousti/Executor.hpp
+++ b/src/plugins/score-plugin-avnd/Crousti/Executor.hpp
@@ -34,6 +34,8 @@
 
 #include <score/tools/ThreadPool.hpp>
 
+#include <ossia/detail/type_if.hpp>
+
 #include <QTimer>
 
 #include <avnd/binding/ossia/data_node.hpp>
@@ -598,56 +600,6 @@ struct ExecutorGuiUpdate
   }
 };
 
-template <typename T, bool Predicate>
-struct type_if;
-template <typename T>
-struct type_if<T, false>
-{
-  type_if() = default;
-  type_if(const type_if&) = default;
-  type_if(type_if&&) = default;
-  type_if& operator=(const type_if&) = default;
-  type_if& operator=(type_if&&) = default;
-
-  template <typename U>
-  type_if(U&&)
-  {
-  }
-  template <typename U>
-  T& operator=(U&& u) noexcept
-  {
-    return *this;
-  }
-};
-
-template <typename T>
-struct type_if<T, true>
-{
-  [[no_unique_address]] T value;
-
-  type_if() = default;
-  type_if(const type_if&) = default;
-  type_if(type_if&&) = default;
-  type_if& operator=(const type_if&) = default;
-  type_if& operator=(type_if&&) = default;
-
-  template <typename U>
-  type_if(U&& other)
-      : value{std::forward<U>(other)}
-  {
-  }
-
-  operator const T&() const noexcept { return value; }
-  operator T&() noexcept { return value; }
-  operator T&&() && noexcept { return std::move(value); }
-
-  template <typename U>
-  T& operator=(U&& u) noexcept
-  {
-    return value = std::forward<U>(u);
-  }
-};
-
 template <typename Node>
 class CustomNodeProcess : public ossia::node_process
 {
@@ -683,7 +635,7 @@ class Executor final
     return static_key() == other || Execution::ProcessComponent::base_key_match(other);
   }
 
-  [[no_unique_address]] type_if<int, is_gpu<Node>> node_id = -1;
+  [[no_unique_address]] ossia::type_if<int, is_gpu<Node>> node_id = -1;
 
   Executor(ProcessModel<Node>& element, const ::Execution::Context& ctx, QObject* p)
       : Execution::ProcessComponent_T<ProcessModel<Node>, ossia::node_process>{
diff --git a/src/plugins/score-plugin-avnd/Crousti/ProcessModel.hpp b/src/plugins/score-plugin-avnd/Crousti/ProcessModel.hpp
index 71822739c2..2da47b6c53 100644
--- a/src/plugins/score-plugin-avnd/Crousti/ProcessModel.hpp
+++ b/src/plugins/score-plugin-avnd/Crousti/ProcessModel.hpp
@@ -5,11 +5,13 @@
 
 #include <Crousti/Attributes.hpp>
 #include <Crousti/Concepts.hpp>
+#include <Crousti/MessageBus.hpp>
 #include <Crousti/Metadata.hpp>
 #include <Crousti/Metadatas.hpp>
 #include <Crousti/ProcessModelPortInit.hpp>
 #include <Dataflow/Commands/CableHelpers.hpp>
 
+#include <ossia/detail/type_if.hpp>
 #include <ossia/detail/typelist.hpp>
 
 #include <boost/pfr.hpp>
@@ -78,8 +80,8 @@ class ProcessModel final
   [[no_unique_address]]
   oscr::dynamic_ports_storage<Info> dynamic_ports;
 
-  std::conditional_t<oscr::has_dynamic_ports<Info>, Info, char>
-      object_storage_for_ports_callbacks;
+  [[no_unique_address]]
+  ossia::type_if<Info, oscr::has_dynamic_ports<Info>> object_storage_for_ports_callbacks;
 
   ProcessModel(
       const TimeVal& duration, const Id<Process::ProcessModel>& id, QObject* parent)
@@ -180,10 +182,10 @@ class ProcessModel final
         || avnd::dynamic_ports_output_introspection<Info>::size > 0)
     {
       avnd::control_input_introspection<Info>::for_all_n2(
-          avnd::get_inputs<Info>(this->object_storage_for_ports_callbacks),
+          avnd::get_inputs<Info>((Info&)this->object_storage_for_ports_callbacks),
           [this]<std::size_t Idx, typename F>(
               F& field, auto pred_index, avnd::field_index<Idx>) {
-        auto& obj = this->object_storage_for_ports_callbacks;
+        Info& obj = this->object_storage_for_ports_callbacks;
         if constexpr(requires { F::on_controller_setup(); })
         {
           auto controller_inlets = avnd_input_idx_to_model_ports(Idx);
@@ -205,7 +207,7 @@ class ProcessModel final
           connect(
               inlet, &Process::ControlInlet::valueChanged,
               [this, &field](const ossia::value& val) {
-            auto& obj = this->object_storage_for_ports_callbacks;
+            Info& obj = this->object_storage_for_ports_callbacks;
             oscr::from_ossia_value(val, field.value);
 
             if_possible(field.update(obj));
@@ -214,6 +216,21 @@ class ProcessModel final
           });
         }
       });
+
+      if constexpr(avnd::has_gui_to_processor_bus<Info>)
+      {
+        // FIXME needs to be a list of callbacks?
+      }
+
+      if constexpr(avnd::has_processor_to_gui_bus<Info>)
+      {
+        Info& obj = this->object_storage_for_ports_callbacks;
+
+        obj.send_message = [this]<typename T>(T&& b) mutable {
+          if(this->to_ui)
+            MessageBusSender{this->to_ui}(std::move(b));
+        };
+      }
     }
   }
 
@@ -255,7 +272,7 @@ class ProcessModel final
 
     if constexpr(avnd::dynamic_ports_input_introspection<Info>::size > 0)
     {
-      auto& obj = object_storage_for_ports_callbacks;
+      Info& obj = object_storage_for_ports_callbacks;
       avnd::dynamic_ports_input_introspection<Info>::for_all_n2(
           avnd::get_inputs(obj),
           [&]<std::size_t N>(auto& port, auto pred_idx, avnd::field_index<N> field_idx) {
@@ -274,7 +291,7 @@ class ProcessModel final
 
     if constexpr(avnd::dynamic_ports_output_introspection<Info>::size > 0)
     {
-      auto& obj = object_storage_for_ports_callbacks;
+      Info& obj = object_storage_for_ports_callbacks;
       avnd::dynamic_ports_output_introspection<Info>::for_all_n2(
           avnd::get_outputs(obj),
           [&]<std::size_t N>(auto& port, auto pred_idx, avnd::field_index<N> field_idx) {