Also add an Editor::param_modulation_changed()

nih_plug_egui/src/editor.rs

@@ -107,6 +107,8 @@ where
         // that boolean is set.
     }
 
+    fn param_modulation_changed(&self, _id: &str, _modulation_offset: f32) {}
+
     fn param_values_changed(&self) {
         // Same
     }

nih_plug_iced/src/editor.rs

@@ -109,6 +109,10 @@ impl<E: IcedEditor> Editor for IcedEditorWrapper<E> {
         let _ = self.parameter_updates_sender.try_send(ParameterUpdate);
     }
 
+    fn param_modulation_changed(&self, _id: &str, _modulation_offset: f32) {
+        let _ = self.parameter_updates_sender.try_send(ParameterUpdate);
+    }
+
     fn param_values_changed(&self) {
         let _ = self.parameter_updates_sender.try_send(ParameterUpdate);
     }

nih_plug_vizia/src/editor.rs

@@ -131,6 +131,11 @@ impl Editor for ViziaEditor {
             .store(true, Ordering::Relaxed);
     }
 
+    fn param_modulation_changed(&self, _id: &str, _modulation_offset: f32) {
+        self.emit_parameters_changed_event
+            .store(true, Ordering::Relaxed);
+    }
+
     fn param_values_changed(&self) {
         self.emit_parameters_changed_event
             .store(true, Ordering::Relaxed);

src/editor.rs

@@ -58,9 +58,14 @@ pub trait Editor: Send {
     /// new value for a parameter or when a parameter change sent to the host gets processed.
     fn param_value_changed(&self, id: &str, normalized_value: f32);
 
-    /// Called whenever one or more parameter values changed while the editor is open. This may be
-    /// called in place of [`param_value_changed()`][Self::param_value_changed()] when multiple
-    /// parameter values hcange at the same time. For example, when a preset is loaded.
+    /// Called whenever a specific parameter's monophonic modulation value has changed while the
+    /// editor is open.
+    fn param_modulation_changed(&self, id: &str, modulation_offset: f32);
+
+    /// Called whenever one or more parameter values or modulations have changed while the editor is
+    /// open. This may be called in place of [`param_value_changed()`][Self::param_value_changed()]
+    /// when multiple parameter values hcange at the same time. For example, when a preset is
+    /// loaded.
     fn param_values_changed(&self);
 
     // TODO: Reconsider adding a tick function here for the Linux `IRunLoop`. To keep this platform