diff --git a/src/common/logging/vst3.cpp b/src/common/logging/vst3.cpp
index 37a4fff5..4d548f5a 100644
--- a/src/common/logging/vst3.cpp
+++ b/src/common/logging/vst3.cpp
@@ -200,6 +200,15 @@ void Vst3Logger::log_request(bool is_host_vst,
     });
 }
 
+void Vst3Logger::log_request(bool is_host_vst,
+                             const YaComponent::SetProcessing& request) {
+    log_request_base(is_host_vst, [&](auto& message) {
+        message << "<IAudioProcessor* #" << request.instance_id
+                << ">::setProcessing(state = "
+                << (request.state ? "true" : "false") << ")";
+    });
+}
+
 void Vst3Logger::log_request(bool is_host_vst,
                              const YaPluginFactory::Construct&) {
     log_request_base(is_host_vst,
diff --git a/src/common/logging/vst3.h b/src/common/logging/vst3.h
index 94eaff66..09bcf269 100644
--- a/src/common/logging/vst3.h
+++ b/src/common/logging/vst3.h
@@ -74,6 +74,7 @@ class Vst3Logger {
                      const YaComponent::CanProcessSampleSize&);
     void log_request(bool is_host_vst, const YaComponent::GetLatencySamples&);
     void log_request(bool is_host_vst, const YaComponent::SetupProcessing&);
+    void log_request(bool is_host_vst, const YaComponent::SetProcessing&);
     void log_request(bool is_host_vst, const YaPluginFactory::Construct&);
     void log_request(bool is_host_vst, const YaPluginFactory::SetHostContext&);
     void log_request(bool is_host_vst, const WantsConfiguration&);
diff --git a/src/common/serialization/vst3.h b/src/common/serialization/vst3.h
index 57563b0c..0b82b726 100644
--- a/src/common/serialization/vst3.h
+++ b/src/common/serialization/vst3.h
@@ -74,6 +74,7 @@ using ControlRequest = std::variant<YaComponent::Construct,
                                     YaComponent::CanProcessSampleSize,
                                     YaComponent::GetLatencySamples,
                                     YaComponent::SetupProcessing,
+                                    YaComponent::SetProcessing,
                                     YaPluginFactory::Construct,
                                     YaPluginFactory::SetHostContext>;
 
diff --git a/src/common/serialization/vst3/component.h b/src/common/serialization/vst3/component.h
index 54a54cf1..6c0285aa 100644
--- a/src/common/serialization/vst3/component.h
+++ b/src/common/serialization/vst3/component.h
@@ -560,6 +560,25 @@ class YaComponent : public Steinberg::Vst::IComponent,
 
     virtual tresult PLUGIN_API
     setupProcessing(Steinberg::Vst::ProcessSetup& setup) override = 0;
+
+    /**
+     * Message to pass through a call to `IAudioProcessor::setProcessing(state)`
+     * to the Wine plugin host.
+     */
+    struct SetProcessing {
+        using Response = UniversalTResult;
+
+        native_size_t instance_id;
+
+        TBool state;
+
+        template <typename S>
+        void serialize(S& s) {
+            s.value8b(instance_id);
+            s.value1b(state);
+        }
+    };
+
     virtual tresult PLUGIN_API setProcessing(TBool state) override = 0;
     virtual tresult PLUGIN_API
     process(Steinberg::Vst::ProcessData& data) override = 0;
diff --git a/src/plugin/bridges/vst3-impls/component.cpp b/src/plugin/bridges/vst3-impls/component.cpp
index 9790b299..cbdb321d 100644
--- a/src/plugin/bridges/vst3-impls/component.cpp
+++ b/src/plugin/bridges/vst3-impls/component.cpp
@@ -194,9 +194,8 @@ YaComponentPluginImpl::setupProcessing(Steinberg::Vst::ProcessSetup& setup) {
 }
 
 tresult PLUGIN_API YaComponentPluginImpl::setProcessing(TBool state) {
-    // TODO: Implement
-    bridge.logger.log("TODO: IAudioProcessor::setProcessing()");
-    return Steinberg::kNotImplemented;
+    return bridge.send_message(YaComponent::SetProcessing{
+        .instance_id = arguments.instance_id, .state = state});
 }
 
 tresult PLUGIN_API
diff --git a/src/wine-host/bridges/vst3.cpp b/src/wine-host/bridges/vst3.cpp
index e65e1cdb..d42952f2 100644
--- a/src/wine-host/bridges/vst3.cpp
+++ b/src/wine-host/bridges/vst3.cpp
@@ -200,6 +200,11 @@ void Vst3Bridge::run() {
                 return component_instances[request.instance_id]
                     .audio_processor->setupProcessing(request.setup);
             },
+            [&](const YaComponent::SetProcessing& request)
+                -> YaComponent::SetProcessing::Response {
+                return component_instances[request.instance_id]
+                    .audio_processor->setProcessing(request.state);
+            },
             [&](const YaPluginFactory::Construct&)
                 -> YaPluginFactory::Construct::Response {
                 return YaPluginFactory::ConstructArgs(