diff --git a/src/common/logging/vst3.cpp b/src/common/logging/vst3.cpp
index 5dfc079b..563b842b 100644
--- a/src/common/logging/vst3.cpp
+++ b/src/common/logging/vst3.cpp
@@ -1766,6 +1766,19 @@ void Vst3Logger::log_response(
     });
 }
 
+void Vst3Logger::log_response(
+    bool is_host_vst,
+    const YaAudioProcessor::SetupProcessingResponse& response) {
+    log_response_base(is_host_vst, [&](auto& message) {
+        message << response.result.string();
+        if (response.result == Steinberg::kResultOk) {
+            message << ", <shared memory configuration for \""
+                    << response.audio_buffers_config.name << "\", "
+                    << response.audio_buffers_config.size << " bytes>";
+        }
+    });
+}
+
 void Vst3Logger::log_response(
     bool is_host_vst,
     const YaAudioProcessor::ProcessResponse& response) {
diff --git a/src/common/logging/vst3.h b/src/common/logging/vst3.h
index 7e298226..6d1ca160 100644
--- a/src/common/logging/vst3.h
+++ b/src/common/logging/vst3.h
@@ -309,6 +309,8 @@ class Vst3Logger {
 
     void log_response(bool is_host_vst,
                       const YaAudioProcessor::GetBusArrangementResponse&);
+    void log_response(bool is_host_vst,
+                      const YaAudioProcessor::SetupProcessingResponse&);
     void log_response(bool is_host_vst,
                       const YaAudioProcessor::ProcessResponse&);
     void log_response(bool is_host_vst,
diff --git a/src/common/serialization/vst3/plugin/audio-processor.h b/src/common/serialization/vst3/plugin/audio-processor.h
index 4e32107f..2d3743e3 100644
--- a/src/common/serialization/vst3/plugin/audio-processor.h
+++ b/src/common/serialization/vst3/plugin/audio-processor.h
@@ -19,6 +19,7 @@
 #include <bitsery/ext/std_optional.h>
 #include <pluginterfaces/vst/ivstaudioprocessor.h>
 
+#include "../../../audio-shm.h"
 #include "../../common.h"
 #include "../base.h"
 #include "../process-data.h"
@@ -175,12 +176,27 @@ class YaAudioProcessor : public Steinberg::Vst::IAudioProcessor {
 
     virtual uint32 PLUGIN_API getLatencySamples() override = 0;
 
+    /**
+     * The response code and written state for a call to
+     * `IAudioProcessor::setupProcessing(setup)`.
+     */
+    struct SetupProcessingResponse {
+        UniversalTResult result;
+        AudioShmBuffer::Config audio_buffers_config;
+
+        template <typename S>
+        void serialize(S& s) {
+            s.object(result);
+            s.object(audio_buffers_config);
+        }
+    };
+
     /**
      * Message to pass through a call to
      * `IAudioProcessor::setupProcessing(setup)` to the Wine plugin host.
      */
     struct SetupProcessing {
-        using Response = UniversalTResult;
+        using Response = SetupProcessingResponse;
 
         native_size_t instance_id;
 
diff --git a/src/plugin/bridges/vst3-impls/plugin-proxy.cpp b/src/plugin/bridges/vst3-impls/plugin-proxy.cpp
index 11f680a3..6fd8f000 100644
--- a/src/plugin/bridges/vst3-impls/plugin-proxy.cpp
+++ b/src/plugin/bridges/vst3-impls/plugin-proxy.cpp
@@ -182,9 +182,11 @@ uint32 PLUGIN_API Vst3PluginProxyImpl::getLatencySamples() {
 
 tresult PLUGIN_API
 Vst3PluginProxyImpl::setupProcessing(Steinberg::Vst::ProcessSetup& setup) {
-    return bridge.send_audio_processor_message(
-        YaAudioProcessor::SetupProcessing{.instance_id = instance_id(),
-                                          .setup = setup});
+    // TOOD: Set up the shared audio buffers next
+    return bridge
+        .send_audio_processor_message(YaAudioProcessor::SetupProcessing{
+            .instance_id = instance_id(), .setup = setup})
+        .result;
 }
 
 tresult PLUGIN_API Vst3PluginProxyImpl::setProcessing(TBool state) {
diff --git a/src/wine-host/bridges/vst3.cpp b/src/wine-host/bridges/vst3.cpp
index ce3be9b9..e7fbb062 100644
--- a/src/wine-host/bridges/vst3.cpp
+++ b/src/wine-host/bridges/vst3.cpp
@@ -1219,8 +1219,15 @@ size_t Vst3Bridge::register_object_instance(
                     },
                     [&](YaAudioProcessor::SetupProcessing& request)
                         -> YaAudioProcessor::SetupProcessing::Response {
-                        return object_instances[request.instance_id]
-                            .audio_processor->setupProcessing(request.setup);
+                        const tresult result =
+                            object_instances[request.instance_id]
+                                .audio_processor->setupProcessing(
+                                    request.setup);
+                        return YaAudioProcessor::SetupProcessingResponse{
+                            .result = result,
+                            // TODO: Send the configuration for the shared audio
+                            //       buffers
+                            .audio_buffers_config{}};
                     },
                     [&](const YaAudioProcessor::SetProcessing& request)
                         -> YaAudioProcessor::SetProcessing::Response {