diff --git a/src/core/hle/service/audio/audin_u.cpp b/src/core/hle/service/audio/audin_u.cpp
index 3e7fd6024c..5705250199 100644
--- a/src/core/hle/service/audio/audin_u.cpp
+++ b/src/core/hle/service/audio/audin_u.cpp
@@ -3,38 +3,65 @@
 // Refer to the license.txt file included.
 
 #include "common/logging/log.h"
+#include "core/core.h"
 #include "core/hle/ipc_helpers.h"
 #include "core/hle/kernel/hle_ipc.h"
+#include "core/hle/kernel/k_event.h"
 #include "core/hle/service/audio/audin_u.h"
 
 namespace Service::Audio {
 
-class IAudioIn final : public ServiceFramework<IAudioIn> {
-public:
-    explicit IAudioIn(Core::System& system_) : ServiceFramework{system_, "IAudioIn"} {
-        // clang-format off
-        static const FunctionInfo functions[] = {
-            {0, nullptr, "GetAudioInState"},
-            {1, nullptr, "Start"},
-            {2, nullptr, "Stop"},
-            {3, nullptr, "AppendAudioInBuffer"},
-            {4, nullptr, "RegisterBufferEvent"},
-            {5, nullptr, "GetReleasedAudioInBuffer"},
-            {6, nullptr, "ContainsAudioInBuffer"},
-            {7, nullptr, "AppendUacInBuffer"},
-            {8, nullptr, "AppendAudioInBufferAuto"},
-            {9, nullptr, "GetReleasedAudioInBuffersAuto"},
-            {10, nullptr, "AppendUacInBufferAuto"},
-            {11, nullptr, "GetAudioInBufferCount"},
-            {12, nullptr, "SetDeviceGain"},
-            {13, nullptr, "GetDeviceGain"},
-            {14, nullptr, "FlushAudioInBuffers"},
-        };
-        // clang-format on
+IAudioIn::IAudioIn(Core::System& system_)
+    : ServiceFramework{system_, "IAudioIn"}, buffer_event{system_.Kernel()} {
+    // clang-format off
+    static const FunctionInfo functions[] = {
+        {0, nullptr, "GetAudioInState"},
+        {1, &IAudioIn::Start, "Start"},
+        {2, nullptr, "Stop"},
+        {3, nullptr, "AppendAudioInBuffer"},
+        {4, &IAudioIn::RegisterBufferEvent, "RegisterBufferEvent"},
+        {5, nullptr, "GetReleasedAudioInBuffer"},
+        {6, nullptr, "ContainsAudioInBuffer"},
+        {7, nullptr, "AppendUacInBuffer"},
+        {8, &IAudioIn::AppendAudioInBufferAuto, "AppendAudioInBufferAuto"},
+        {9, nullptr, "GetReleasedAudioInBuffersAuto"},
+        {10, nullptr, "AppendUacInBufferAuto"},
+        {11, nullptr, "GetAudioInBufferCount"},
+        {12, nullptr, "SetDeviceGain"},
+        {13, nullptr, "GetDeviceGain"},
+        {14, nullptr, "FlushAudioInBuffers"},
+    };
+    // clang-format on
 
-        RegisterHandlers(functions);
-    }
-};
+    RegisterHandlers(functions);
+
+    Kernel::KAutoObject::Create(std::addressof(buffer_event));
+    buffer_event.Initialize("IAudioIn:BufferEvent");
+}
+
+IAudioIn::~IAudioIn() = default;
+
+void IAudioIn::Start(Kernel::HLERequestContext& ctx) {
+    LOG_WARNING(Service_Audio, "(STUBBED) called");
+
+    IPC::ResponseBuilder rb{ctx, 2};
+    rb.Push(ResultSuccess);
+}
+
+void IAudioIn::RegisterBufferEvent(Kernel::HLERequestContext& ctx) {
+    LOG_WARNING(Service_Audio, "(STUBBED) called");
+
+    IPC::ResponseBuilder rb{ctx, 2, 1};
+    rb.Push(ResultSuccess);
+    rb.PushCopyObjects(buffer_event.GetReadableEvent());
+}
+
+void IAudioIn::AppendAudioInBufferAuto(Kernel::HLERequestContext& ctx) {
+    LOG_WARNING(Service_Audio, "(STUBBED) called");
+
+    IPC::ResponseBuilder rb{ctx, 2};
+    rb.Push(ResultSuccess);
+}
 
 AudInU::AudInU(Core::System& system_) : ServiceFramework{system_, "audin:u"} {
     // clang-format off
diff --git a/src/core/hle/service/audio/audin_u.h b/src/core/hle/service/audio/audin_u.h
index 0d75ae5acd..f2f7f99324 100644
--- a/src/core/hle/service/audio/audin_u.h
+++ b/src/core/hle/service/audio/audin_u.h
@@ -4,6 +4,7 @@
 
 #pragma once
 
+#include "core/hle/kernel/k_event.h"
 #include "core/hle/service/service.h"
 
 namespace Core {
@@ -16,6 +17,19 @@ class HLERequestContext;
 
 namespace Service::Audio {
 
+class IAudioIn final : public ServiceFramework<IAudioIn> {
+public:
+    explicit IAudioIn(Core::System& system_);
+    ~IAudioIn() override;
+
+private:
+    void Start(Kernel::HLERequestContext& ctx);
+    void RegisterBufferEvent(Kernel::HLERequestContext& ctx);
+    void AppendAudioInBufferAuto(Kernel::HLERequestContext& ctx);
+
+    Kernel::KEvent buffer_event;
+};
+
 class AudInU final : public ServiceFramework<AudInU> {
 public:
     explicit AudInU(Core::System& system_);