eiz-claude · Oct 3, 2026 · Oct 3, 2026 · Oct 3, 2026
diff --git a/README.md b/README.md
@@ -33,7 +33,7 @@ Discord server at [https://discord.gg/9rwFdMW](https://discord.gg/9rwFdMW).
 
 ## System Requirements
 
-* Windows 7 or later. If you are running a current version of Windows 10, Secure Boot is not supported.
+* Windows 10 or later. Secure Boot is not supported.
 * An audio interface which supports ASIO. If your hardware doesn't come with a
   native ASIO driver, you may be able to use ASIO4ALL instead.
 * Digital audio workstation software. SAR is mainly tested using [REAPER](http://www.reaper.fm/).
@@ -84,12 +84,6 @@ ASIO driver is closed. If you're using REAPER, make sure "Close audio device
 when stopped and application is inactive" in the Audio preferences is
 disabled.
 
-## Windows 7 Installation Note
-
-Make sure you have Windows update [KB3033929](https://technet.microsoft.com/en-us/library/security/3033929.aspx)
-installed prior to installing SAR, otherwise you will receive an error about
-an unsigned driver.
-
 ## Unsigned prereleased drivers note
 
 Prereleases of SAR are unsigned. That means that it is required to enable

diff --git a/SarAsio/sarclient.cpp b/SarAsio/sarclient.cpp
@@ -43,13 +43,6 @@ void SarClient::tick(long bufferIndex)
     if (!_registers)
         return;
 
-    if (_updateSampleRateOnTick.exchange(false)) {
-        DWORD dummy;
-
-        DeviceIoControl(_device, SAR_SEND_FORMAT_CHANGE_EVENT,
-            nullptr, 0, nullptr, 0, &dummy, nullptr);
-    }
-
     // for each endpoint
     // read isActive, generation and buffer offset/size/position
     //   if offset/size invalid, skip endpoint (fill asio buffers with 0)
@@ -187,12 +180,6 @@ bool SarClient::start()
         return false;
     }
 
-    if (!openMmNotificationClient()) {
-        LOG(ERROR) << "Couldn't open MMDevice notification client";
-        stop();
-        return false;
-    }
-
     if (!setBufferLayout()) {
         LOG(ERROR) << "Couldn't set layout";
         stop();
@@ -214,21 +201,6 @@ bool SarClient::start()
 
 void SarClient::stop()
 {
-    if (_mmNotificationClientRegistered) {
-        _mmEnumerator->UnregisterEndpointNotificationCallback(
-            _mmNotificationClient);
-        _mmNotificationClientRegistered = false;
-    }
-
-    if (_mmNotificationClient) {
-        _mmNotificationClient->Release();
-        _mmNotificationClient = nullptr;
-    }
-
-    if (_mmEnumerator) {
-        _mmEnumerator = nullptr;
-    }
-
     if (_device != INVALID_HANDLE_VALUE) {
         _registersLock.lock();
         CancelIoEx(_device, nullptr);
@@ -327,34 +299,6 @@ bool SarClient::openControlDevice()
     return true;
 }
 
-bool SarClient::openMmNotificationClient()
-{
-    if (FAILED(CoCreateInstance(
-        __uuidof(MMDeviceEnumerator), nullptr, CLSCTX_ALL,
-        __uuidof(IMMDeviceEnumerator), (LPVOID *)&_mmEnumerator))) {
-
-        return false;
-    }
-
-    if (FAILED(CComObject<NotificationClient>::CreateInstance(
-        &_mmNotificationClient))) {
-
-        return false;
-    }
-
-    _mmNotificationClient->AddRef();
-    _mmNotificationClient->setClient(shared_from_this());
-
-    if (FAILED(_mmEnumerator->RegisterEndpointNotificationCallback(
-        _mmNotificationClient))) {
-
-        return false;
-    }
-
-    _mmNotificationClientRegistered = true;
-    return true;
-}
-
 bool SarClient::setBufferLayout()
 {
     SarSetBufferLayoutRequest request = {};
@@ -580,89 +524,4 @@ void SarClient::mux(
     }
 }
 
-HRESULT STDMETHODCALLTYPE SarClient::NotificationClient::OnDeviceStateChanged(
-    _In_  LPCWSTR pwstrDeviceId,
-    _In_  DWORD dwNewState)
-{
-    // When a SAR endpoint is re-activated after its initial creation, its
-    // supported sample rate may be different. To force the audio engine to
-    // notice the possible format change, we listen for device state change
-    // events and tell the kernel mode driver to broadcast a
-    // KSEVENT_PINCAPS_FORMATCHANGE event, which causes the audio engine to
-    // re-query the pin capabilities. This isn't needed for newly added
-    // endpoints or non-SAR endpoints, so we filter out those events.
-    if (dwNewState != DEVICE_STATE_ACTIVE) {
-        return S_OK;
-    }
-
-    if (auto client = _client.lock()) {
-        do {
-            CComPtr<IMMDeviceEnumerator> mmEnumerator;
-            CComPtr<IMMDevice> device;
-            CComPtr<IPropertyStore> ps;
-            PROPVARIANT pvalue = {};
-
-            // This seems a bit shady, but MSDN's device events example
-            // initializes COM the same way. It's not clear what the ownership
-            // of the thread that delivers the IMMNotificationClient events is.
-            CoInitialize(NULL);
-
-            if (FAILED(CoCreateInstance(
-                __uuidof(MMDeviceEnumerator), nullptr, CLSCTX_ALL,
-                __uuidof(IMMDeviceEnumerator), (LPVOID *)&mmEnumerator))) {
-
-                break;
-            }
-
-            if (FAILED(mmEnumerator->GetDevice(pwstrDeviceId, &device))) {
-                break;
-            }
-
-            if (FAILED(device->OpenPropertyStore(STGM_READ, &ps))) {
-                break;
-            }
-
-            if (FAILED(ps->GetValue(
-                PKEY_SynchronousAudioRouter_EndpointId, &pvalue))) {
-
-                break;
-            }
-
-            client->updateSampleRateOnTick();
-            PropVariantClear(&pvalue);
-        } while(false);
-
-        CoUninitialize();
-    }
-
-    return S_OK;
-}
-
-HRESULT STDMETHODCALLTYPE SarClient::NotificationClient::OnDeviceAdded(
-    _In_  LPCWSTR pwstrDeviceId)
-{
-    return S_OK;
-}
-
-HRESULT STDMETHODCALLTYPE SarClient::NotificationClient::OnDeviceRemoved(
-    _In_  LPCWSTR pwstrDeviceId)
-{
-    return S_OK;
-}
-
-HRESULT STDMETHODCALLTYPE SarClient::NotificationClient::OnDefaultDeviceChanged(
-    _In_  EDataFlow flow,
-    _In_  ERole role,
-    _In_  LPCWSTR pwstrDefaultDeviceId)
-{
-    return S_OK;
-}
-
-HRESULT STDMETHODCALLTYPE SarClient::NotificationClient::OnPropertyValueChanged(
-    _In_  LPCWSTR pwstrDeviceId,
-    _In_  const PROPERTYKEY key)
-{
-    return S_OK;
-}
-
 } // namespace Sar
diff --git a/SarAsio/sarclient.h b/SarAsio/sarclient.h
@@ -39,10 +39,6 @@ struct SarClient: public std::enable_shared_from_this<SarClient>
     void tick(long bufferIndex);
     bool start();
     void stop();
-    void updateSampleRateOnTick()
-    {
-        _updateSampleRateOnTick = true;
-    }
 
 private:
     struct NotificationHandle
@@ -64,42 +60,7 @@ struct SarClient: public std::enable_shared_from_this<SarClient>
         SarHandleQueueResponse responses[32];
     };
 
-    struct ATL_NO_VTABLE NotificationClient:
-        public CComObjectRootEx<CComMultiThreadModel>,
-        public IMMNotificationClient
-    {
-        BEGIN_COM_MAP(NotificationClient)
-            COM_INTERFACE_ENTRY(IMMNotificationClient)
-        END_COM_MAP()
-
-        DECLARE_NO_REGISTRY()
-
-        void setClient(std::weak_ptr<SarClient> client)
-        {
-            _client = client;
-        }
-
-        virtual HRESULT STDMETHODCALLTYPE OnDeviceStateChanged(
-            _In_  LPCWSTR pwstrDeviceId,
-            _In_  DWORD dwNewState) override;
-        virtual HRESULT STDMETHODCALLTYPE OnDeviceAdded(
-            _In_  LPCWSTR pwstrDeviceId) override;
-        virtual HRESULT STDMETHODCALLTYPE OnDeviceRemoved(
-            _In_  LPCWSTR pwstrDeviceId) override;
-        virtual HRESULT STDMETHODCALLTYPE OnDefaultDeviceChanged(
-            _In_  EDataFlow flow,
-            _In_  ERole role,
-            _In_  LPCWSTR pwstrDefaultDeviceId) override;
-        virtual HRESULT STDMETHODCALLTYPE OnPropertyValueChanged(
-            _In_  LPCWSTR pwstrDeviceId,
-            _In_  const PROPERTYKEY key) override;
-
-    private:
-        std::weak_ptr<SarClient> _client;
-    };
-
     bool openControlDevice();
-    bool openMmNotificationClient();
     bool setBufferLayout();
     bool createEndpoints();
     bool enableRegistryFilter();
@@ -127,10 +88,6 @@ struct SarClient: public std::enable_shared_from_this<SarClient>
     volatile SarEndpointRegisters *_registers;
     HandleQueueCompletion _handleQueueCompletion;
     bool _handleQueueStarted;
-    CComPtr<IMMDeviceEnumerator> _mmEnumerator;
-    CComObject<NotificationClient> *_mmNotificationClient = nullptr;
-    bool _mmNotificationClientRegistered = false;
-    std::atomic<bool> _updateSampleRateOnTick = false;
     std::mutex _registersLock;
 };
 

diff --git a/SarAsio/targetver.h b/SarAsio/targetver.h
@@ -6,6 +6,6 @@
 // set the _WIN32_WINNT macro to the platform you wish to support before including SDKDDKVer.h.
 #include <winsdkver.h>
 
-#define _WIN32_WINNT 0x0601
+#define _WIN32_WINNT 0x0A00 // Windows 10
 
 #include <SDKDDKVer.h>
diff --git a/SarConfigure/SarConfigure.cpp b/SarConfigure/SarConfigure.cpp
@@ -59,89 +59,21 @@ static int openConfigurationDialog(Sar::AsioDriver& driver) {
     }
 }
 
-static bool broadcastPinFormatChange() {
-    HDEVINFO devinfo;
-    SP_DEVICE_INTERFACE_DATA interfaceData;
-    PSP_DEVICE_INTERFACE_DETAIL_DATA interfaceDetail;
-    DWORD requiredSize;
-    HANDLE _device;
-    DWORD dummy;
-
-    interfaceData.cbSize = sizeof(SP_DEVICE_INTERFACE_DATA);
-    devinfo = SetupDiGetClassDevs(
-        &GUID_DEVINTERFACE_SYNCHRONOUSAUDIOROUTER, nullptr, nullptr,
-        DIGCF_DEVICEINTERFACE | DIGCF_PRESENT);
-
-    if (devinfo == INVALID_HANDLE_VALUE) {
-        return false;
-    }
-
-    if (!SetupDiEnumDeviceInterfaces(devinfo, NULL,
-        &GUID_DEVINTERFACE_SYNCHRONOUSAUDIOROUTER, 0, &interfaceData)) {
-
-        return false;
-    }
-
-    SetLastError(0);
-    SetupDiGetDeviceInterfaceDetail(
-        devinfo, &interfaceData, nullptr, 0, &requiredSize, nullptr);
-
-    if (GetLastError() != ERROR_INSUFFICIENT_BUFFER) {
-        return false;
-    }
-
-    interfaceDetail = (PSP_DEVICE_INTERFACE_DETAIL_DATA)malloc(requiredSize);
-    interfaceDetail->cbSize = sizeof(SP_DEVICE_INTERFACE_DETAIL_DATA);
-
-    if (!SetupDiGetDeviceInterfaceDetail(
-        devinfo, &interfaceData, interfaceDetail,
-        requiredSize, nullptr, nullptr)) {
-
-        free(interfaceDetail);
-        return false;
-    }
-
-    _device = CreateFile(interfaceDetail->DevicePath,
-        GENERIC_ALL, 0, nullptr, OPEN_EXISTING,
-        FILE_ATTRIBUTE_NORMAL | FILE_FLAG_OVERLAPPED, nullptr);
-
-    if (_device == INVALID_HANDLE_VALUE) {
-        free(interfaceDetail);
-        return false;
-    }
-
-    free(interfaceDetail);
-
-    DeviceIoControl(_device, SAR_SEND_FORMAT_CHANGE_EVENT,
-        nullptr, 0, nullptr, 0, &dummy, nullptr);
-    printf("Sent SAR_SEND_FORMAT_CHANGE_EVENT\n");
-
-    CloseHandle(_device);
-
-    return true;
-}
-
 int main(int argc, char *argv[])
 {
+    CoInitialize(NULL);
 
-    if (argc >= 2 && !strcmp(argv[1], "-u")) {
-        broadcastPinFormatChange();
-    }
-    else {
-        CoInitialize(NULL);
-
-        std::vector<Sar::AsioDriver> asioDrivers = Sar::InstalledAsioDrivers();
+    std::vector<Sar::AsioDriver> asioDrivers = Sar::InstalledAsioDrivers();
 
-        printf("\n");
-        for (size_t i = 0; i < asioDrivers.size(); i++) {
-            printf("Checking driver: %s == %s\n", asioDrivers[i].clsid.c_str(), CLSID_STR_SynchronousAudioRouter);
-            if (asioDrivers[i].clsid == CLSID_STR_SynchronousAudioRouter) {
-                Sar::AsioDriver& driver = asioDrivers[i];
-                printf("Found SAR ASIO driver: %s\n", driver.name.c_str());
-                return openConfigurationDialog(driver);
-            }
+    printf("\n");
+    for (size_t i = 0; i < asioDrivers.size(); i++) {
+        printf("Checking driver: %s == %s\n", asioDrivers[i].clsid.c_str(), CLSID_STR_SynchronousAudioRouter);
+        if (asioDrivers[i].clsid == CLSID_STR_SynchronousAudioRouter) {
+            Sar::AsioDriver& driver = asioDrivers[i];
+            printf("Found SAR ASIO driver: %s\n", driver.name.c_str());
+            return openConfigurationDialog(driver);
         }
-
-        CoUninitialize();
     }
+
+    CoUninitialize();
 }
diff --git a/SarInstallerActions/targetver.h b/SarInstallerActions/targetver.h
@@ -2,6 +2,6 @@
 
 #include <winsdkver.h>
 
-#define _WIN32_WINNT 0x0601
+#define _WIN32_WINNT 0x0A00 // Windows 10
 
 #include <sdkddkver.h>
diff --git a/SarTest/SarTest.cpp b/SarTest/SarTest.cpp
@@ -79,6 +79,8 @@ int usage()
         "Other options:  --results <file.json> --phase-timeout S --no-sarasio-log\n"
         "                --keep-config (host/run: do not rewrite default.json)\n"
         "                --app-routing (turn on application routing in default.json)\n"
+        "                --expect-format (fail streams whose engine format isn't --rate\n"
+        "                and --channels)\n"
         "                --registered (use the COM-registered SarAsio instead of a path)\n"
         "                --wait S --wait-gone S --restart-delay MS --rate HZ\n"
         "                --min-valid RATIO --max-discontinuities N\n"
@@ -132,6 +134,12 @@ WasapiOptions wasapiOptions(const Args& args, const EndpointLayout& layout)
     options.settleSeconds = args.getDouble(L"settle", 2.0);
     options.maxReopens = args.getInt(L"max-reopens", 20);
     options.maxTransitionFrames = args.getInt(L"max-transition", 4800);
+
+    if (args.has(L"expect-format")) {
+        options.expectedRate = (unsigned long)args.getDouble(L"rate", 48000.0);
+        options.expectedChannels = layout.channels;
+    }
+
     return options;
 }