diff --git a/configure b/configure
index cf5dc786cc7..5b5000d8517 100755
--- a/configure
+++ b/configure
@@ -1374,6 +1374,7 @@ enable_xapofx1_1
 enable_xapofx1_3
 enable_xapofx1_4
 enable_xapofx1_5
+enable_xaudio2_2
 enable_xaudio2_3
 enable_xaudio2_4
 enable_xaudio2_5
@@ -17915,6 +17916,7 @@ wine_fn_config_dll xapofx1_1 enable_xapofx1_1
 wine_fn_config_dll xapofx1_3 enable_xapofx1_3
 wine_fn_config_dll xapofx1_4 enable_xapofx1_4
 wine_fn_config_dll xapofx1_5 enable_xapofx1_5
+wine_fn_config_dll xaudio2_2 enable_xaudio2_2 clean
 wine_fn_config_dll xaudio2_3 enable_xaudio2_3 clean
 wine_fn_config_dll xaudio2_4 enable_xaudio2_4 clean
 wine_fn_config_dll xaudio2_5 enable_xaudio2_5 clean
diff --git a/configure.ac b/configure.ac
index bd98b6c5c25..51574dbf4d9 100644
--- a/configure.ac
+++ b/configure.ac
@@ -3460,6 +3460,7 @@ WINE_CONFIG_DLL(xapofx1_1)
 WINE_CONFIG_DLL(xapofx1_3)
 WINE_CONFIG_DLL(xapofx1_4)
 WINE_CONFIG_DLL(xapofx1_5)
+WINE_CONFIG_DLL(xaudio2_2,,[clean])
 WINE_CONFIG_DLL(xaudio2_3,,[clean])
 WINE_CONFIG_DLL(xaudio2_4,,[clean])
 WINE_CONFIG_DLL(xaudio2_5,,[clean])
diff --git a/dlls/xaudio2_2/Makefile.in b/dlls/xaudio2_2/Makefile.in
new file mode 100644
index 00000000000..94701995a4c
--- /dev/null
+++ b/dlls/xaudio2_2/Makefile.in
@@ -0,0 +1,7 @@
+MODULE    = xaudio2_2.dll
+IMPORTS   = ole32
+
+C_SRCS = \
+	xaudio_dll.c
+
+IDL_SRCS = xaudio_classes.idl
diff --git a/dlls/xaudio2_2/xaudio2_2.spec b/dlls/xaudio2_2/xaudio2_2.spec
new file mode 100644
index 00000000000..cb263d4836b
--- /dev/null
+++ b/dlls/xaudio2_2/xaudio2_2.spec
@@ -0,0 +1,4 @@
+@ stdcall -private DllCanUnloadNow()
+@ stdcall -private DllGetClassObject(ptr ptr ptr) xaudio2_7.DllGetClassObject
+@ stdcall -private DllRegisterServer()
+@ stdcall -private DllUnregisterServer()
diff --git a/dlls/xaudio2_2/xaudio_classes.idl b/dlls/xaudio2_2/xaudio_classes.idl
new file mode 100644
index 00000000000..6ff0a0089e2
--- /dev/null
+++ b/dlls/xaudio2_2/xaudio_classes.idl
@@ -0,0 +1,28 @@
+/*
+ * COM Classes for xaudio
+ *
+ * Copyright 2015 Andrew Eikum for CodeWeavers
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
+ */
+
+#pragma makedep register
+
+[
+    helpstring("XAudio2.2 Class"),
+    threading(both),
+    uuid(b802058a-464a-42db-bc10-b650d6f2586a)
+]
+coclass XAudio22 { interface IXAudio22; }
diff --git a/dlls/xaudio2_2/xaudio_dll.c b/dlls/xaudio2_2/xaudio_dll.c
new file mode 100644
index 00000000000..7c95c288ca0
--- /dev/null
+++ b/dlls/xaudio2_2/xaudio_dll.c
@@ -0,0 +1,52 @@
+/*
+ * Copyright (c) 2015 Andrew Eikum for CodeWeavers
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
+ */
+
+#include <stdarg.h>
+#include "windef.h"
+#include "winbase.h"
+#include "objbase.h"
+#include "rpcproxy.h"
+
+static HINSTANCE instance;
+
+BOOL WINAPI DllMain(HINSTANCE hinstance, DWORD reason, LPVOID reserved)
+{
+    switch (reason)
+    {
+    case DLL_PROCESS_ATTACH:
+        instance = hinstance;
+        DisableThreadLibraryCalls(hinstance);
+        break;
+    }
+    return TRUE;
+}
+
+HRESULT WINAPI DllCanUnloadNow(void)
+{
+    return S_FALSE;
+}
+
+HRESULT WINAPI DllRegisterServer(void)
+{
+    return __wine_register_resources(instance);
+}
+
+HRESULT WINAPI DllUnregisterServer(void)
+{
+    return __wine_unregister_resources(instance);
+}
diff --git a/dlls/xaudio2_7/compat.c b/dlls/xaudio2_7/compat.c
index 114463a8740..bee57c6e2a7 100644
--- a/dlls/xaudio2_7/compat.c
+++ b/dlls/xaudio2_7/compat.c
@@ -1183,3 +1183,255 @@ const IXAudio23MasteringVoiceVtbl XAudio23MasteringVoice_Vtbl = {
     XA23M_GetOutputMatrix,
     XA23M_DestroyVoice
 };
+
+static inline IXAudio2Impl *impl_from_IXAudio22(IXAudio22 *iface)
+{
+    return CONTAINING_RECORD(iface, IXAudio2Impl, IXAudio22_iface);
+}
+
+static HRESULT WINAPI XA22_QueryInterface(IXAudio22 *iface, REFIID riid,
+        void **ppvObject)
+{
+    IXAudio2Impl *This = impl_from_IXAudio22(iface);
+    return IXAudio2_QueryInterface(&This->IXAudio2_iface, riid, ppvObject);
+}
+
+static ULONG WINAPI XA22_AddRef(IXAudio22 *iface)
+{
+    IXAudio2Impl *This = impl_from_IXAudio22(iface);
+    return IXAudio2_AddRef(&This->IXAudio2_iface);
+}
+
+static ULONG WINAPI XA22_Release(IXAudio22 *iface)
+{
+    IXAudio2Impl *This = impl_from_IXAudio22(iface);
+    return IXAudio2_Release(&This->IXAudio2_iface);
+}
+
+static HRESULT WINAPI XA22_GetDeviceCount(IXAudio22 *iface, UINT32 *pCount)
+{
+    IXAudio2Impl *This = impl_from_IXAudio22(iface);
+
+    TRACE("%p, %p\n", This, pCount);
+
+    *pCount = This->ndevs;
+
+    return S_OK;
+}
+
+static HRESULT WINAPI XA22_GetDeviceDetails(IXAudio22 *iface, UINT32 index,
+        XAUDIO2_DEVICE_DETAILS *pDeviceDetails)
+{
+    IXAudio2Impl *This = impl_from_IXAudio22(iface);
+    HRESULT hr;
+    IMMDevice *dev;
+    IAudioClient *client;
+    IPropertyStore *ps;
+    WAVEFORMATEX *wfx;
+    PROPVARIANT var;
+
+    TRACE("%p, %u, %p\n", This, index, pDeviceDetails);
+
+    if(index >= This->ndevs)
+        return E_INVALIDARG;
+
+    hr = IMMDeviceEnumerator_GetDevice(This->devenum, This->devids[index], &dev);
+    if(FAILED(hr)){
+        WARN("GetDevice failed: %08x\n", hr);
+        return hr;
+    }
+
+    hr = IMMDevice_Activate(dev, &IID_IAudioClient, CLSCTX_INPROC_SERVER,
+            NULL, (void**)&client);
+    if(FAILED(hr)){
+        WARN("Activate failed: %08x\n", hr);
+        IMMDevice_Release(dev);
+        return hr;
+    }
+
+    hr = IMMDevice_OpenPropertyStore(dev, STGM_READ, &ps);
+    if(FAILED(hr)){
+        WARN("OpenPropertyStore failed: %08x\n", hr);
+        IAudioClient_Release(client);
+        IMMDevice_Release(dev);
+        return hr;
+    }
+
+    PropVariantInit(&var);
+
+    hr = IPropertyStore_GetValue(ps, (PROPERTYKEY*)&DEVPKEY_Device_FriendlyName, &var);
+    if(FAILED(hr)){
+        WARN("GetValue failed: %08x\n", hr);
+        goto done;
+    }
+
+    lstrcpynW(pDeviceDetails->DisplayName, var.u.pwszVal, sizeof(pDeviceDetails->DisplayName)/sizeof(WCHAR));
+
+    PropVariantClear(&var);
+
+    hr = IAudioClient_GetMixFormat(client, &wfx);
+    if(FAILED(hr)){
+        WARN("GetMixFormat failed: %08x\n", hr);
+        goto done;
+    }
+
+    lstrcpyW(pDeviceDetails->DeviceID, This->devids[index]);
+
+    if(index == 0)
+        pDeviceDetails->Role = GlobalDefaultDevice;
+    else
+        pDeviceDetails->Role = NotDefaultDevice;
+
+    if(sizeof(WAVEFORMATEX) + wfx->cbSize > sizeof(pDeviceDetails->OutputFormat)){
+        FIXME("AudioClient format is too large to fit into WAVEFORMATEXTENSIBLE!\n");
+        CoTaskMemFree(wfx);
+        hr = E_FAIL;
+        goto done;
+    }
+    memcpy(&pDeviceDetails->OutputFormat, wfx, sizeof(WAVEFORMATEX) + wfx->cbSize);
+
+    CoTaskMemFree(wfx);
+
+done:
+    IPropertyStore_Release(ps);
+    IAudioClient_Release(client);
+    IMMDevice_Release(dev);
+
+    return hr;
+}
+
+static HRESULT WINAPI XA22_Initialize(IXAudio22 *iface, UINT32 flags,
+        XAUDIO2_PROCESSOR processor)
+{
+    IXAudio2Impl *This = impl_from_IXAudio22(iface);
+    TRACE("(%p)->(0x%x, 0x%x)\n", This, flags, processor);
+    return S_OK;
+}
+
+static HRESULT WINAPI XA22_RegisterForCallbacks(IXAudio22 *iface,
+        IXAudio2EngineCallback *pCallback)
+{
+    IXAudio2Impl *This = impl_from_IXAudio22(iface);
+    return IXAudio2_RegisterForCallbacks(&This->IXAudio2_iface, pCallback);
+}
+
+static void WINAPI XA22_UnregisterForCallbacks(IXAudio22 *iface,
+        IXAudio2EngineCallback *pCallback)
+{
+    IXAudio2Impl *This = impl_from_IXAudio22(iface);
+    IXAudio2_UnregisterForCallbacks(&This->IXAudio2_iface, pCallback);
+}
+
+static HRESULT WINAPI XA22_CreateSourceVoice(IXAudio22 *iface,
+        IXAudio2SourceVoice **ppSourceVoice, const WAVEFORMATEX *pSourceFormat,
+        UINT32 flags, float maxFrequencyRatio,
+        IXAudio2VoiceCallback *pCallback, const XAUDIO2_VOICE_SENDS *pSendList,
+        const XAUDIO2_EFFECT_CHAIN *pEffectChain)
+{
+    IXAudio2Impl *This = impl_from_IXAudio22(iface);
+    return IXAudio2_CreateSourceVoice(&This->IXAudio2_iface, ppSourceVoice,
+            pSourceFormat, flags, maxFrequencyRatio, pCallback, pSendList,
+            pEffectChain);
+}
+
+static HRESULT WINAPI XA22_CreateSubmixVoice(IXAudio22 *iface,
+        IXAudio2SubmixVoice **ppSubmixVoice, UINT32 inputChannels,
+        UINT32 inputSampleRate, UINT32 flags, UINT32 processingStage,
+        const XAUDIO2_VOICE_SENDS *pSendList,
+        const XAUDIO2_EFFECT_CHAIN *pEffectChain)
+{
+    IXAudio2Impl *This = impl_from_IXAudio22(iface);
+    return IXAudio2_CreateSubmixVoice(&This->IXAudio2_iface, ppSubmixVoice,
+            inputChannels, inputSampleRate, flags, processingStage, pSendList,
+            pEffectChain);
+}
+
+static HRESULT WINAPI XA22_CreateMasteringVoice(IXAudio22 *iface,
+        IXAudio2MasteringVoice **ppMasteringVoice, UINT32 inputChannels,
+        UINT32 inputSampleRate, UINT32 flags, UINT32 deviceIndex,
+        const XAUDIO2_EFFECT_CHAIN *pEffectChain)
+{
+    IXAudio2Impl *This = impl_from_IXAudio22(iface);
+
+    TRACE("(%p)->(%p, %u, %u, 0x%x, %u, %p)\n", This, ppMasteringVoice,
+            inputChannels, inputSampleRate, flags, deviceIndex,
+            pEffectChain);
+
+    if(deviceIndex >= This->ndevs)
+        return E_INVALIDARG;
+
+    return IXAudio2_CreateMasteringVoice(&This->IXAudio2_iface, ppMasteringVoice,
+            inputChannels, inputSampleRate, flags, This->devids[deviceIndex],
+            pEffectChain, AudioCategory_GameEffects);
+}
+
+static HRESULT WINAPI XA22_StartEngine(IXAudio22 *iface)
+{
+    IXAudio2Impl *This = impl_from_IXAudio22(iface);
+    return IXAudio2_StartEngine(&This->IXAudio2_iface);
+}
+
+static void WINAPI XA22_StopEngine(IXAudio22 *iface)
+{
+    IXAudio2Impl *This = impl_from_IXAudio22(iface);
+    return IXAudio2_StopEngine(&This->IXAudio2_iface);
+}
+
+static HRESULT WINAPI XA22_CommitChanges(IXAudio22 *iface, UINT32 operationSet)
+{
+    IXAudio2Impl *This = impl_from_IXAudio22(iface);
+    return IXAudio2_CommitChanges(&This->IXAudio2_iface, operationSet);
+}
+
+static void WINAPI XA22_GetPerformanceData(IXAudio22 *iface,
+        XAUDIO22_PERFORMANCE_DATA *pPerfData)
+{
+    IXAudio2Impl *This = impl_from_IXAudio22(iface);
+    XAUDIO2_PERFORMANCE_DATA data;
+
+    IXAudio2_GetPerformanceData(&This->IXAudio2_iface, &data);
+
+    pPerfData->AudioCyclesSinceLastQuery = data.AudioCyclesSinceLastQuery;
+    pPerfData->TotalCyclesSinceLastQuery = data.TotalCyclesSinceLastQuery;
+    pPerfData->MinimumCyclesPerQuantum = data.MinimumCyclesPerQuantum;
+    pPerfData->MaximumCyclesPerQuantum = data.MaximumCyclesPerQuantum;
+    pPerfData->MemoryUsageInBytes = data.MemoryUsageInBytes;
+    pPerfData->CurrentLatencyInSamples = data.CurrentLatencyInSamples;
+    pPerfData->GlitchesSinceEngineStarted = data.GlitchesSinceEngineStarted;
+    pPerfData->ActiveSourceVoiceCount = data.ActiveSourceVoiceCount;
+    pPerfData->TotalSourceVoiceCount = data.TotalSourceVoiceCount;
+
+    pPerfData->ActiveSubmixVoiceCount = data.ActiveSubmixVoiceCount;
+    pPerfData->TotalSubmixVoiceCount = data.ActiveSubmixVoiceCount;
+
+    pPerfData->ActiveXmaSourceVoices = data.ActiveXmaSourceVoices;
+    pPerfData->ActiveXmaStreams = data.ActiveXmaStreams;
+}
+
+static void WINAPI XA22_SetDebugConfiguration(IXAudio22 *iface,
+        const XAUDIO2_DEBUG_CONFIGURATION *pDebugConfiguration,
+        void *pReserved)
+{
+    IXAudio2Impl *This = impl_from_IXAudio22(iface);
+    return IXAudio2_SetDebugConfiguration(&This->IXAudio2_iface,
+            pDebugConfiguration, pReserved);
+}
+
+const IXAudio22Vtbl XAudio22_Vtbl = {
+    XA22_QueryInterface,
+    XA22_AddRef,
+    XA22_Release,
+    XA22_GetDeviceCount,
+    XA22_GetDeviceDetails,
+    XA22_Initialize,
+    XA22_RegisterForCallbacks,
+    XA22_UnregisterForCallbacks,
+    XA22_CreateSourceVoice,
+    XA22_CreateSubmixVoice,
+    XA22_CreateMasteringVoice,
+    XA22_StartEngine,
+    XA22_StopEngine,
+    XA22_CommitChanges,
+    XA22_GetPerformanceData,
+    XA22_SetDebugConfiguration
+};
diff --git a/dlls/xaudio2_7/xaudio_classes.idl b/dlls/xaudio2_7/xaudio_classes.idl
index a1ed611e7fe..7be37fdb1e2 100644
--- a/dlls/xaudio2_7/xaudio_classes.idl
+++ b/dlls/xaudio2_7/xaudio_classes.idl
@@ -40,3 +40,10 @@ coclass AudioVolumeMeter { interface IUnknown; }
     uuid(6a93130e-1d53-41d1-a9cf-e758800bb179)
 ]
 coclass AudioReverb { interface IUnknown; }
+
+[
+    helpstring("XACT 31 Class"),
+    threading(both),
+    uuid(962f5027-99be-4692-a468-85802cf8de61)
+]
+coclass XACT31 { interface IUnknown; }
diff --git a/dlls/xaudio2_7/xaudio_dll.c b/dlls/xaudio2_7/xaudio_dll.c
index 5453d25b98e..68fe955aee0 100644
--- a/dlls/xaudio2_7/xaudio_dll.c
+++ b/dlls/xaudio2_7/xaudio_dll.c
@@ -1175,9 +1175,13 @@ static HRESULT WINAPI IXAudio2Impl_QueryInterface(IXAudio2 *iface, REFIID riid,
     if(IsEqualGUID(riid, &IID_IUnknown) ||
             IsEqualGUID(riid, &IID_IXAudio2))
         *ppvObject = &This->IXAudio2_iface;
-    else if(IsEqualGUID(riid, &IID_IXAudio27))
-        *ppvObject = &This->IXAudio27_iface;
-    else
+    else if(IsEqualGUID(riid, &IID_IXAudio27)){
+        /* all xaudio versions before 28 share an IID */
+        if(This->version == 21 || This->version == 22)
+            *ppvObject = &This->IXAudio22_iface;
+        else
+            *ppvObject = &This->IXAudio27_iface;
+    }else
         *ppvObject = NULL;
 
     if(*ppvObject){
@@ -2304,6 +2308,7 @@ static HRESULT WINAPI XAudio2CF_CreateInstance(IClassFactory *iface, IUnknown *p
     if(!object)
         return E_OUTOFMEMORY;
 
+    object->IXAudio22_iface.lpVtbl = &XAudio22_Vtbl;
     object->IXAudio27_iface.lpVtbl = &XAudio27_Vtbl;
     object->IXAudio2_iface.lpVtbl = &XAudio2_Vtbl;
     object->IXAudio23MasteringVoice_iface.lpVtbl = &XAudio23MasteringVoice_Vtbl;
@@ -2460,7 +2465,11 @@ HRESULT WINAPI DllGetClassObject(REFCLSID rclsid, REFIID riid, void **ppv)
 
     TRACE("(%s, %s, %p)\n", debugstr_guid(rclsid), debugstr_guid(riid), ppv);
 
-    if IsEqualGUID(rclsid, &CLSID_XAudio23){
+    if IsEqualGUID(rclsid, &CLSID_XAudio21){
+        factory = make_xaudio2_factory(21);
+    }else if IsEqualGUID(rclsid, &CLSID_XAudio22){
+        factory = make_xaudio2_factory(22);
+    }else if IsEqualGUID(rclsid, &CLSID_XAudio23){
         factory = make_xaudio2_factory(23);
     }else if(IsEqualGUID(rclsid, &CLSID_XAudio24)){
         factory = make_xaudio2_factory(24);
diff --git a/dlls/xaudio2_7/xaudio_private.h b/dlls/xaudio2_7/xaudio_private.h
index 5a0fcdfe9ae..91966ca6eb2 100644
--- a/dlls/xaudio2_7/xaudio_private.h
+++ b/dlls/xaudio2_7/xaudio_private.h
@@ -92,6 +92,7 @@ typedef struct _XA2SubmixImpl {
 } XA2SubmixImpl;
 
 struct _IXAudio2Impl {
+    IXAudio22 IXAudio22_iface;
     IXAudio27 IXAudio27_iface;
     IXAudio2 IXAudio2_iface;
     IXAudio23MasteringVoice IXAudio23MasteringVoice_iface;
@@ -136,3 +137,5 @@ extern const IXAudio27Vtbl XAudio27_Vtbl DECLSPEC_HIDDEN;
 extern const IXAudio23SourceVoiceVtbl XAudio23SourceVoice_Vtbl DECLSPEC_HIDDEN;
 extern const IXAudio23SubmixVoiceVtbl XAudio23SubmixVoice_Vtbl DECLSPEC_HIDDEN;
 extern const IXAudio23MasteringVoiceVtbl XAudio23MasteringVoice_Vtbl DECLSPEC_HIDDEN;
+
+extern const IXAudio22Vtbl XAudio22_Vtbl DECLSPEC_HIDDEN;
diff --git a/include/xaudio2.idl b/include/xaudio2.idl
index 5de66223fd9..bd79718806f 100644
--- a/include/xaudio2.idl
+++ b/include/xaudio2.idl
@@ -30,6 +30,13 @@ coclass XAudio2 {
     interface IUnknown;
 }
 
+[
+    uuid(b802058a-464a-42db-bc10-b650d6f2586a)
+]
+coclass XAudio22 {
+    interface IUnknown;
+}
+
 [
     uuid(4c5e637a-16c7-4de3-9c46-5ed22181962d)
 ]
@@ -149,6 +156,23 @@ typedef struct XAUDIO2_PERFORMANCE_DATA
     UINT32 ActiveXmaStreams;
 } XAUDIO2_PERFORMANCE_DATA;
 
+typedef struct XAUDIO22_PERFORMANCE_DATA
+{
+    UINT64 AudioCyclesSinceLastQuery;
+    UINT64 TotalCyclesSinceLastQuery;
+    UINT32 MinimumCyclesPerQuantum;
+    UINT32 MaximumCyclesPerQuantum;
+    UINT32 MemoryUsageInBytes;
+    UINT32 CurrentLatencyInSamples;
+    UINT32 GlitchesSinceEngineStarted;
+    UINT32 ActiveSourceVoiceCount;
+    UINT32 TotalSourceVoiceCount;
+    UINT32 ActiveSubmixVoiceCount;
+    UINT32 TotalSubmixVoiceCount;
+    UINT32 ActiveXmaSourceVoices;
+    UINT32 ActiveXmaStreams;
+} XAUDIO22_PERFORMANCE_DATA;
+
 typedef enum XAUDIO2_DEVICE_ROLE
 {
     NotDefaultDevice            = 0x0,
@@ -610,6 +634,67 @@ typedef struct XAUDIO2_DEBUG_CONFIGURATION
     BOOL LogTiming;
 } XAUDIO2_DEBUG_CONFIGURATION;
 
+[
+    object,
+    uuid(8bcf1f58-9fe7-4583-8ac6-e2adc465c8bb), /* all versions before 28 share IID_IXAudio */
+]
+/* XAudio2 2.2's IXAudio2 interface. Actually called IXAudio2 in the Jun 2010
+ * DX SDK */
+interface IXAudio22 : IUnknown
+{
+    HRESULT GetDeviceCount([out] UINT32* pCount);
+
+    HRESULT GetDeviceDetails(
+        [in] UINT32 Index,
+        [out] XAUDIO2_DEVICE_DETAILS* pDeviceDetails);
+
+    HRESULT Initialize(
+        [in, defaultvalue(0)] UINT32 Flags,
+        [in, defaultvalue(XAUDIO2_DEFAULT_PROCESSOR)] XAUDIO2_PROCESSOR XAudio2Processor);
+
+    HRESULT RegisterForCallbacks([in] IXAudio2EngineCallback* pCallback);
+
+    void UnregisterForCallbacks([in] IXAudio2EngineCallback* pCallback);
+
+    HRESULT CreateSourceVoice(
+        [out] IXAudio2SourceVoice** ppSourceVoice,
+        [in] const WAVEFORMATEX* pSourceFormat,
+        [in, defaultvalue(0)] UINT32 Flags,
+        [in, defaultvalue(XAUDIO2_DEFAULT_FREQ_RATIO)] float MaxFrequencyRatio,
+        [in, defaultvalue(NULL)] IXAudio2VoiceCallback* pCallback,
+        [in, defaultvalue(NULL)] const XAUDIO2_VOICE_SENDS* pSendList,
+        [in, defaultvalue(NULL)] const XAUDIO2_EFFECT_CHAIN* pEffectChain);
+
+    HRESULT CreateSubmixVoice(
+        [out] IXAudio2SubmixVoice** ppSubmixVoice,
+        [in] UINT32 InputChannels,
+        [in] UINT32 InputSampleRate,
+        [in, defaultvalue(0)] UINT32 Flags,
+        [in, defaultvalue(0)] UINT32 ProcessingStage,
+        [in, defaultvalue(NULL)] const XAUDIO2_VOICE_SENDS* pSendList,
+        [in, defaultvalue(NULL)] const XAUDIO2_EFFECT_CHAIN* pEffectChain);
+
+    HRESULT CreateMasteringVoice(
+        [out] IXAudio2MasteringVoice** ppMasteringVoice,
+        [in, defaultvalue(XAUDIO2_DEFAULT_CHANNELS)] UINT32 InputChannels,
+        [in, defaultvalue(XAUDIO2_DEFAULT_SAMPLERATE)] UINT32 InputSampleRate,
+        [in, defaultvalue(0)] UINT32 Flags,
+        [in, defaultvalue(0)] UINT32 DeviceIndex,
+        [in, defaultvalue(NULL)] const XAUDIO2_EFFECT_CHAIN* pEffectChain);
+
+    HRESULT StartEngine();
+
+    void StopEngine();
+
+    HRESULT CommitChanges([in] UINT32 OperationSet);
+
+    void GetPerformanceData([out] XAUDIO22_PERFORMANCE_DATA* pPerfData);
+
+    [local] void SetDebugConfiguration(
+        [in] const XAUDIO2_DEBUG_CONFIGURATION* pDebugConfiguration,
+        [in, defaultvalue(NULL)] void* pReserved);
+}
+
 [
     object,
     uuid(8bcf1f58-9fe7-4583-8ac6-e2adc465c8bb),