diff --git a/idl/Windows.Xbox.Chat.idl b/idl/Windows.Xbox.Chat.idl
index e726fdd..998f0d7 100644
--- a/idl/Windows.Xbox.Chat.idl
+++ b/idl/Windows.Xbox.Chat.idl
@@ -108,7 +108,7 @@ namespace Windows.Xbox.Chat
         [interface_name("IChatDecoder", 3165955b-adcf-4239-9e63-07b2e9533bfd)]
         {
             Format Format { get; };
-            Windows.Storage.Streams.IBuffer Decode(Windows.Storage.Streams.IBuffer buffer);
+            void Decode(Windows.Storage.Streams.IBuffer buffer, out Windows.Storage.Streams.IBuffer decodedBuffer);
         }
 
         [interface_name("IChatDecoder2", 4d519838-b712-42b0-a3c5-5658954fa76a)]
@@ -127,7 +127,7 @@ namespace Windows.Xbox.Chat
 
         [interface_name("IChatEncoder", ed67b7a3-3721-47ff-b506-7056a7966b09)]
         {
-            Windows.Storage.Streams.IBuffer Encode(Windows.Storage.Streams.IBuffer buffer);
+            void Encode(Windows.Storage.Streams.IBuffer buffer, out Windows.Storage.Streams.IBuffer encodedBuffer);
         }
 
         [interface_name("IChatEncoder2", 25ce9936-2db9-4ce5-be78-5ab4f25aba86)]
@@ -167,8 +167,8 @@ namespace Windows.Xbox.Chat
         ChatSession();
         [constructor_name("IChatSessionFactory", 53cb6065-c211-4b21-a3ef-cd544d22aba1)]
         {
-            ChatSession(Windows.Foundation.TimeSpan time, ChatFeatures enabledFeatures, ChatSession session);
-            ChatSession(Windows.Foundation.TimeSpan time, UInt32 processorAffinity, ChatFeatures enabledFeatures, ChatSession session);
+            ChatSession(Windows.Foundation.TimeSpan time, ChatFeatures enabledFeatures);
+            ChatSession(Windows.Foundation.TimeSpan time, UInt32 processorAffinity, ChatFeatures enabledFeatures);
         }
 
         [interface_name("IChatSession", 9af8480a-16a5-4905-ac0a-5514f3427893)]
@@ -220,11 +220,11 @@ namespace Windows.Xbox.Chat
     runtimeclass Format
     {
         Format();
-        UInt32 BitsPerSample { get; set; };
+        UInt32 BitsPerSample { set; get; };
         UInt32 Bitrate { get; };
-        UInt32 ChannelCount { get; set; };
-        UInt32 SampleRate { get; set; };
-        Guid Subtype { get; set; };
+        UInt32 ChannelCount { set; get; };
+        UInt32 SampleRate { set; get; };
+        Guid Subtype { set; get; };
     }
 
     [interface_name("IChatUserCorrelation", 48e51c40-0eeb-426b-b44a-858cfd4c3e6c)]
diff --git a/projects/WinDurango.WinRT/include/WinDurango.WinRT/Windows/Xbox/Chat/Windows.Xbox.Chat.ChatDecoder.h b/projects/WinDurango.WinRT/include/WinDurango.WinRT/Windows/Xbox/Chat/Windows.Xbox.Chat.ChatDecoder.h
index d0c8f2a..b9fb9b4 100644
--- a/projects/WinDurango.WinRT/include/WinDurango.WinRT/Windows/Xbox/Chat/Windows.Xbox.Chat.ChatDecoder.h
+++ b/projects/WinDurango.WinRT/include/WinDurango.WinRT/Windows/Xbox/Chat/Windows.Xbox.Chat.ChatDecoder.h
@@ -8,7 +8,7 @@ namespace winrt::Windows::Xbox::Chat::implementation
         ChatDecoder() = default;
 
         winrt::Windows::Xbox::Chat::Format Format();
-        winrt::Windows::Storage::Streams::IBuffer Decode(winrt::Windows::Storage::Streams::IBuffer const& buffer);
+        void Decode(winrt::Windows::Storage::Streams::IBuffer const& buffer, winrt::Windows::Storage::Streams::IBuffer& decodedBuffer);
         int32_t IsDataInFlight();
     };
 }
diff --git a/projects/WinDurango.WinRT/include/WinDurango.WinRT/Windows/Xbox/Chat/Windows.Xbox.Chat.ChatEncoder.h b/projects/WinDurango.WinRT/include/WinDurango.WinRT/Windows/Xbox/Chat/Windows.Xbox.Chat.ChatEncoder.h
index b1cc4b4..0057e1b 100644
--- a/projects/WinDurango.WinRT/include/WinDurango.WinRT/Windows/Xbox/Chat/Windows.Xbox.Chat.ChatEncoder.h
+++ b/projects/WinDurango.WinRT/include/WinDurango.WinRT/Windows/Xbox/Chat/Windows.Xbox.Chat.ChatEncoder.h
@@ -8,7 +8,7 @@ namespace winrt::Windows::Xbox::Chat::implementation
         ChatEncoder() = default;
 
         ChatEncoder(winrt::Windows::Xbox::Chat::Format const& format, winrt::Windows::Xbox::Chat::EncodingQuality const& quality);
-        winrt::Windows::Storage::Streams::IBuffer Encode(winrt::Windows::Storage::Streams::IBuffer const& buffer);
+        void Encode(winrt::Windows::Storage::Streams::IBuffer const& buffer, winrt::Windows::Storage::Streams::IBuffer& encodedBuffer);
         int32_t IsDataInFlight();
         void Encode(winrt::Windows::Storage::Streams::IBuffer const& buffer, winrt::Windows::Xbox::Chat::ChatBufferSource const& source, winrt::Windows::Storage::Streams::IBuffer& encodedBuffer, winrt::Windows::Xbox::Chat::ChatBufferSource& encodedSource);
     };
diff --git a/projects/WinDurango.WinRT/include/WinDurango.WinRT/Windows/Xbox/Chat/Windows.Xbox.Chat.ChatSession.h b/projects/WinDurango.WinRT/include/WinDurango.WinRT/Windows/Xbox/Chat/Windows.Xbox.Chat.ChatSession.h
index e806145..e1d1e6c 100644
--- a/projects/WinDurango.WinRT/include/WinDurango.WinRT/Windows/Xbox/Chat/Windows.Xbox.Chat.ChatSession.h
+++ b/projects/WinDurango.WinRT/include/WinDurango.WinRT/Windows/Xbox/Chat/Windows.Xbox.Chat.ChatSession.h
@@ -42,8 +42,8 @@ namespace winrt::Windows::Xbox::Chat::implementation
     {
         ChatSession() = default;
 
-        ChatSession(winrt::Windows::Foundation::TimeSpan const& time, winrt::Windows::Xbox::Chat::ChatFeatures const& enabledFeatures, winrt::Windows::Xbox::Chat::ChatSession const& session);
-        ChatSession(winrt::Windows::Foundation::TimeSpan const& time, uint32_t processorAffinity, winrt::Windows::Xbox::Chat::ChatFeatures const& enabledFeatures, winrt::Windows::Xbox::Chat::ChatSession const& session);
+        ChatSession(winrt::Windows::Foundation::TimeSpan const& time, winrt::Windows::Xbox::Chat::ChatFeatures const& enabledFeatures);
+        ChatSession(winrt::Windows::Foundation::TimeSpan const& time, uint32_t processorAffinity, winrt::Windows::Xbox::Chat::ChatFeatures const& enabledFeatures);
         winrt::Windows::Foundation::Collections::IVectorView<winrt::Windows::Xbox::Chat::ChatChannel> Channels();
         winrt::event_token StateChangedEvent(winrt::Windows::Xbox::Chat::ChatSessionStateChangedHandler const& handler);
         void StateChangedEvent(winrt::event_token const& token) noexcept;
diff --git a/projects/WinDurango.WinRT/include/WinDurango.WinRT/Windows/Xbox/Chat/Windows.Xbox.Chat.Format.h b/projects/WinDurango.WinRT/include/WinDurango.WinRT/Windows/Xbox/Chat/Windows.Xbox.Chat.Format.h
index 9b1ca65..a7ad6e5 100644
--- a/projects/WinDurango.WinRT/include/WinDurango.WinRT/Windows/Xbox/Chat/Windows.Xbox.Chat.Format.h
+++ b/projects/WinDurango.WinRT/include/WinDurango.WinRT/Windows/Xbox/Chat/Windows.Xbox.Chat.Format.h
@@ -7,15 +7,15 @@ namespace winrt::Windows::Xbox::Chat::implementation
     {
         Format() = default;
 
-        uint32_t BitsPerSample();
         void BitsPerSample(uint32_t value);
+        uint32_t BitsPerSample();
         uint32_t Bitrate();
-        uint32_t ChannelCount();
         void ChannelCount(uint32_t value);
-        uint32_t SampleRate();
+        uint32_t ChannelCount();
         void SampleRate(uint32_t value);
-        winrt::guid Subtype();
+        uint32_t SampleRate();
         void Subtype(winrt::guid const& value);
+        winrt::guid Subtype();
     private:
         uint32_t bitsPerSample;
         uint32_t channelCount;
diff --git a/projects/WinDurango.WinRT/src/Windows/Xbox/Chat/Windows.Xbox.Chat.ChatDecoder.cpp b/projects/WinDurango.WinRT/src/Windows/Xbox/Chat/Windows.Xbox.Chat.ChatDecoder.cpp
index d15430d..51125cd 100644
--- a/projects/WinDurango.WinRT/src/Windows/Xbox/Chat/Windows.Xbox.Chat.ChatDecoder.cpp
+++ b/projects/WinDurango.WinRT/src/Windows/Xbox/Chat/Windows.Xbox.Chat.ChatDecoder.cpp
@@ -8,7 +8,7 @@ namespace winrt::Windows::Xbox::Chat::implementation
         p_wd->log.Warn("WinDurango::WinRT::Windows::Xbox::Chat::ChatDecoder", "Unimplemented: Format");
         throw hresult_not_implemented();
     }
-    winrt::Windows::Storage::Streams::IBuffer ChatDecoder::Decode(winrt::Windows::Storage::Streams::IBuffer const& buffer)
+    void ChatDecoder::Decode(winrt::Windows::Storage::Streams::IBuffer const& buffer, winrt::Windows::Storage::Streams::IBuffer& decodedBuffer)
     {
         p_wd->log.Warn("WinDurango::WinRT::Windows::Xbox::Chat::ChatDecoder", "Unimplemented: Decode");
         throw hresult_not_implemented();
diff --git a/projects/WinDurango.WinRT/src/Windows/Xbox/Chat/Windows.Xbox.Chat.ChatEncoder.cpp b/projects/WinDurango.WinRT/src/Windows/Xbox/Chat/Windows.Xbox.Chat.ChatEncoder.cpp
index 529bf5e..a164b33 100644
--- a/projects/WinDurango.WinRT/src/Windows/Xbox/Chat/Windows.Xbox.Chat.ChatEncoder.cpp
+++ b/projects/WinDurango.WinRT/src/Windows/Xbox/Chat/Windows.Xbox.Chat.ChatEncoder.cpp
@@ -8,7 +8,7 @@ namespace winrt::Windows::Xbox::Chat::implementation
         p_wd->log.Warn("WinDurango::WinRT::Windows::Xbox::Chat::ChatEncoder", "Unimplemented: ChatEncoder");
         throw hresult_not_implemented();
     }
-    winrt::Windows::Storage::Streams::IBuffer ChatEncoder::Encode(winrt::Windows::Storage::Streams::IBuffer const& buffer)
+    void ChatEncoder::Encode(winrt::Windows::Storage::Streams::IBuffer const& buffer, winrt::Windows::Storage::Streams::IBuffer& encodedBuffer)
     {
         p_wd->log.Warn("WinDurango::WinRT::Windows::Xbox::Chat::ChatEncoder", "Unimplemented: Encode");
         throw hresult_not_implemented();
diff --git a/projects/WinDurango.WinRT/src/Windows/Xbox/Chat/Windows.Xbox.Chat.ChatSession.cpp b/projects/WinDurango.WinRT/src/Windows/Xbox/Chat/Windows.Xbox.Chat.ChatSession.cpp
index 31114cb..e014d8a 100644
--- a/projects/WinDurango.WinRT/src/Windows/Xbox/Chat/Windows.Xbox.Chat.ChatSession.cpp
+++ b/projects/WinDurango.WinRT/src/Windows/Xbox/Chat/Windows.Xbox.Chat.ChatSession.cpp
@@ -68,12 +68,12 @@ namespace winrt::Windows::Xbox::Chat::implementation
         p_wd->log.Warn("WinDurango::WinRT::Windows::Xbox::Chat::ChatSessionState", "Unimplemented: RenderTargets");
         throw hresult_not_implemented();
     }
-    ChatSession::ChatSession(winrt::Windows::Foundation::TimeSpan const& time, winrt::Windows::Xbox::Chat::ChatFeatures const& enabledFeatures, winrt::Windows::Xbox::Chat::ChatSession const& session)
+    ChatSession::ChatSession(winrt::Windows::Foundation::TimeSpan const& time, winrt::Windows::Xbox::Chat::ChatFeatures const& enabledFeatures)
     {
         p_wd->log.Warn("WinDurango::WinRT::Windows::Xbox::Chat::ChatSession", "Unimplemented: ChatSession(TimeSpan, ...)");
         throw hresult_not_implemented();
     }
-    ChatSession::ChatSession(winrt::Windows::Foundation::TimeSpan const& time, uint32_t processorAffinity, winrt::Windows::Xbox::Chat::ChatFeatures const& enabledFeatures, winrt::Windows::Xbox::Chat::ChatSession const& session)
+    ChatSession::ChatSession(winrt::Windows::Foundation::TimeSpan const& time, uint32_t processorAffinity, winrt::Windows::Xbox::Chat::ChatFeatures const& enabledFeatures)
     {
         p_wd->log.Warn("WinDurango::WinRT::Windows::Xbox::Chat::ChatSession", "Unimplemented: ChatSession(TimeSpan, uint32_t, ...)");
         throw hresult_not_implemented();