diff --git a/projects/demo/demo.vcxproj b/projects/demo/demo.vcxproj
index 6e8324a..a42238e 100644
--- a/projects/demo/demo.vcxproj
+++ b/projects/demo/demo.vcxproj
@@ -45,11 +45,13 @@
     <OutDir>.\</OutDir>
     <IntDir>.\Release\</IntDir>
     <LinkIncremental>false</LinkIncremental>
+    <TargetName>stk-demo</TargetName>
   </PropertyGroup>
   <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Debug|Win32'">
     <OutDir>.\</OutDir>
     <IntDir>.\Debug\</IntDir>
     <LinkIncremental>true</LinkIncremental>
+    <TargetName>stk-demo</TargetName>
   </PropertyGroup>
   <ItemDefinitionGroup Condition="'$(Configuration)|$(Platform)'=='Release|Win32'">
     <ClCompile>
@@ -61,7 +63,7 @@
       <SuppressStartupBanner>true</SuppressStartupBanner>
       <WarningLevel>Level3</WarningLevel>
       <AdditionalIncludeDirectories>..\..\include;..\..\src\include;%(AdditionalIncludeDirectories)</AdditionalIncludeDirectories>
-      <PreprocessorDefinitions>NDEBUG;__LITTLE_ENDIAN__;__WINDOWS_MM__;WIN32;_CONSOLE;__WINDOWS_DS__;%(PreprocessorDefinitions)</PreprocessorDefinitions>
+      <PreprocessorDefinitions>NDEBUG;__LITTLE_ENDIAN__;__WINDOWS_MM__;WIN32;_CONSOLE;__WINDOWS_DS__;_USE_MATH_DEFINES;%(PreprocessorDefinitions)</PreprocessorDefinitions>
       <AssemblerListingLocation>.\Release\</AssemblerListingLocation>
       <PrecompiledHeaderOutputFile>.\Release\demo.pch</PrecompiledHeaderOutputFile>
       <ObjectFileName>.\Release\</ObjectFileName>
@@ -97,7 +99,7 @@
       <MinimalRebuild>true</MinimalRebuild>
       <DebugInformationFormat>ProgramDatabase</DebugInformationFormat>
       <AdditionalIncludeDirectories>..\..\include;..\..\src\include;%(AdditionalIncludeDirectories)</AdditionalIncludeDirectories>
-      <PreprocessorDefinitions>_DEBUG;__LITTLE_ENDIAN__;__WINDOWS_MM__;WIN32;_CONSOLE;__WINDOWS_DS__;%(PreprocessorDefinitions)</PreprocessorDefinitions>
+      <PreprocessorDefinitions>_DEBUG;__LITTLE_ENDIAN__;__WINDOWS_MM__;WIN32;_CONSOLE;__WINDOWS_DS__;_USE_MATH_DEFINES;%(PreprocessorDefinitions)</PreprocessorDefinitions>
       <AssemblerListingLocation>.\Debug\</AssemblerListingLocation>
       <PrecompiledHeaderOutputFile>.\Debug\demo.pch</PrecompiledHeaderOutputFile>
       <ObjectFileName>.\Debug\</ObjectFileName>
@@ -125,6 +127,8 @@
     </Link>
   </ItemDefinitionGroup>
   <ItemGroup>
+    <ClCompile Include="..\..\src\Iir.cpp" />
+    <ClCompile Include="..\..\src\Recorder.cpp" />
     <ClCompile Include="demo.cpp" />
     <ClCompile Include="utilities.cpp" />
     <ClCompile Include="..\..\src\include\asio.cpp" />
diff --git a/projects/demo/demo.vcxproj.filters b/projects/demo/demo.vcxproj.filters
index 9caad6e..c519d4c 100644
--- a/projects/demo/demo.vcxproj.filters
+++ b/projects/demo/demo.vcxproj.filters
@@ -248,257 +248,260 @@
     <ClCompile Include="..\..\src\Wurley.cpp">
       <Filter>Source Files</Filter>
     </ClCompile>
+    <ClCompile Include="..\..\src\Recorder.cpp">
+      <Filter>Source Files</Filter>
+    </ClCompile>
+    <ClCompile Include="..\..\src\Iir.cpp">
+      <Filter>Source Files</Filter>
+    </ClCompile>
   </ItemGroup>
   <ItemGroup>
     <ClInclude Include="utilities.h" />
-    <ClInclude Include="..\..\src\include\RtAudio.h">
+    <ClInclude Include="..\..\include\RtAudio.h">
       <Filter>Header Files</Filter>
     </ClInclude>
-    <ClInclude Include="..\..\src\include\RtMidi.h">
+    <ClInclude Include="..\..\include\ADSR.h">
       <Filter>Header Files</Filter>
     </ClInclude>
-    <ClInclude Include="..\..\src\include\RtWvIn.h">
+    <ClInclude Include="..\..\include\Asymp.h">
       <Filter>Header Files</Filter>
     </ClInclude>
-    <ClInclude Include="..\..\src\include\RtWvOut.h">
+    <ClInclude Include="..\..\include\BandedWG.h">
       <Filter>Header Files</Filter>
     </ClInclude>
-    <ClInclude Include="..\..\src\include\ADSR.h">
+    <ClInclude Include="..\..\include\BeeThree.h">
       <Filter>Header Files</Filter>
     </ClInclude>
-    <ClInclude Include="..\..\src\include\Asymp.h">
+    <ClInclude Include="..\..\include\BiQuad.h">
       <Filter>Header Files</Filter>
     </ClInclude>
-    <ClInclude Include="..\..\src\include\BandedWG.h">
+    <ClInclude Include="..\..\include\BlowBotl.h">
       <Filter>Header Files</Filter>
     </ClInclude>
-    <ClInclude Include="..\..\src\include\BeeThree.h">
+    <ClInclude Include="..\..\include\BlowHole.h">
       <Filter>Header Files</Filter>
     </ClInclude>
-    <ClInclude Include="..\..\src\include\BiQuad.h">
+    <ClInclude Include="..\..\include\Bowed.h">
       <Filter>Header Files</Filter>
     </ClInclude>
-    <ClInclude Include="..\..\src\include\BlowBotl.h">
+    <ClInclude Include="..\..\include\BowTable.h">
       <Filter>Header Files</Filter>
     </ClInclude>
-    <ClInclude Include="..\..\src\include\BlowHole.h">
+    <ClInclude Include="..\..\include\Brass.h">
       <Filter>Header Files</Filter>
     </ClInclude>
-    <ClInclude Include="..\..\src\include\Bowed.h">
+    <ClInclude Include="..\..\include\Clarinet.h">
       <Filter>Header Files</Filter>
     </ClInclude>
-    <ClInclude Include="..\..\src\include\BowTable.h">
+    <ClInclude Include="..\..\include\Delay.h">
       <Filter>Header Files</Filter>
     </ClInclude>
-    <ClInclude Include="..\..\src\include\Brass.h">
+    <ClInclude Include="..\..\include\DelayA.h">
       <Filter>Header Files</Filter>
     </ClInclude>
-    <ClInclude Include="..\..\src\include\Clarinet.h">
+    <ClInclude Include="..\..\include\DelayL.h">
       <Filter>Header Files</Filter>
     </ClInclude>
-    <ClInclude Include="..\..\src\include\Delay.h">
+    <ClInclude Include="..\..\include\Drummer.h">
       <Filter>Header Files</Filter>
     </ClInclude>
-    <ClInclude Include="..\..\src\include\DelayA.h">
+    <ClInclude Include="..\..\include\Effect.h">
       <Filter>Header Files</Filter>
     </ClInclude>
-    <ClInclude Include="..\..\src\include\DelayL.h">
+    <ClInclude Include="..\..\include\Envelope.h">
       <Filter>Header Files</Filter>
     </ClInclude>
-    <ClInclude Include="..\..\src\include\Drummer.h">
+    <ClInclude Include="..\..\include\FileLoop.h">
       <Filter>Header Files</Filter>
     </ClInclude>
-    <ClInclude Include="..\..\src\include\Effect.h">
+    <ClInclude Include="..\..\include\FileRead.h">
       <Filter>Header Files</Filter>
     </ClInclude>
-    <ClInclude Include="..\..\src\include\Envelope.h">
+    <ClInclude Include="..\..\include\FileWrite.h">
       <Filter>Header Files</Filter>
     </ClInclude>
-    <ClInclude Include="..\..\src\include\FileLoop.h">
+    <ClInclude Include="..\..\include\FileWvIn.h">
       <Filter>Header Files</Filter>
     </ClInclude>
-    <ClInclude Include="..\..\src\include\FileRead.h">
+    <ClInclude Include="..\..\include\FileWvOut.h">
       <Filter>Header Files</Filter>
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-    <ClInclude Include="..\..\src\include\FileWrite.h">
+    <ClInclude Include="..\..\include\Filter.h">
       <Filter>Header Files</Filter>
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+    <ClInclude Include="..\..\include\Fir.h">
       <Filter>Header Files</Filter>
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+    <ClInclude Include="..\..\include\Flute.h">
       <Filter>Header Files</Filter>
     </ClInclude>
-    <ClInclude Include="..\..\src\include\Filter.h">
+    <ClInclude Include="..\..\include\FM.h">
       <Filter>Header Files</Filter>
     </ClInclude>
-    <ClInclude Include="..\..\src\include\Fir.h">
+    <ClInclude Include="..\..\include\FMVoices.h">
       <Filter>Header Files</Filter>
     </ClInclude>
-    <ClInclude Include="..\..\src\include\Flute.h">
+    <ClInclude Include="..\..\include\FormSwep.h">
       <Filter>Header Files</Filter>
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+    <ClInclude Include="..\..\include\Function.h">
       <Filter>Header Files</Filter>
     </ClInclude>
-    <ClInclude Include="..\..\src\include\FMVoices.h">
+    <ClInclude Include="..\..\include\Generator.h">
       <Filter>Header Files</Filter>
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+    <ClInclude Include="..\..\include\HevyMetl.h">
       <Filter>Header Files</Filter>
     </ClInclude>
-    <ClInclude Include="..\..\src\include\Function.h">
+    <ClInclude Include="..\..\include\Instrmnt.h">
       <Filter>Header Files</Filter>
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-    <ClInclude Include="..\..\src\include\Generator.h">
+    <ClInclude Include="..\..\include\JCRev.h">
       <Filter>Header Files</Filter>
     </ClInclude>
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+    <ClInclude Include="..\..\include\JetTable.h">
       <Filter>Header Files</Filter>
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+    <ClInclude Include="..\..\include\Mandolin.h">
       <Filter>Header Files</Filter>
     </ClInclude>
-    <ClInclude Include="..\..\src\include\JCRev.h">
+    <ClInclude Include="..\..\include\Mesh2D.h">
       <Filter>Header Files</Filter>
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-    <ClInclude Include="..\..\src\include\JetTable.h">
+    <ClInclude Include="..\..\include\Messager.h">
       <Filter>Header Files</Filter>
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+    <ClInclude Include="..\..\include\Modal.h">
       <Filter>Header Files</Filter>
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       <Filter>Header Files</Filter>
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-    <ClInclude Include="..\..\src\include\Messager.h">
+    <ClInclude Include="..\..\include\Modulate.h">
       <Filter>Header Files</Filter>
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-    <ClInclude Include="..\..\src\include\Modal.h">
+    <ClInclude Include="..\..\include\Moog.h">
       <Filter>Header Files</Filter>
     </ClInclude>
-    <ClInclude Include="..\..\src\include\ModalBar.h">
+    <ClInclude Include="..\..\include\Mutex.h">
       <Filter>Header Files</Filter>
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+    <ClInclude Include="..\..\include\Noise.h">
       <Filter>Header Files</Filter>
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+    <ClInclude Include="..\..\include\NRev.h">
       <Filter>Header Files</Filter>
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+    <ClInclude Include="..\..\include\OnePole.h">
       <Filter>Header Files</Filter>
     </ClInclude>
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+    <ClInclude Include="..\..\include\OneZero.h">
       <Filter>Header Files</Filter>
     </ClInclude>
-    <ClInclude Include="..\..\src\include\NRev.h">
+    <ClInclude Include="..\..\include\PercFlut.h">
       <Filter>Header Files</Filter>
     </ClInclude>
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+    <ClInclude Include="..\..\include\Phonemes.h">
       <Filter>Header Files</Filter>
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+    <ClInclude Include="..\..\include\Plucked.h">
       <Filter>Header Files</Filter>
     </ClInclude>
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+    <ClInclude Include="..\..\include\PoleZero.h">
       <Filter>Header Files</Filter>
     </ClInclude>
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+    <ClInclude Include="..\..\include\PRCRev.h">
       <Filter>Header Files</Filter>
     </ClInclude>
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+    <ClInclude Include="..\..\include\ReedTable.h">
       <Filter>Header Files</Filter>
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+    <ClInclude Include="..\..\include\Resonate.h">
       <Filter>Header Files</Filter>
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+    <ClInclude Include="..\..\include\Rhodey.h">
       <Filter>Header Files</Filter>
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+    <ClInclude Include="..\..\include\RtMidi.h">
       <Filter>Header Files</Filter>
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+    <ClInclude Include="..\..\include\RtWvIn.h">
       <Filter>Header Files</Filter>
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+    <ClInclude Include="..\..\include\RtWvOut.h">
       <Filter>Header Files</Filter>
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+    <ClInclude Include="..\..\include\Sampler.h">
       <Filter>Header Files</Filter>
     </ClInclude>
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+    <ClInclude Include="..\..\include\Saxofony.h">
       <Filter>Header Files</Filter>
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-    <ClInclude Include="..\..\src\include\Shakers.h">
+    <ClInclude Include="..\..\include\Shakers.h">
       <Filter>Header Files</Filter>
     </ClInclude>
-    <ClInclude Include="..\..\src\include\Simple.h">
+    <ClInclude Include="..\..\include\Simple.h">
       <Filter>Header Files</Filter>
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+    <ClInclude Include="..\..\include\SineWave.h">
       <Filter>Header Files</Filter>
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+    <ClInclude Include="..\..\include\SingWave.h">
       <Filter>Header Files</Filter>
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-    <ClInclude Include="..\..\src\include\Sitar.h">
+    <ClInclude Include="..\..\include\Sitar.h">
       <Filter>Header Files</Filter>
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+    <ClInclude Include="..\..\include\SKINI.h">
       <Filter>Header Files</Filter>
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-    <ClInclude Include="..\..\src\include\Socket.h">
+    <ClInclude Include="..\..\include\Socket.h">
       <Filter>Header Files</Filter>
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-    <ClInclude Include="..\..\src\include\Sphere.h">
+    <ClInclude Include="..\..\include\Sphere.h">
       <Filter>Header Files</Filter>
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-    <ClInclude Include="..\..\src\include\StifKarp.h">
+    <ClInclude Include="..\..\include\StifKarp.h">
       <Filter>Header Files</Filter>
     </ClInclude>
-    <ClInclude Include="..\..\src\include\Stk.h">
+    <ClInclude Include="..\..\include\Stk.h">
       <Filter>Header Files</Filter>
     </ClInclude>
-    <ClInclude Include="..\..\src\include\TcpServer.h">
+    <ClInclude Include="..\..\include\TcpServer.h">
       <Filter>Header Files</Filter>
     </ClInclude>
-    <ClInclude Include="..\..\src\include\Thread.h">
+    <ClInclude Include="..\..\include\Thread.h">
       <Filter>Header Files</Filter>
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-    <ClInclude Include="..\..\src\include\TubeBell.h">
+    <ClInclude Include="..\..\include\TubeBell.h">
       <Filter>Header Files</Filter>
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-    <ClInclude Include="..\..\src\include\Twang.h">
+    <ClInclude Include="..\..\include\Twang.h">
       <Filter>Header Files</Filter>
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-    <ClInclude Include="..\..\src\include\TwoPole.h">
+    <ClInclude Include="..\..\include\TwoPole.h">
       <Filter>Header Files</Filter>
     </ClInclude>
-    <ClInclude Include="..\..\src\include\TwoZero.h">
+    <ClInclude Include="..\..\include\TwoZero.h">
       <Filter>Header Files</Filter>
     </ClInclude>
-    <ClInclude Include="..\..\src\include\Vector3D.h">
+    <ClInclude Include="..\..\include\Vector3D.h">
       <Filter>Header Files</Filter>
     </ClInclude>
-    <ClInclude Include="..\..\src\include\Voicer.h">
+    <ClInclude Include="..\..\include\Voicer.h">
       <Filter>Header Files</Filter>
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-    <ClInclude Include="..\..\src\include\Whistle.h">
+    <ClInclude Include="..\..\include\Whistle.h">
       <Filter>Header Files</Filter>
     </ClInclude>
-    <ClInclude Include="..\..\src\include\Wurley.h">
+    <ClInclude Include="..\..\include\Wurley.h">
       <Filter>Header Files</Filter>
     </ClInclude>
-    <ClInclude Include="..\..\src\include\WvIn.h">
+    <ClInclude Include="..\..\include\WvIn.h">
       <Filter>Header Files</Filter>
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-    <ClInclude Include="..\..\src\include\WvOut.h">
+    <ClInclude Include="..\..\include\WvOut.h">
       <Filter>Header Files</Filter>
     </ClInclude>
   </ItemGroup>
-  <ItemGroup>
-    <None Include="notes.txt" />
-  </ItemGroup>
 </Project>
\ No newline at end of file