Version 0.9

Added: Filter type "IIR", which allows to specify a user-defined IIR filter of arbitrary order with custom coefficients.
Improved: For playback devices, the APO is now installed both as GFX (post-mix) and LFX (pre-mix) APO. Normally the filtering happens in GFX, but the command "Stage" allows to select LFX to apply effects based on the number of input channels.
Added: Expression language. The commands "If", "ElseIf", "Else", "EndIf", "Eval" and inline expressions allow to change the filter behaviour based on runtime conditions.
Added: Command "Copy", which copies audio data between channels.
Added: Command "Delay", which delays the audio on the currently selected channels.
Improved: Configuration files are now locked exclusively for writing while reading them.
Improved: There is now a transition (10 ms) from old to new configuration after loading.
Improved: Substantial internal restructuring to improve extensibility and maintainability. Filtering commands now work exactly in the order they were specified.
Fixed: When the microphone input was in stereo but the application requested a mono stream, the audio was heavily distorted.
Fixed: The sine sweep generated by the Benchmark application had floating-point precision issues leading to severe artifacts when certain filters were applied.

build.bat

@@ -1,10 +1,20 @@
 call "%VS100COMNTOOLS%\vsvars32.bat"
 msbuild EqualizerAPO.sln /p:Configuration=release /p:platform=win32 /t:rebuild
+if %ERRORLEVEL% GEQ 1 goto done
 msbuild EqualizerAPO.sln /p:Configuration=release /p:platform=x64 /t:rebuild
+if %ERRORLEVEL% GEQ 1 goto done
+
+if defined ProgramFiles(x86) (
+	set nsis="%ProgramFiles(x86)%\NSIS\makensis.exe"
+) else (
+	set nsis="%ProgramFiles%\NSIS\makensis.exe"
+)
 
 cd Setup
-"%ProgramFiles%\NSIS\makensis.exe" Setup32.nsi
-"%ProgramFiles%\NSIS\makensis.exe" Setup64.nsi
+%nsis% Setup32.nsi
+if %ERRORLEVEL% GEQ 1 goto done
+%nsis% Setup64.nsi
 cd..
 
+:done
 pause