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diff --git a/unittests/soundtest/soundtest.cpp b/unittests/soundtest/soundtest.cpp
new file mode 100644
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+++ b/unittests/soundtest/soundtest.cpp
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+//========= Copyright Valve Corporation, All rights reserved. ============//
+//
+// The copyright to the contents herein is the property of Valve, L.L.C.
+// The contents may be used and/or copied only with the written permission of
+// Valve, L.L.C., or in accordance with the terms and conditions stipulated in
+// the agreement/contract under which the contents have been supplied.
+//
+// $Header: $
+// $NoKeywords: $
+//
+// Sound unit test application
+//
+//=============================================================================
+
+#include <windows.h>
+#include "tier0/dbg.h"
+#include "tier0/icommandline.h"
+#include "filesystem.h"
+#include "datacache/idatacache.h"
+#include "appframework/appframework.h"
+#include "soundsystem/isoundsystem.h"
+#include "vstdlib/cvar.h"
+#include "filesystem_init.h"
+
+
+//-----------------------------------------------------------------------------
+// Main system interfaces
+//-----------------------------------------------------------------------------
+IFileSystem *g_pFileSystem;
+ISoundSystem *g_pSoundSystem;
+
+
+//-----------------------------------------------------------------------------
+// Standard spew functions
+//-----------------------------------------------------------------------------
+static SpewRetval_t SoundTestOutputFunc( SpewType_t spewType, char const *pMsg )
+{
+	printf( pMsg );
+	fflush( stdout );
+
+	if (spewType == SPEW_ERROR)
+		return SPEW_ABORT;
+	return (spewType == SPEW_ASSERT) ? SPEW_DEBUGGER : SPEW_CONTINUE; 
+}
+
+
+
+
+//-----------------------------------------------------------------------------
+// The application object
+//-----------------------------------------------------------------------------
+class CSoundTestApp : public CDefaultAppSystemGroup<CSteamAppSystemGroup>
+{
+public:
+	// Methods of IApplication
+	virtual bool Create();
+	virtual bool PreInit();
+	virtual int Main();
+	virtual void PostShutdown();
+	virtual void Destroy();
+
+private:
+	bool CreateAppWindow( char const *pTitle, bool bWindowed, int w, int h );
+	bool SetupSearchPaths();
+	void AppPumpMessages();
+
+	// Windproc
+	static LONG WINAPI WinAppWindowProc(HWND hWnd, UINT uMsg, WPARAM wParam, LPARAM lParam);
+	LONG WindowProc(HWND hWnd, UINT uMsg, WPARAM wParam, LPARAM lParam);
+
+	HWND m_hWnd;
+	bool m_bExitMainLoop;
+};
+
+static CSoundTestApp s_SoundTestApp;
+DEFINE_WINDOWED_STEAM_APPLICATION_OBJECT_GLOBALVAR( CSoundTestApp, s_SoundTestApp );
+
+
+//-----------------------------------------------------------------------------
+// The application object
+//-----------------------------------------------------------------------------
+bool CSoundTestApp::Create()
+{
+	SpewOutputFunc( SoundTestOutputFunc );
+
+	// Add in the cvar factory
+	AppModule_t cvarModule = LoadModule( VStdLib_GetICVarFactory() );
+	AddSystem( cvarModule, CVAR_INTERFACE_VERSION );
+
+	AppSystemInfo_t appSystems[] = 
+	{
+		{ "datacache.dll",			DATACACHE_INTERFACE_VERSION },
+		{ "soundsystem.dll",		SOUNDSYSTEM_INTERFACE_VERSION },
+		{ "", "" }	// Required to terminate the list
+	};
+
+	if ( !AddSystems( appSystems ) ) 
+		return false;
+
+	g_pFileSystem = (IFileSystem*)FindSystem( FILESYSTEM_INTERFACE_VERSION );
+	g_pSoundSystem = (ISoundSystem*)FindSystem( SOUNDSYSTEM_INTERFACE_VERSION );
+
+	return ( g_pFileSystem && g_pSoundSystem );
+}
+
+void CSoundTestApp::Destroy()
+{
+	g_pFileSystem = NULL;
+	g_pSoundSystem = NULL;
+}
+
+
+//-----------------------------------------------------------------------------
+// Window management
+//-----------------------------------------------------------------------------
+bool CSoundTestApp::CreateAppWindow( char const *pTitle, bool bWindowed, int w, int h )
+{
+	WNDCLASSEX		wc;
+	memset( &wc, 0, sizeof( wc ) );
+	wc.cbSize		 = sizeof( wc );
+    wc.style         = CS_OWNDC | CS_DBLCLKS;
+    wc.lpfnWndProc   = WinAppWindowProc;
+    wc.hInstance     = (HINSTANCE)GetAppInstance();
+    wc.lpszClassName = "Valve001";
+	wc.hIcon		 = NULL; //LoadIcon( s_HInstance, MAKEINTRESOURCE( IDI_LAUNCHER ) );
+	wc.hIconSm		 = wc.hIcon;
+
+    RegisterClassEx( &wc );
+
+	// Note, it's hidden
+	DWORD style = WS_POPUP | WS_CLIPSIBLINGS;
+	
+	if ( bWindowed )
+	{
+		// Give it a frame
+		style |= WS_OVERLAPPEDWINDOW;
+		style &= ~WS_THICKFRAME;
+	}
+
+	// Never a max box
+	style &= ~WS_MAXIMIZEBOX;
+
+	RECT windowRect;
+	windowRect.top		= 0;
+	windowRect.left		= 0;
+	windowRect.right	= w;
+	windowRect.bottom	= h;
+
+	// Compute rect needed for that size client area based on window style
+	AdjustWindowRectEx(&windowRect, style, FALSE, 0);
+
+	// Create the window
+	m_hWnd = CreateWindow( wc.lpszClassName, pTitle, style, 0, 0, 
+		windowRect.right - windowRect.left, windowRect.bottom - windowRect.top, 
+		NULL, NULL, (HINSTANCE)GetAppInstance(), NULL );
+
+	if ( m_hWnd == INVALID_HANDLE_VALUE )
+		return false;
+
+    int     CenterX, CenterY;
+
+	CenterX = (GetSystemMetrics(SM_CXSCREEN) - w) / 2;
+	CenterY = (GetSystemMetrics(SM_CYSCREEN) - h) / 2;
+	CenterX = (CenterX < 0) ? 0: CenterX;
+	CenterY = (CenterY < 0) ? 0: CenterY;
+
+	// In VCR modes, keep it in the upper left so mouse coordinates are always relative to the window.
+	SetWindowPos (m_hWnd, NULL, CenterX, CenterY, 0, 0,
+				  SWP_NOSIZE | SWP_NOZORDER | SWP_SHOWWINDOW | SWP_DRAWFRAME);
+
+	return true;
+}
+
+
+//-----------------------------------------------------------------------------
+// Message handler
+//-----------------------------------------------------------------------------
+LONG CSoundTestApp::WindowProc(HWND hWnd, UINT uMsg, WPARAM wParam, LPARAM lParam)
+{
+	if ( uMsg == WM_CLOSE )
+	{
+		m_bExitMainLoop = true;
+	}
+	return DefWindowProc( hWnd, uMsg, wParam, lParam );
+}
+
+LONG WINAPI CSoundTestApp::WinAppWindowProc( HWND hWnd, UINT uMsg, WPARAM wParam, LPARAM lParam )
+{
+	return s_SoundTestApp.WindowProc( hWnd, uMsg, wParam, lParam );
+}
+
+	
+//-----------------------------------------------------------------------------
+// Sets up the game path
+//-----------------------------------------------------------------------------
+bool CSoundTestApp::SetupSearchPaths()
+{
+	CFSSteamSetupInfo steamInfo;
+	steamInfo.m_pDirectoryName = NULL;
+	steamInfo.m_bOnlyUseDirectoryName = false;
+	steamInfo.m_bToolsMode = true;
+	steamInfo.m_bSetSteamDLLPath = true;
+	steamInfo.m_bSteam = g_pFileSystem->IsSteam();
+	if ( FileSystem_SetupSteamEnvironment( steamInfo ) != FS_OK )
+		return false;
+
+	CFSMountContentInfo fsInfo;
+	fsInfo.m_pFileSystem = g_pFileSystem;
+	fsInfo.m_bToolsMode = true;
+	fsInfo.m_pDirectoryName = steamInfo.m_GameInfoPath;
+
+	if ( FileSystem_MountContent( fsInfo ) != FS_OK )
+		return false;
+
+	// Finally, load the search paths for the "GAME" path.
+	CFSSearchPathsInit searchPathsInit;
+	searchPathsInit.m_pDirectoryName = steamInfo.m_GameInfoPath;
+	searchPathsInit.m_pFileSystem = g_pFileSystem;
+	if ( FileSystem_LoadSearchPaths( searchPathsInit ) != FS_OK )
+		return false;
+
+	g_pFileSystem->AddSearchPath( steamInfo.m_GameInfoPath, "SKIN", PATH_ADD_TO_HEAD );
+
+	FileSystem_AddSearchPath_Platform( g_pFileSystem, steamInfo.m_GameInfoPath );
+
+	// and now add episodic to the GAME searchpath
+	char shorts[MAX_PATH];
+	Q_strncpy( shorts, steamInfo.m_GameInfoPath, MAX_PATH );
+	Q_StripTrailingSlash( shorts );
+	Q_strncat( shorts, "/../episodic", MAX_PATH, MAX_PATH );
+
+	g_pFileSystem->AddSearchPath( shorts, "GAME", PATH_ADD_TO_HEAD );
+
+	return true;
+}
+
+
+//-----------------------------------------------------------------------------
+// PreInit, PostShutdown
+//-----------------------------------------------------------------------------
+bool CSoundTestApp::PreInit( )
+{
+	// Add paths...
+	if ( !SetupSearchPaths() )
+		return false;
+
+	const char *pArg;
+	int iWidth = 1024;
+	int iHeight = 768;
+	bool bWindowed = (CommandLine()->CheckParm( "-fullscreen" ) == NULL);
+	if (CommandLine()->CheckParm( "-width", &pArg ))
+	{
+		iWidth = atoi( pArg );
+	}
+	if (CommandLine()->CheckParm( "-height", &pArg ))
+	{
+		iHeight = atoi( pArg );
+	}
+
+	if ( !CreateAppWindow( "SoundTest", bWindowed, iWidth, iHeight ) )
+		return false;
+
+	return true; 
+}
+
+void CSoundTestApp::PostShutdown()
+{
+}
+
+
+//-----------------------------------------------------------------------------
+// Pump messages
+//-----------------------------------------------------------------------------
+void CSoundTestApp::AppPumpMessages()
+{
+	MSG msg;
+	while ( PeekMessage( &msg, NULL, 0, 0, PM_REMOVE ) )
+	{
+		TranslateMessage( &msg );
+		DispatchMessage( &msg );
+	}
+}
+
+
+//-----------------------------------------------------------------------------
+// The application object
+//-----------------------------------------------------------------------------
+int CSoundTestApp::Main()
+{
+	CAudioSource *pSource = g_pSoundSystem->LoadSound( "sound/ambient/alarms/alarm1.wav" );
+
+	CAudioMixer *pMixer;
+	g_pSoundSystem->PlaySound( pSource, 1.0f, &pMixer );
+
+	m_bExitMainLoop = false;
+	while ( !m_bExitMainLoop )
+	{
+		AppPumpMessages();
+		g_pSoundSystem->Update( Plat_FloatTime() );
+	}
+
+	return 1;
+}
+
+
+