diff --git a/code/nel/include/nel/3d/cluster.h b/code/nel/include/nel/3d/cluster.h
index 14b3fb13c..552d7474a 100644
--- a/code/nel/include/nel/3d/cluster.h
+++ b/code/nel/include/nel/3d/cluster.h
@@ -21,7 +21,6 @@
 #include "nel/misc/string_mapper.h"
 #include "nel/misc/plane.h"
 #include "nel/misc/aabbox.h"
-#include "nel/misc/sheet_id.h"
 
 #include "nel/3d/transform.h"
 
@@ -126,9 +125,9 @@ public:
 	//\name Sound related.
 	//@{
 	void				setSoundGroup(const std::string &soundGroup);
-	void				setSoundGroup(const NLMISC::CSheetId &soundGroupId);
+	void				setSoundGroup(const NLMISC::TStringId &soundGroupId);
 	const std::string	&getSoundGroup();
-	NLMISC::CSheetId	getSoundGroupId();
+	NLMISC::TStringId	getSoundGroupId();
 	void				setEnvironmentFx(const std::string &environmentFx);
 	void				setEnvironmentFx(const NLMISC::TStringId &environmentFxId);
 	const std::string	&getEnvironmentFx();
@@ -189,7 +188,7 @@ private:
 	std::vector<NLMISC::CPlane> _Volume;
 
 	/// Sound group name id
-	NLMISC::CSheetId	_SoundGroupId;
+	NLMISC::TStringId	_SoundGroupId;
 	/// Environement Fx name Id (using CStringMapper)
 	NLMISC::TStringId	_EnvironmentFxId;
 
diff --git a/code/nel/include/nel/sound/clustered_sound.h b/code/nel/include/nel/sound/clustered_sound.h
index 0736c5a5c..ed674f879 100644
--- a/code/nel/include/nel/sound/clustered_sound.h
+++ b/code/nel/include/nel/sound/clustered_sound.h
@@ -19,6 +19,7 @@
 
 #include "nel/misc/types_nl.h"
 #include "nel/misc/string_mapper.h"
+#include "nel/misc/sheet_id.h"
 #include <vector>
 #include <map>
 
@@ -249,14 +250,13 @@ private:
 	/// The segment of all the audio path.
 	std::vector<std::pair<NLMISC::CVector, NLMISC::CVector> >	_AudioPath;
 
-	typedef CHashMap<NLMISC::CSheetId, CClusterSound, NLMISC::CSheetIdHashMapTraits>	TClusterSoundCont;
+	typedef CHashMap<NLMISC::TStringId, CClusterSound, NLMISC::CStringIdHashMapTraits>	TClusterSoundCont;
 	/// The current cluster playing source indexed with sound group id
 	TClusterSoundCont		_Sources;
 
-	typedef CHashMap<NLMISC::CSheetId, NLMISC::CSheetId, NLMISC::CSheetIdHashMapTraits> TStringStringMap;
-	//typedef CHashMap<NLMISC::TStringId, NLMISC::TStringId, NLMISC::CStringIdHashMapTraits> TStringStringMap;
+	typedef CHashMap<NLMISC::TStringId, NLMISC::CSheetId, NLMISC::CStringIdHashMapTraits> TStringSheetMap;
 	/// The sound_group to sound assoc
-	TStringStringMap	_SoundGroupToSound;
+	TStringSheetMap	_SoundGroupToSound;
 };
 
 } // NLSOUND
diff --git a/code/nel/include/nel/sound/sound.h b/code/nel/include/nel/sound/sound.h
index c4c494912..a84393944 100644
--- a/code/nel/include/nel/sound/sound.h
+++ b/code/nel/include/nel/sound/sound.h
@@ -54,7 +54,7 @@ class CSound
 	friend class CAudioMixerUser;
 public:
 	/// Factory for specialized sound.
-	static CSound *createSound(const std::string &filename, NLGEORGES::UFormElm& formRoot);
+	static CSound *createSound(const NLMISC::CSheetId &sheetId, NLGEORGES::UFormElm& formRoot);
 
 	enum TSOUND_TYPE
 	{
diff --git a/code/nel/include/nel/sound/sound_bank.h b/code/nel/include/nel/sound/sound_bank.h
index 8a4573849..05993bb07 100644
--- a/code/nel/include/nel/sound/sound_bank.h
+++ b/code/nel/include/nel/sound/sound_bank.h
@@ -68,16 +68,16 @@ public:
 	bool				isLoaded();
 
 	/// Return a sound corresponding to a name.
-	CSound				*getSound(const NLMISC::CSheetId &name);
+	CSound				*getSound(const NLMISC::CSheetId &sheetId);
 
 	/// Return the names of the sounds
-	void				getNames( std::vector<NLMISC::CSheetId> &names );
+	void				getNames( std::vector<NLMISC::CSheetId> &sheetIds );
 
 	/// Return the number of sounds in this bank.
 	uint				countSounds();
 
 	void				addSound(CSound *sound);
-	void				removeSound(const NLMISC::CSheetId &name);
+	void				removeSound(const NLMISC::CSheetId &sheetId);
 
 
 private:
@@ -89,7 +89,8 @@ private:
 	typedef CHashMap<NLMISC::TStringId, TSimpleSoundContainer, NLMISC::CStringIdHashMapTraits>		TBufferAssocContainer;
 	/// Sound names hash map
 //	typedef std::hash_map<std::string, CSound*>								TSoundTable;
-	typedef CHashMap<NLMISC::CSheetId, CSound*, NLMISC::CSheetIdHashMapTraits>						TSoundTable;
+//	typedef CHashMap<NLMISC::CSheetId, CSound*, NLMISC::CSheetIdHashMapTraits>						TSoundTable;
+	typedef std::vector<CSound *> TSoundTable; // list the sheets by shortId of the sheetId
 
 	/// Assoc from buffer to sound. Used for sound unloading.
 	TBufferAssocContainer		_BufferAssoc;
diff --git a/code/nel/samples/sound/sound_sources/main.cpp b/code/nel/samples/sound/sound_sources/main.cpp
index 3ece14f73..c4efa7a4e 100644
--- a/code/nel/samples/sound/sound_sources/main.cpp
+++ b/code/nel/samples/sound/sound_sources/main.cpp
@@ -100,7 +100,7 @@ USource *OnAddSource( const char *name, float x, float y, float z )
 	/*
 	 * Create a source with sound 'name', and set some of its initial properties, if successful
 	 */
-	USource *source = AudioMixer->createSource( /*CStringMapper::map(name)*/ CSheetId(name) );
+	USource *source = AudioMixer->createSource(CSheetId(name));
 	if ( source != NULL )
 	{
 		source->setPos( CVector(x,y,z) );
@@ -161,8 +161,8 @@ int main()
 	printf( "One is 20 meters ahead, on the right\n" );
 	printf( "The other is 5 meters ahead, on the left\n" );
 	getchar();
-	USource *src1 = OnAddSource( "beep", 1.0f, 20.0f, 0.0f );  // Beep on the right, 20 meters ahead
-	USource *src2 = OnAddSource( "tuut", -2.0f, 5.0f, 0.0f ); // Tuut on the left, 5 meters ahead
+	USource *src1 = OnAddSource( "beep.sound", 1.0f, 20.0f, 0.0f );  // Beep on the right, 20 meters ahead
+	USource *src2 = OnAddSource( "tuut.sound", -2.0f, 5.0f, 0.0f ); // Tuut on the left, 5 meters ahead
 
 	// Second step: we will move the listener ahead
 	printf( "Press ENTER again to start moving the listener\n" );
diff --git a/code/nel/samples/sound/stream_file/stream_file.cpp b/code/nel/samples/sound/stream_file/stream_file.cpp
index 060c4b433..b07da8ba4 100644
--- a/code/nel/samples/sound/stream_file/stream_file.cpp
+++ b/code/nel/samples/sound/stream_file/stream_file.cpp
@@ -97,7 +97,7 @@ static void initSample()
 	
 	//NLMISC::CHTimer::startBench();
 
-	s_Source = s_AudioMixer->createSource(/*CStringMapper::map("stream_file")*/ CSheetId("stream_file"));
+	s_Source = s_AudioMixer->createSource(CSheetId("stream_file.sound"));
 	nlassert(s_Source);
 	s_StreamFileSource = dynamic_cast<CStreamFileSource *>(s_Source);
 	nlassert(s_StreamFileSource);
diff --git a/code/nel/samples/sound/stream_ogg_vorbis/stream_ogg_vorbis.cpp b/code/nel/samples/sound/stream_ogg_vorbis/stream_ogg_vorbis.cpp
index 490ae8dd5..e4a2e507c 100644
--- a/code/nel/samples/sound/stream_ogg_vorbis/stream_ogg_vorbis.cpp
+++ b/code/nel/samples/sound/stream_ogg_vorbis/stream_ogg_vorbis.cpp
@@ -87,7 +87,7 @@ static void initSample()
 	
 	//NLMISC::CHTimer::startBench();
 
-	USource *source = s_AudioMixer->createSource(CSheetId("default_stream")/*CStringMapper::map("default_stream")*/);
+	USource *source = s_AudioMixer->createSource(CSheetId("default_stream.sound"));
 	nlassert(source);
 	s_StreamSource = dynamic_cast<UStreamSource *>(source);
 	nlassert(s_StreamSource);
diff --git a/code/nel/src/3d/cluster.cpp b/code/nel/src/3d/cluster.cpp
index cb34b7f10..2faebcec7 100644
--- a/code/nel/src/3d/cluster.cpp
+++ b/code/nel/src/3d/cluster.cpp
@@ -51,9 +51,7 @@ CCluster::CCluster ()
 	// map a no fx string
 	_EnvironmentFxId = CStringMapper::map("no fx");
 	// map a no soundgroup string
-	_SoundGroupId = NLMISC::CSheetId::Unknown; /*CStringMapper::map("")*/;
-	nldebug("SOUNDSHEET: %s", _SoundGroupId.toString().c_str());
-
+	_SoundGroupId = CStringMapper::map("");
 
 	// I am a transform cluster
 	CTransform::setIsCluster(true);
@@ -78,21 +76,18 @@ CCluster::~CCluster()
 
 void CCluster::setSoundGroup(const std::string &soundGroup)
 {
-	_SoundGroupId = NLMISC::CSheetId(soundGroup);/*CStringMapper::map(soundGroup);*/
-	nldebug("SOUNDSHEET: %s", _SoundGroupId.toString().c_str());
-
+	_SoundGroupId = CStringMapper::map(soundGroup);
 }
-void CCluster::setSoundGroup(const NLMISC::CSheetId &soundGroupId)
+void CCluster::setSoundGroup(const NLMISC::TStringId &soundGroupId)
 {
 	_SoundGroupId = soundGroupId;
-	nldebug("SOUNDSHEET: %s", _SoundGroupId.toString().c_str());
 }
 const std::string &CCluster::getSoundGroup()
 {
-	return _SoundGroupId.toString();/*CStringMapper::unmap(_SoundGroupId)*/;
+	return CStringMapper::unmap(_SoundGroupId);
 }
 
-NLMISC::CSheetId CCluster::getSoundGroupId()
+NLMISC::TStringId CCluster::getSoundGroupId()
 {
 	return _SoundGroupId;
 }
@@ -309,8 +304,7 @@ void CCluster::serial (NLMISC::IStream&f)
 			std::string envFxName;
 
 			f.serial(soundGroup);
-			_SoundGroupId = NLMISC::CSheetId(soundGroup); /*CStringMapper::map(soundGroup)*/;
-			nldebug("SOUNDSHEET: %s", _SoundGroupId.toString().c_str());
+			_SoundGroupId = CStringMapper::map(soundGroup);
 
 			f.serial(envFxName);
 			if (envFxName == "")
@@ -320,7 +314,7 @@ void CCluster::serial (NLMISC::IStream&f)
 		else
 		{
 			// write the sound group
-			std::string soundGroup = _SoundGroupId.toString();/*CStringMapper::unmap(_SoundGroupId)*/;
+			std::string soundGroup = CStringMapper::unmap(_SoundGroupId);
 			f.serial(soundGroup);
 			// write the env fx name
 			std::string envFxName = CStringMapper::unmap(_EnvironmentFxId);
diff --git a/code/nel/src/3d/ps_sound.cpp b/code/nel/src/3d/ps_sound.cpp
index 322bd2729..5cee12c3e 100644
--- a/code/nel/src/3d/ps_sound.cpp
+++ b/code/nel/src/3d/ps_sound.cpp
@@ -261,17 +261,8 @@ void			CPSSound::serial(NLMISC::IStream &f) throw(NLMISC::EStream)
 	CPSLocatedBindable::serial(f);
 	// version 3 : added option to keep original pitch from the .sound
 	sint ver = f.serialVersion(3);
-	if (f.isReading())
-	{
-		std::string soundName;
-		f.serial(soundName);
-		_SoundName = NLMISC::CSheetId(soundName)/*NLMISC::CStringMapper::map(soundName)*/;
-	}
-	else
-	{
-		std::string soundName = _SoundName.toString()/*NLMISC::CStringMapper::unmap(_SoundName)*/;
-		f.serial(soundName);
-	}
+
+	_SoundName.serialString(f, "sound");
 
 	sint32 nbSounds;
 	bool hasScheme;
diff --git a/code/nel/src/sound/audio_mixer_user.cpp b/code/nel/src/sound/audio_mixer_user.cpp
index 016f3d13d..61dca9f9e 100644
--- a/code/nel/src/sound/audio_mixer_user.cpp
+++ b/code/nel/src/sound/audio_mixer_user.cpp
@@ -1050,9 +1050,8 @@ public:
 			for (uint i=0; i<size; ++i)
 			{
 				items->getArrayValue(soundName, i);
-				soundName = soundName.substr(0, soundName.find(".sound"));
-
-				cs.SoundNames.push_back(CSheetId(soundName)/*CStringMapper::map(soundName)*/);
+				nlassert(soundName.find(".sound") != std::string::npos);
+				cs.SoundNames.push_back(CSheetId(soundName));
 			}
 
 			if (!cs.SoundNames.empty())
@@ -1133,7 +1132,7 @@ void CAudioMixerUser::CControledSources::serial(NLMISC::IStream &s)
 		for (uint i=0; i<size; ++i)
 		{
 			s.serial(soundName);
-			SoundNames.push_back(CSheetId(soundName)/*CStringMapper::map(soundName)*/);
+			SoundNames.push_back(CSheetId(soundName.find(".sound") == std::string::npos ? (soundName + ".sound") : soundName));
 		}
 	}
 	else
@@ -1147,7 +1146,7 @@ void CAudioMixerUser::CControledSources::serial(NLMISC::IStream &s)
 
 		for (uint i=0; i<size; ++i)
 		{
-			soundName = SoundNames[i].toString();/*CStringMapper::unmap(SoundNames[i])*/;
+			soundName = SoundNames[i].toString();;
 			s.serial(soundName);
 		}
 	}
@@ -2313,7 +2312,6 @@ void			CAudioMixerUser::getLoadedSampleBankInfo(std::vector<std::pair<std::strin
 }
 
 
-
 void CAudioMixerUser::setListenerPos (const NLMISC::CVector &pos)
 {
 	_Listener.setPos(pos);
diff --git a/code/nel/src/sound/background_sound.cpp b/code/nel/src/sound/background_sound.cpp
index 66de89e79..1dbeba3fe 100644
--- a/code/nel/src/sound/background_sound.cpp
+++ b/code/nel/src/sound/background_sound.cpp
@@ -84,7 +84,8 @@ void CBackgroundSound::importForm(const std::string& filename, NLGEORGES::UFormE
 					// Read the sound name.
 					std::string soundName;
 					psoundItem->getValueByName(soundName, "Sound");
-					sound.SoundName = NLMISC::CSheetId(CFile::getFilenameWithoutExtension(soundName));/*CStringMapper::map(CFile::getFilenameWithoutExtension(soundName))*/;
+					nlassert(soundName.find(".sound") != std::string::npos);
+					sound.SoundName = NLMISC::CSheetId(soundName);
 
 
 					// Read the environnement flag.
diff --git a/code/nel/src/sound/background_sound_manager.cpp b/code/nel/src/sound/background_sound_manager.cpp
index 4eb5b042d..2008b37db 100644
--- a/code/nel/src/sound/background_sound_manager.cpp
+++ b/code/nel/src/sound/background_sound_manager.cpp
@@ -86,7 +86,8 @@ void CBackgroundSoundManager::addSound(const std::string &soundName, uint layerI
 	CAudioMixerUser *mixer = CAudioMixerUser::instance();
 	TSoundData	sd;
 
-	sd.SoundName = /*CStringMapper::map(soundName)*/ NLMISC::CSheetId(soundName);
+	nlassert(soundName.find(".sound") != std::string::npos);
+	sd.SoundName = NLMISC::CSheetId(soundName);
 	sd.Sound = mixer->getSoundId(sd.SoundName);
 	sd.Source = 0;
 
@@ -1431,21 +1432,15 @@ void CBackgroundSoundManager::TBanksData::serial(NLMISC::IStream &s)
 
 void CBackgroundSoundManager::TSoundData::serial(NLMISC::IStream &s)
 {
-	std::string str;
-
+	//std::string str;
+	SoundName.serialString(s, "sound");
 	if (s.isReading())
 	{
 		CAudioMixerUser *mixer = CAudioMixerUser::instance();
-		s.serial(str);
-		SoundName = /*NLMISC::CStringMapper::map(str)*/ NLMISC::CSheetId(str);
 		Sound = mixer->getSoundId(SoundName);
 		Source = NULL;
 		Selected = false;
 	}
-	else
-	{
-		s.serial(const_cast<std::string&>(SoundName.toString()/*NLMISC::CStringMapper::unmap(SoundName)*/));
-	}
 	s.serial(MinBox);
 	s.serial(MaxBox);
 	s.serial(Surface);
diff --git a/code/nel/src/sound/clustered_sound.cpp b/code/nel/src/sound/clustered_sound.cpp
index c2a8db8ef..25f0e5b64 100644
--- a/code/nel/src/sound/clustered_sound.cpp
+++ b/code/nel/src/sound/clustered_sound.cpp
@@ -70,7 +70,7 @@ float EAX_MATERIAL_PARAM[] =
 class CSoundGroupSerializer
 {
 public:
-	std::vector<std::pair<NLMISC::CSheetId, NLMISC::CSheetId> >	_SoundGroupAssoc;
+	std::vector<std::pair<NLMISC::TStringId, NLMISC::CSheetId> >	_SoundGroupAssoc;
 
 	// load the values using the george sheet (called by GEORGE::loadForm)
 	void readGeorges (const NLMISC::CSmartPtr<NLGEORGES::UForm> &form, const std::string &/* name */)
@@ -95,15 +95,9 @@ public:
 				item->getValueByName(soundGroup, ".SoundGroup");
 				item->getValueByName(sound, ".Sound");
 
-				string::size_type n = sound.rfind(".sound");
+				nlassert(sound.find(".sound") != std::string::npos);
 
-				if (n != string::npos)
-				{
-					// remove the tailing .sound
-					sound = sound.substr(0, n);
-				}
-
-				_SoundGroupAssoc.push_back(make_pair(CSheetId(soundGroup), CSheetId(sound) /*CStringMapper::map(soundGroup), CStringMapper::map(sound)*/));
+				_SoundGroupAssoc.push_back(make_pair(CStringMapper::map(soundGroup), CSheetId(sound)));
 			}
 		}
 		catch(...)
@@ -125,24 +119,18 @@ public:
 		{
 			if (s.isReading())
 			{
-				std::string soundGroup;
-				std::string sound;
+				TStringId soundGroup;
+				CSheetId sound;
 
-				s.serial(soundGroup);
-				s.serial(sound);
+				CStringMapper::serialString(s, soundGroup);
+				sound.serialString(s, "sound");
 
-				_SoundGroupAssoc.push_back(make_pair(CSheetId(soundGroup), CSheetId(sound) /*CStringMapper::map(soundGroup), CStringMapper::map(sound)*/));
+				_SoundGroupAssoc.push_back(make_pair(soundGroup, sound));
 			}
 			else
 			{
-				std::string soundGroup;
-				std::string sound;
-
-				soundGroup = _SoundGroupAssoc[i].first.toString();// CStringMapper::unmap(_SoundGroupAssoc[i].first);
-				sound = _SoundGroupAssoc[i].second.toString(); //CStringMapper::unmap(_SoundGroupAssoc[i].second);
-
-				s.serial(soundGroup);
-				s.serial(sound);
+				CStringMapper::serialString(s, _SoundGroupAssoc[i].first);
+				_SoundGroupAssoc[i].second.serialString(s, "sound");
 			}
 		}
 	}
@@ -254,10 +242,10 @@ void CClusteredSound::update(const CVector &listenerPos, const CVector &/* view
 	TClusterStatusMap::const_iterator first(_AudibleClusters.begin()), last(_AudibleClusters.end());
 	for (; first != last; ++first )
 	{
-		static NLMISC::CSheetId NO_SOUND_GROUP = /*CStringMapper::emptyId()*/NLMISC::CSheetId::Unknown;
+		static NLMISC::TStringId NO_SOUND_GROUP = CStringMapper::emptyId();
 		const CClusterSoundStatus &css = first->second;
 		CCluster *cluster = first->first;
-		NLMISC::CSheetId soundGroup;
+		NLMISC::TStringId soundGroup;
 
 		soundGroup = cluster->getSoundGroupId();
 
@@ -289,7 +277,7 @@ void CClusteredSound::update(const CVector &listenerPos, const CVector &/* view
 
 //				nldebug("Searching sound assoc for group [%s]", CStringMapper::unmap(soundGroup).c_str());
 
-				TStringStringMap::iterator it2(_SoundGroupToSound.find(soundGroup));
+				TStringSheetMap::iterator it2(_SoundGroupToSound.find(soundGroup));
 				if (it2 != _SoundGroupToSound.end())
 				{
 					NLMISC::CSheetId soundName = it2->second;
diff --git a/code/nel/src/sound/sound.cpp b/code/nel/src/sound/sound.cpp
index bb9fd9372..f1d06bd5f 100644
--- a/code/nel/src/sound/sound.cpp
+++ b/code/nel/src/sound/sound.cpp
@@ -37,8 +37,9 @@ using namespace NLMISC;
 
 namespace NLSOUND {
 
-CSound *CSound::createSound(const std::string &filename, NLGEORGES::UFormElm& formRoot)
+CSound *CSound::createSound(const NLMISC::CSheetId &sheetId, NLGEORGES::UFormElm& formRoot)
 {
+	std::string filename = sheetId.toString();
 	CSound *ret = NULL;
 	string	soundType;
 
@@ -170,7 +171,7 @@ void	CSound::serial(NLMISC::IStream &s)
 void				CSound::importForm(const std::string& filename, NLGEORGES::UFormElm& root)
 {
 	// Name
-	_Name = NLMISC::CSheetId(CFile::getFilenameWithoutExtension(filename));//CStringMapper::map(CFile::getFilenameWithoutExtension(filename));
+	_Name = NLMISC::CSheetId(filename);
 
 	// InternalConeAngle
 	uint32 inner;
diff --git a/code/nel/src/sound/sound_bank.cpp b/code/nel/src/sound/sound_bank.cpp
index 93cf09de4..1124eeaa5 100644
--- a/code/nel/src/sound/sound_bank.cpp
+++ b/code/nel/src/sound/sound_bank.cpp
@@ -123,14 +123,13 @@ CSoundBank::~CSoundBank()
 
 void CSoundBank::addSound(CSound *sound)
 {
-	std::pair<TSoundTable::iterator, bool> ret;
-	ret = _Sounds.insert(make_pair(sound->getName(), sound));
-	nlassert(ret.second);
+	nlassert(_Sounds.size() > sound->getName().getShortId());
+	_Sounds[sound->getName().getShortId()] = sound;
 }
 
-void CSoundBank::removeSound(const NLMISC::CSheetId &name)
+void CSoundBank::removeSound(const NLMISC::CSheetId &sheetId)
 {
-	_Sounds.erase(name);
+	_Sounds[sheetId.getShortId()] = NULL;
 }
 
 
@@ -155,7 +154,7 @@ public:
 	void readGeorges (const NLMISC::CSmartPtr<NLGEORGES::UForm> &form, const NLMISC::CSheetId &name)
 	{
 		// just call the sound creation method with the xml form.
-		Sound = CSound::createSound(name.toString(), form->getRootNode());
+		Sound = CSound::createSound(name, form->getRootNode());
 
 		// success ?
 //		if (_Sound != 0)
@@ -259,36 +258,51 @@ void CSoundBank::load(const std::string &packedSheetDir, bool packedSheetUpdate)
 {
 	// this structure is fill by the loadForm() function and will contain all you need
 	//std::map<std::string, CSoundSerializer> Container;
-	std::map<NLMISC::CSheetId, CSoundSerializer> Container;
+	std::map<NLMISC::CSheetId, CSoundSerializer> container;
 	nlassert(!_Loaded);
 	// Just call the GEORGE::loadFrom method to read all available sounds
-	::loadForm("sound", packedSheetDir + "sounds.packed_sheets", Container, packedSheetUpdate, false);
+	::loadForm("sound", packedSheetDir + "sounds.packed_sheets", container, packedSheetUpdate, false);
 	_Loaded = true;
 
-	// add all the loaded sound in the sound banks
-	//std::map<std::string, CSoundSerializer>::iterator first(Container.begin()), last(Container.end());
-	std::map<NLMISC::CSheetId, CSoundSerializer>::iterator first(Container.begin()), last(Container.end());
-	for (; first != last; ++first)
+	// get the largest sheet id needed and init the sound bank
+	uint32 maxShortId = 0;
 	{
-		if (first->second.Sound != 0)
-			addSound(first->second.Sound);
+		std::map<NLMISC::CSheetId, CSoundSerializer>::iterator first(container.begin()), last(container.end());
+		for (; first != last; ++first)
+		{
+			if (first->first.getShortId() > maxShortId)
+				maxShortId = first->first.getShortId();
+		}
+		++maxShortId; // inc for size = last idx + 1
+		nlassert(maxShortId < (container.size() * 8)); // ensure no ridiculous sheet id values
+		if (maxShortId > _Sounds.size())
+			_Sounds.resize(maxShortId);
 	}
 
-	Container.clear();
+	// add all the loaded sound in the sound banks
+	{
+		std::map<NLMISC::CSheetId, CSoundSerializer>::iterator first(container.begin()), last(container.end());
+		for (; first != last; ++first)
+		{
+			if (first->second.Sound != 0)
+				addSound(first->second.Sound);
+		}
+	}
+
+	container.clear();
 }
 
 
 /*
  * Unload all the sound samples in this bank.
  */
-void				CSoundBank::unload()
+void CSoundBank::unload()
 {
 	nlassert(_Loaded);
 
-	TSoundTable::iterator first(_Sounds.begin()), last(_Sounds.end());
-	for (; first != last; ++first)
+	for (TSoundTable::size_type i = 0; i < _Sounds.size(); ++i)
 	{
-		delete first->second;
+		delete _Sounds[i];
 	}
 
 	_Sounds.clear();
@@ -322,7 +336,7 @@ void				CSoundBank::unload()
 /*
  * Returns true if the samples in this bank have been loaded.
  */
-bool				CSoundBank::isLoaded()
+bool CSoundBank::isLoaded()
 {
 	return _Loaded;
 }
@@ -330,37 +344,32 @@ bool				CSoundBank::isLoaded()
 /*
  * Return a sound sample corresponding to a name.
  */
-CSound*			CSoundBank::getSound(const NLMISC::CSheetId &name)
+CSound* CSoundBank::getSound(const NLMISC::CSheetId &sheetId)
 {
-	// Find sound
-	TSoundTable::iterator iter = _Sounds.find(name);
-	if ( iter == _Sounds.end() )
-	{
-		return 0;
-	}
-	else
-	{
-		return (*iter).second;
-	}
+	if (sheetId == NLMISC::CSheetId::Unknown)
+		return NULL;
+	
+	nlassert(sheetId.getShortId() < _Sounds.size());
+	
+	return _Sounds[sheetId.getShortId()];
 }
 
 /**
  *  Return the names of the sounds
  */
-void				CSoundBank::getNames( std::vector<NLMISC::CSheetId> &names )
+void CSoundBank::getNames( std::vector<NLMISC::CSheetId> &sheetIds )
 {
-	TSoundTable::const_iterator iter;
-	for (iter = _Sounds.begin(); iter != _Sounds.end(); ++iter)
+	for (TSoundTable::size_type i = 0; i < _Sounds.size(); ++i)
 	{
-		names.push_back((*iter).first);
-		//nlwarning("getting sound %s", (*iter).first);
+		if (_Sounds[i])
+			sheetIds.push_back(_Sounds[i]->getName());
 	}
 }
 
 /*
  * Return the number of buffers in this bank.
  */
-uint				CSoundBank::countSounds()
+uint CSoundBank::countSounds()
 {
 	return (uint)_Sounds.size();
 }