diff --git a/src/audio/AudioLogic.cpp b/src/audio/AudioLogic.cpp
index bf99f991..7bc2b93f 100644
--- a/src/audio/AudioLogic.cpp
+++ b/src/audio/AudioLogic.cpp
@@ -2027,33 +2027,17 @@ cAudioManager::ProcessVehicleHorn(cVehicleParams *params)
 }
 
 bool
-cAudioManager::UsesSiren(int32 model) const
+cAudioManager::UsesSiren(cVehicleParams *params) const
 {
-	switch (model) {
-	case FIRETRUK:
-	case AMBULAN:
-	case FBICAR:
-	case POLICE:
-	case ENFORCER:
-	case PREDATOR:
-		return true;
-	default:
-		return false;
-	}
+	params->m_pVehicle->UsesSiren();
 }
 
 bool
-cAudioManager::UsesSirenSwitching(int32 model) const
+cAudioManager::UsesSirenSwitching(cVehicleParams *params) const
 {
-	switch (model) {
-	case AMBULAN:
-	case POLICE:
-	case ENFORCER:
-	case PREDATOR:
-		return true;
-	default:
+	if (params->m_nIndex == FIRETRUK || params->m_nIndex == MRWHOOP)
 		return false;
-	}
+	return params->m_pVehicle->UsesSiren();
 }
 
 bool
diff --git a/src/audio/AudioManager.cpp b/src/audio/AudioManager.cpp
index d2a85285..338f33a4 100644
--- a/src/audio/AudioManager.cpp
+++ b/src/audio/AudioManager.cpp
@@ -275,6 +275,7 @@ cAudioManager::ResetTimers(uint32 time)
 		SampleManager.SetEffectsFadeVolume(0);
 		SampleManager.SetMusicFadeVolume(0);
 		MusicManager.ResetMusicAfterReload();
+		m_bIsPlayerShutUp = false;
 #ifdef AUDIO_OAL
 		SampleManager.Service();
 #endif
diff --git a/src/audio/AudioManager.h b/src/audio/AudioManager.h
index d2f9bc94..7783590e 100644
--- a/src/audio/AudioManager.h
+++ b/src/audio/AudioManager.h
@@ -76,6 +76,7 @@ public:
 	uint8 m_nIndexMap[NUM_PED_COMMENTS_BANKS][NUM_PED_COMMENTS_SLOTS];
 	uint8 m_nCommentsInBank[NUM_PED_COMMENTS_BANKS];
 	uint8 m_nActiveBank;
+	uint32 field_48C;
 
 	cPedComments()
 	{
@@ -93,7 +94,7 @@ public:
 	void Process();
 };
 
-VALIDATE_SIZE(cPedComments, 1164);
+VALIDATE_SIZE(cPedComments, 0x490);
 
 class CEntity;
 
@@ -286,8 +287,8 @@ public:
 	bool HasAirBrakes(int32 model) const; // done
 
 	void Initialise(); // done
-	void InitialisePoliceRadio();
-	void InitialisePoliceRadioZones();
+	void InitialisePoliceRadio(); //done
+	void InitialisePoliceRadioZones(); //done
 	void InterrogateAudioEntities(); // done
 	bool IsAudioInitialised() const; // done
 	bool IsMissionAudioSampleFinished(uint8 slot); // done
@@ -370,17 +371,17 @@ public:
 	void ProcessEscalators();                                  // done
 	void ProcessExtraSounds();                                 // done
 
-	int32 RandomDisplacement(uint32 seed) const;                                                                                      // 
+	int32 RandomDisplacement(uint32 seed) const;                                                                                      // done
 	void ReacquireDigitalHandle() const;                                                                                              // done
 	void ReleaseDigitalHandle() const;                                                                                                // done
 	void ReportCollision(CEntity *entity1, CEntity *entity2, uint8 surface1, uint8 surface2, float collisionPower, float intensity2); // done
 	void ReportCrime(int32 crime, const CVector *pos);                                                                                // done
 	void ResetAudioLogicTimers(uint32 timer);                                                                                         // done
-	void ResetPoliceRadio();                                                                                                          // 
-	void ResetTimers(uint32 time);                                                                                                    // 
+	void ResetPoliceRadio();                                                                                                          // done
+	void ResetTimers(uint32 time);                                                                                                    // done
 
 	void Service(); //done
-	void ServiceCollisions();
+	void ServiceCollisions(); //done
 	void ServicePoliceRadio();
 	void ServicePoliceRadioChannel(int32 wantedLevel);
 	void ServiceSoundEffects();
@@ -408,13 +409,13 @@ public:
 	void SetupPedComments(cPedParams *params, uint32 sound);
 	void SetupSuspectLastSeenReport();
 
-	void Terminate();
-	void TranslateEntity(Const CVector *v1, CVector *v2) const;
+	void Terminate(); //done
+	void TranslateEntity(Const CVector *v1, CVector *v2) const; //done
 
 	void UpdateReflections();
 	bool UsesReverseWarning(int32 model) const; //done
-	bool UsesSiren(int32 model) const;
-	bool UsesSirenSwitching(int32 model) const;
+	bool UsesSiren(cVehicleParams *params) const; //done
+	bool UsesSirenSwitching(cVehicleParams* params) const; //done
 
 	CVehicle *FindVehicleOfPlayer(); //done
 	void SetPedTalkingStatus(CPed *ped, uint8 status);
diff --git a/src/audio/MusicManager.cpp b/src/audio/MusicManager.cpp
index fde92590..4653acb7 100644
--- a/src/audio/MusicManager.cpp
+++ b/src/audio/MusicManager.cpp
@@ -374,7 +374,7 @@ cMusicManager::Service()
 		field_399A = true;
 		if (!field_3999 && !AudioManager.m_nUserPause && AudioManager.m_nPreviousUserPause)
 			field_3999 = true;
-		if (AudioManager.field_5554 % 4 == 0) {
+		if (AudioManager.m_FrameCounter % 4 == 0) {
 			gNumRetunePresses = 0;
 			gRetuneCounter = 0;
 			field_2 = false;
@@ -422,7 +422,7 @@ cMusicManager::ServiceFrontEndMode()
 		m_nPlayingTrack = NO_TRACK;
 	}
 
-	if (AudioManager.field_5554 % 4 != 0) return;
+	if (AudioManager.m_FrameCounter % 4 != 0) return;
 
 	if (!field_398F && !field_3995) {
 		m_nStreamedTrack = m_nFrontendTrack;
@@ -893,7 +893,7 @@ cMusicManager::ServiceTrack(CVehicle *veh, CPed *ped)
 	{
 		field_398F = true;
 		SampleManager.SetStreamedVolumeAndPan(0, 63, 0, 0);
-		if (!(AudioManager.field_5554 & 1)) {
+		if (!(AudioManager.m_FrameCounter & 1)) {
 			if (field_3995 || !SampleManager.IsStreamPlaying(0)) {
 				bRadioStatsRecorded2 = false;
 				if (SampleManager.IsStreamPlaying(0)) {