diff --git a/src/audio/AudioCollision.h b/src/audio/AudioCollision.h
index 0a058916..a00b16d9 100644
--- a/src/audio/AudioCollision.h
+++ b/src/audio/AudioCollision.h
@@ -35,4 +35,4 @@ public:
 	void AddCollisionToRequestedQueue();
 };
 
-VALIDATE_SIZE(cAudioCollisionManager, 852);
+VALIDATE_SIZE(cAudioCollisionManager, 0x354);
diff --git a/src/audio/AudioManager.cpp b/src/audio/AudioManager.cpp
index 1da80352..c0827040 100644
--- a/src/audio/AudioManager.cpp
+++ b/src/audio/AudioManager.cpp
@@ -510,7 +510,7 @@ cAudioManager::ComputePan(float dist, CVector *vec)
 	return Min(107, PanTable[index] + 63);
 }
 
-int32
+uint32
 cAudioManager::ComputeDopplerEffectedFrequency(uint32 oldFreq, float position1, float position2, float speedMultiplier) const
 {
 	uint32 newFreq = oldFreq;
@@ -519,11 +519,7 @@ cAudioManager::ComputeDopplerEffectedFrequency(uint32 oldFreq, float position1,
 		if (dist != 0.0f) {
 			float speedOfSource = (dist / m_nTimeSpent) * speedMultiplier;
 			if (m_fSpeedOfSound > Abs(speedOfSource)) {
-				if (speedOfSource < 0.0f) {
-					speedOfSource = Max(speedOfSource, -1.5f);
-				} else {
-					speedOfSource = Min(speedOfSource, 1.5f);
-				}
+				speedOfSource = clamp2(speedOfSource, 0.0f, 1.5f);
 				newFreq = (oldFreq * m_fSpeedOfSound) / (speedOfSource + m_fSpeedOfSound);
 			}
 		}
@@ -952,7 +948,7 @@ cAudioManager::ClearRequestedQueue()
 void
 cAudioManager::ClearActiveSamples()
 {
-	for (int32 i = 0; i < m_nActiveSamples; i++) {
+	for (uint8 i = 0; i < m_nActiveSamples; i++) {
 		m_asActiveSamples[i].m_nEntityIndex = AEHANDLE_NONE;
 		m_asActiveSamples[i].m_nCounter = 0;
 		m_asActiveSamples[i].m_nSampleIndex = NO_SAMPLE;
diff --git a/src/audio/AudioManager.h b/src/audio/AudioManager.h
index 07e5bc81..5aa507d1 100644
--- a/src/audio/AudioManager.h
+++ b/src/audio/AudioManager.h
@@ -250,14 +250,14 @@ public:
 
 	void CalculateDistance(bool &condition, float dist); //done
 	bool CheckForAnAudioFileOnCD() const;
-	void ClearActiveSamples();
-	void ClearMissionAudio(uint8 slot);
+	void ClearActiveSamples(); //done
+	void ClearMissionAudio(uint8 slot); //done
 	void ClearRequestedQueue();
-	int32 ComputeDopplerEffectedFrequency(uint32 oldFreq, float position1, float position2,
-	                                      float speedMultiplier) const;
+	uint32 ComputeDopplerEffectedFrequency(uint32 oldFreq, float position1, float position2,
+	                                      float speedMultiplier) const; //done
 	int32 ComputePan(float, CVector *);
 	uint8 ComputeVolume(uint8 emittingVolume, float soundIntensity, float distance) const;
-	int32 CreateEntity(eAudioType type, void *entity);
+	int32 CreateEntity(eAudioType type, void *entity); //done
 
 	void DestroyAllGameCreatedEntities();
 	void DestroyEntity(int32 id);
@@ -311,7 +311,7 @@ public:
 	void PreloadMissionAudio(uint8 slot, Const char *name);
 	void PreTerminateGameSpecificShutdown(); //done
 	/// processX - main logic of adding new sounds
-	void ProcessActiveQueues();
+	void ProcessActiveQueues(); //done
 	bool ProcessAirBrakes(cVehicleParams *params);
 	bool ProcessBoatEngine(cVehicleParams *params);
 	bool ProcessBoatMovingOverWater(cVehicleParams *params);
diff --git a/src/audio/PoliceRadio.h b/src/audio/PoliceRadio.h
index c01f21ce..e9a0fde0 100644
--- a/src/audio/PoliceRadio.h
+++ b/src/audio/PoliceRadio.h
@@ -43,4 +43,4 @@ public:
 	}
 };
 
-VALIDATE_SIZE(cPoliceRadioQueue, 444);
+VALIDATE_SIZE(cPoliceRadioQueue, 0x1BC);