diff --git a/src/audio/MusicManager.cpp b/src/audio/MusicManager.cpp
index 5c1414ad..fde92590 100644
--- a/src/audio/MusicManager.cpp
+++ b/src/audio/MusicManager.cpp
@@ -161,10 +161,10 @@ cMusicManager::SetStartingTrackPositions(uint8 isNewGameTimer)
 			if (i < STREAMED_SOUND_CITY_AMBIENT && isNewGameTimer)
 				m_aTracks[i].m_nPosition = NewGameRadioTimers[i];
 			else if (i < STREAMED_SOUND_ANNOUNCE_BRIDGE_CLOSED)
-				m_aTracks[i].m_nPosition = pos * AudioManager.GetRandomNumber(i % 5) % m_aTracks[i].m_nLength;
+				m_aTracks[i].m_nPosition = (pos * AudioManager.GetRandomNumber(i % 5)) % m_aTracks[i].m_nLength;
 			else
 				m_aTracks[i].m_nPosition = 0;
-
+			
 			m_aTracks[i].m_nLastPosCheckTimer = CTimer::GetTimeInMillisecondsPauseMode();
 		}
 	}
@@ -1311,4 +1311,4 @@ cMusicManager::ChangeRadioChannel()
 
 // these two are empty
 void cMusicManager::Enable() {}
-void cMusicManager::Disable() {}
\ No newline at end of file
+void cMusicManager::Disable() {}
diff --git a/src/audio/oal/stream.cpp b/src/audio/oal/stream.cpp
index 23a0a0c9..2f392264 100644
--- a/src/audio/oal/stream.cpp
+++ b/src/audio/oal/stream.cpp
@@ -162,13 +162,13 @@ public:
 	void Seek(uint32 milliseconds)
 	{
 		if ( !IsOpened() ) return;
-		mpg123_seek(m_pMH, ms2samples(milliseconds)*GetSampleSize(), SEEK_SET);
+		mpg123_seek(m_pMH, ms2samples(milliseconds), SEEK_SET);
 	}
 	
 	uint32 Tell()
 	{
 		if ( !IsOpened() ) return 0;
-		return samples2ms(mpg123_tell(m_pMH)/GetSampleSize());
+		return samples2ms(mpg123_tell(m_pMH));
 	}
 	
 	uint32 Decode(void *buffer)
@@ -254,13 +254,13 @@ public:
 	void Seek(uint32 milliseconds)
 	{
 		if ( !IsOpened() ) return;
-		op_pcm_seek(m_FileH, ms2samples(milliseconds) * GetSampleSize());
+		op_pcm_seek(m_FileH, ms2samples(milliseconds) / GetChannels());
 	}
 	
 	uint32 Tell()
 	{
 		if ( !IsOpened() ) return 0;
-		return samples2ms(op_pcm_tell(m_FileH)/GetSampleSize());
+		return samples2ms(op_pcm_tell(m_FileH) * GetChannels());
 	}
 	
 	uint32 Decode(void *buffer)
@@ -515,8 +515,8 @@ uint32 CStream::GetPosMS()
 	alGetSourcei(m_alSource, AL_BYTE_OFFSET, &offset);
 
 	return m_pSoundFile->Tell()
-		- m_pSoundFile->samples2ms(m_pSoundFile->GetBufferSamples() * (NUM_STREAMBUFFERS-1))
-		+ m_pSoundFile->samples2ms(offset/m_pSoundFile->GetSampleSize());
+		- m_pSoundFile->samples2ms(m_pSoundFile->GetBufferSamples() * (NUM_STREAMBUFFERS-1)) / m_pSoundFile->GetChannels()
+		+ m_pSoundFile->samples2ms(offset/m_pSoundFile->GetSampleSize()) / m_pSoundFile->GetChannels();
 }
 
 uint32 CStream::GetLengthMS()
diff --git a/src/audio/oal/stream.h b/src/audio/oal/stream.h
index 456c080a..2476abcc 100644
--- a/src/audio/oal/stream.h
+++ b/src/audio/oal/stream.h
@@ -24,12 +24,12 @@ public:
 	
 	uint32 ms2samples(uint32 ms)
 	{
-		return float(ms) / 1000.0f * float(GetChannels()) * float(GetSampleRate());
+		return float(ms) / 1000.0f * float(GetSampleRate());
 	}
 	
 	uint32 samples2ms(uint32 sm)
 	{
-		return float(sm) * 1000.0f / float(GetChannels()) / float(GetSampleRate());
+		return float(sm) * 1000.0f / float(GetSampleRate());
 	}
 	
 	uint32 GetBufferSamples()
@@ -108,4 +108,4 @@ public:
 	void ProviderTerm();
 };
 
-#endif
\ No newline at end of file
+#endif
diff --git a/src/audio/sampman_oal.cpp b/src/audio/sampman_oal.cpp
index 94e653b1..d0b88245 100644
--- a/src/audio/sampman_oal.cpp
+++ b/src/audio/sampman_oal.cpp
@@ -27,6 +27,7 @@
 #include "MusicManager.h"
 #include "Frontend.h"
 #include "Timer.h"
+#include "crossplatform.h"
 #ifdef AUDIO_OPUS
 #include <opusfile.h>
 #endif
@@ -1462,11 +1463,11 @@ cSampleManager::InitialiseSampleBanks(void)
 {
 	int32 nBank = SFX_BANK_0;
 	
-	fpSampleDescHandle = fopen(SampleBankDescFilename, "rb");
+	fpSampleDescHandle = fcaseopen(SampleBankDescFilename, "rb");
 	if ( fpSampleDescHandle == NULL )
 		return false;
 #ifndef AUDIO_OPUS
-	fpSampleDataHandle = fopen(SampleBankDataFilename, "rb");
+	fpSampleDataHandle = fcaseopen(SampleBankDataFilename, "rb");
 	if ( fpSampleDataHandle == NULL )
 	{
 		fclose(fpSampleDescHandle);