diff --git a/cleo_plugins/Audio/C3DAudioStream.cpp b/cleo_plugins/Audio/C3DAudioStream.cpp
index 88861175..d7a46eb8 100644
--- a/cleo_plugins/Audio/C3DAudioStream.cpp
+++ b/cleo_plugins/Audio/C3DAudioStream.cpp
@@ -6,6 +6,8 @@ using namespace CLEO;
 
 C3DAudioStream::C3DAudioStream(const char* filepath) : CAudioStream()
 {
+    static_assert(offsetof(C3DAudioStream, streamInternal) == 4, "C3DAudioStream compatibility with CLEO4 broken!");
+
     if (isNetworkSource(filepath) && !CSoundSystem::allowNetworkSources)
     {
         TRACE("Loading of 3d-audiostream '%s' failed. Support of network sources was disabled in SA.Audio.ini", filepath);
diff --git a/cleo_plugins/Audio/CAudioStream.cpp b/cleo_plugins/Audio/CAudioStream.cpp
index 03dae03b..110ec1fc 100644
--- a/cleo_plugins/Audio/CAudioStream.cpp
+++ b/cleo_plugins/Audio/CAudioStream.cpp
@@ -6,6 +6,8 @@ using namespace CLEO;
 
 CAudioStream::CAudioStream(const char* filepath)
 {
+    static_assert(offsetof(CAudioStream, streamInternal) == 4, "CAudioStream compatibility with CLEO4 broken!");
+
     if (isNetworkSource(filepath) && !CSoundSystem::allowNetworkSources)
     {
         TRACE("Loading of audiostream '%s' failed. Support of network sources was disabled in SA.Audio.ini", filepath);
@@ -111,7 +113,7 @@ void CAudioStream::SetVolume(float value, float transitionTime)
     if (transitionTime <= 0.0)
         volume = value; // instant
     else
-        volumeTransitionStep = (volumeTarget - volume) / (1000.0 * transitionTime);
+        volumeTransitionStep = (volumeTarget - volume) / (1000.0f * transitionTime);
 }
 
 float CAudioStream::GetVolume() const
@@ -129,7 +131,7 @@ void CAudioStream::SetSpeed(float value, float transitionTime)
     if (transitionTime <= 0.0)
         speed = value; // instant
     else
-        speedTransitionStep = (speedTarget - speed) / (1000.0 * transitionTime);
+        speedTransitionStep = (speedTarget - speed) / (1000.0f * transitionTime);
 }
 
 float CAudioStream::GetSpeed() const
@@ -161,11 +163,11 @@ void CAudioStream::UpdateVolume()
     if (volume != volumeTarget)
     {
         auto timeDelta = CTimer::m_snTimeInMillisecondsNonClipped - CTimer::m_snPreviousTimeInMillisecondsNonClipped;
-        volume += volumeTransitionStep * (double)timeDelta; // animate the transition
+        volume += volumeTransitionStep * (float)timeDelta; // animate the transition
 
         // check progress
         auto remaining = volumeTarget - volume;
-        remaining *= (volumeTransitionStep > 0.0) ? 1.0 : -1.0;
+        remaining *= (volumeTransitionStep > 0.0f) ? 1.0f : -1.0f;
         if (remaining < 0.0) // overshoot
         {
             volume = volumeTarget;
@@ -188,11 +190,11 @@ void CAudioStream::UpdateSpeed()
     if (speed != speedTarget)
     {
         auto timeDelta = CTimer::m_snTimeInMillisecondsNonClipped - CTimer::m_snPreviousTimeInMillisecondsNonClipped;
-        speed += speedTransitionStep * (double)timeDelta; // animate the transition
+        speed += speedTransitionStep * (float)timeDelta; // animate the transition
 
         // check progress
         auto remaining = speedTarget - speed;
-        remaining *= (speedTransitionStep > 0.0) ? 1.0 : -1.0;
+        remaining *= (speedTransitionStep > 0.0f) ? 1.0f : -1.0f;
         if (remaining < 0.0) // overshoot
         {
             speed = speedTarget; // done
diff --git a/cleo_plugins/Audio/CAudioStream.h b/cleo_plugins/Audio/CAudioStream.h
index fdfa2b60..514084ff 100644
--- a/cleo_plugins/Audio/CAudioStream.h
+++ b/cleo_plugins/Audio/CAudioStream.h
@@ -58,14 +58,14 @@ namespace CLEO
         eStreamType type = eStreamType::SoundEffect;
         bool ok = false;
         float rate = 44100.0f; // file's sampling rate
-        double speed = 1.0f;
-        double volume = 1.0f;
+        float speed = 1.0f;
+        float volume = 1.0f;
 
         // transitions
-        double volumeTarget = 1.0f;
-        double volumeTransitionStep = 1.0f;
-        double speedTarget = 1.0f;
-        double speedTransitionStep = 1.0f;
+        float volumeTarget = 1.0f;
+        float volumeTransitionStep = 1.0f;
+        float speedTarget = 1.0f;
+        float speedTransitionStep = 1.0f;
 
         CAudioStream() = default;
         CAudioStream(const CAudioStream&) = delete; // no copying!
diff --git a/cleo_sdk/CLEO.h b/cleo_sdk/CLEO.h
index 1a1d3c83..a73a328f 100644
--- a/cleo_sdk/CLEO.h
+++ b/cleo_sdk/CLEO.h
@@ -530,7 +530,7 @@ void WINAPI CLEO_RemoveScriptDeleteDelegate(FuncScriptDeleteDelegateT func);
 
 DWORD WINAPI CLEO_GetScriptTextureById(CRunningScript* thread, int id); // ret RwTexture *
 
-DWORD WINAPI CLEO_GetInternalAudioStream(CRunningScript* thread, DWORD stream); // arg CAudioStream *
+DWORD WINAPI CLEO_GetInternalAudioStream(CRunningScript* unused, DWORD audioStreamPtr); // CAudioStream*
 
 struct StringList { DWORD count; char** strings; };
 void WINAPI CLEO_StringListFree(StringList list); // releases resources used by StringList container
diff --git a/source/CleoBase.cpp b/source/CleoBase.cpp
index a532b2af..fefc469a 100644
--- a/source/CleoBase.cpp
+++ b/source/CleoBase.cpp
@@ -252,9 +252,9 @@ namespace CLEO
         GetInstance().RemoveCallback(id, func);
     }
 
-    DWORD WINAPI CLEO_GetInternalAudioStream(CLEO::CRunningScript* thread, DWORD stream) // arg CAudioStream *
+    DWORD WINAPI CLEO_GetInternalAudioStream(CLEO::CRunningScript* unused, DWORD audioStreamPtr)
     {
-        return stream; // CAudioStream::streamInternal offset is 0
+        return *(DWORD*)(audioStreamPtr + 0x4); // CAudioStream->streamInternal
     }
 
     void WINAPI CLEO_ResolvePath(CLEO::CRunningScript* thread, char* inOutPath, DWORD pathMaxLen)