diff --git a/LEGO1/define.cpp b/LEGO1/define.cpp
index 1e403a50..82dafb7d 100644
--- a/LEGO1/define.cpp
+++ b/LEGO1/define.cpp
@@ -1,15 +1,5 @@
 #include "define.h"
 
-// GLOBAL: LEGO1 0x1010141c
-MxS32 g_mxcoreCount[101] = {0,     -6643, -5643, -5058, -4643, -4321, -4058, -3836, -3643, -3473, -3321, -3184, -3058,
-							-2943, -2836, -2736, -2643, -2556, -2473, -2395, -2321, -2251, -2184, -2120, -2058, -2000,
-							-1943, -1888, -1836, -1785, -1736, -1689, -1643, -1599, -1556, -1514, -1473, -1434, -1395,
-							-1358, -1321, -1286, -1251, -1217, -1184, -1152, -1120, -1089, -1058, -1029, -1000, -971,
-							-943,  -915,  -888,  -862,  -836,  -810,  -785,  -761,  -736,  -713,  -689,  -666,  -643,
-							-621,  -599,  -577,  -556,  -535,  -514,  -494,  -473,  -454,  -434,  -415,  -395,  -377,
-							-358,  -340,  -321,  -304,  -286,  -268,  -251,  -234,  -217,  -200,  -184,  -168,  -152,
-							-136,  -120,  -104,  -89,   -74,   -58,   -43,   -29,   -14,   0};
-
 // GLOBAL: LEGO1 0x10102048
 // STRING: LEGO1 0x10102040
 const char* g_strACTION = "ACTION";
diff --git a/LEGO1/define.h b/LEGO1/define.h
index d45d02c3..84400d36 100644
--- a/LEGO1/define.h
+++ b/LEGO1/define.h
@@ -3,7 +3,6 @@
 
 #include "mxtypes.h"
 
-extern MxS32 g_mxcoreCount[101];
 extern const char* g_parseExtraTokens;
 extern const char* g_strWORLD;
 extern const char* g_strSOUND;
diff --git a/LEGO1/omni/include/mxcore.h b/LEGO1/omni/include/mxcore.h
index dc167f2b..90fdb7b1 100644
--- a/LEGO1/omni/include/mxcore.h
+++ b/LEGO1/omni/include/mxcore.h
@@ -38,6 +38,7 @@ class MxCore {
 	// MxCore::`scalar deleting destructor'
 
 private:
+	static MxU32 g_nextCoreId;
 	MxU32 m_id; // 0x04
 };
 
diff --git a/LEGO1/omni/include/mxsoundmanager.h b/LEGO1/omni/include/mxsoundmanager.h
index 24e7111a..8d1d573d 100644
--- a/LEGO1/omni/include/mxsoundmanager.h
+++ b/LEGO1/omni/include/mxsoundmanager.h
@@ -22,7 +22,7 @@ class MxSoundManager : public MxAudioManager {
 
 	inline LPDIRECTSOUND GetDirectSound() { return m_directSound; }
 
-	MxS32 FUN_100aecf0(MxU32 p_undefined);
+	MxS32 GetAttenuation(MxU32 p_volume);
 
 protected:
 	void Init();
diff --git a/LEGO1/omni/src/audio/mxsoundmanager.cpp b/LEGO1/omni/src/audio/mxsoundmanager.cpp
index 0d9359e6..583d1dfc 100644
--- a/LEGO1/omni/src/audio/mxsoundmanager.cpp
+++ b/LEGO1/omni/src/audio/mxsoundmanager.cpp
@@ -1,6 +1,5 @@
 #include "mxsoundmanager.h"
 
-#include "define.h"
 #include "mxautolock.h"
 #include "mxmisc.h"
 #include "mxomni.h"
@@ -10,6 +9,17 @@
 
 DECOMP_SIZE_ASSERT(MxSoundManager, 0x3c);
 
+// GLOBAL LEGO1 0x10101420
+MxS32 g_volumeAttenuation[100] = {-6643, -5643, -5058, -4643, -4321, -4058, -3836, -3643, -3473, -3321, -3184, -3058,
+								  -2943, -2836, -2736, -2643, -2556, -2473, -2395, -2321, -2251, -2184, -2120, -2058,
+								  -2000, -1943, -1888, -1836, -1785, -1736, -1689, -1643, -1599, -1556, -1514, -1473,
+								  -1434, -1395, -1358, -1321, -1286, -1251, -1217, -1184, -1152, -1120, -1089, -1058,
+								  -1029, -1000, -971,  -943,  -915,  -888,  -862,  -836,  -810,  -785,  -761,  -736,
+								  -713,  -689,  -666,  -643,  -621,  -599,  -577,  -556,  -535,  -514,  -494,  -473,
+								  -454,  -434,  -415,  -395,  -377,  -358,  -340,  -321,  -304,  -286,  -268,  -251,
+								  -234,  -217,  -200,  -184,  -168,  -152,  -136,  -120,  -104,  -89,   -74,   -58,
+								  -43,   -29,   -14,   0};
+
 // FUNCTION: LEGO1 0x100ae740
 MxSoundManager::MxSoundManager()
 {
@@ -184,12 +194,15 @@ MxPresenter* MxSoundManager::FUN_100aebd0(const MxAtomId& p_atomId, MxU32 p_obje
 }
 
 // FUNCTION: LEGO1 0x100aecf0
-MxS32 MxSoundManager::FUN_100aecf0(MxU32 p_undefined)
+MxS32 MxSoundManager::GetAttenuation(MxU32 p_volume)
 {
-	if (!p_undefined) {
-		return -10000;
+	// The unit for p_volume is percent, rounded to integer.
+	// Convert to DSOUND attenuation units: -10000 (silent) to 0 (loudest).
+	if (p_volume == 0) {
+		return DSBVOLUME_MIN;
 	}
-	return g_mxcoreCount[p_undefined];
+
+	return g_volumeAttenuation[p_volume - 1];
 }
 
 // FUNCTION: LEGO1 0x100aed10
diff --git a/LEGO1/omni/src/audio/mxwavepresenter.cpp b/LEGO1/omni/src/audio/mxwavepresenter.cpp
index bd02bf8d..defb20f6 100644
--- a/LEGO1/omni/src/audio/mxwavepresenter.cpp
+++ b/LEGO1/omni/src/audio/mxwavepresenter.cpp
@@ -297,7 +297,7 @@ void MxWavePresenter::SetVolume(MxS32 p_volume)
 	m_volume = p_volume;
 	if (m_dsBuffer != NULL) {
 		MxS32 volume = p_volume * MxOmni::GetInstance()->GetSoundManager()->GetVolume() / 100;
-		MxS32 otherVolume = MxOmni::GetInstance()->GetSoundManager()->FUN_100aecf0(volume);
+		MxS32 otherVolume = MxOmni::GetInstance()->GetSoundManager()->GetAttenuation(volume);
 		m_dsBuffer->SetVolume(otherVolume);
 	}
 
diff --git a/LEGO1/omni/src/common/mxcore.cpp b/LEGO1/omni/src/common/mxcore.cpp
index 1266a1cb..c07cc51a 100644
--- a/LEGO1/omni/src/common/mxcore.cpp
+++ b/LEGO1/omni/src/common/mxcore.cpp
@@ -1,12 +1,15 @@
 #include "mxcore.h"
 
-#include "define.h"
+#include <assert.h>
+
+// GLOBAL: LEGO1 0x1010141c
+MxU32 MxCore::g_nextCoreId = 0;
 
 // FUNCTION: LEGO1 0x100ae1a0
 MxCore::MxCore()
 {
-	m_id = (MxU32) g_mxcoreCount[0];
-	g_mxcoreCount[0]++;
+	m_id = g_nextCoreId++;
+	assert(g_nextCoreId);
 }
 
 // FUNCTION: LEGO1 0x100ae1e0
@@ -17,5 +20,6 @@ MxCore::~MxCore()
 // FUNCTION: LEGO1 0x100ae1f0
 MxLong MxCore::Notify(MxParam& p_param)
 {
+	assert(0);
 	return 0;
 }