diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index 982d9468..4327d20a 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -100,6 +100,43 @@ jobs:
           build/LEGO1.DLL
           build/LEGO1.PDB
 
+  build-beta:
+    name: 'MSVC 4.20 (BETA10)'
+    runs-on: windows-latest
+
+    steps:
+    - uses: actions/checkout@v4
+
+    - uses: actions/checkout@v4
+      with:
+        repository: itsmattkc/msvc420
+        path: msvc420
+
+    - name: Setup cmake
+      uses: jwlawson/actions-setup-cmake@v2
+      with:
+        # Use minimum supported version
+        cmake-version: '3.15.x'
+
+    - name: Patch MSVC 4.2
+      run: |
+        tools/patch_c2.py msvc420/bin/C2.EXE
+
+    - name: Build
+      shell: cmd
+      run: |
+        call .\msvc420\bin\VCVARS32.BAT x86
+        cmake -B build -DCMAKE_BUILD_TYPE=Debug -DISLE_INCLUDE_ENTROPY=OFF -DISLE_BUILD_BETA10=ON -DISLE_BUILD_LEGO1=OFF -DISLE_BUILD_APP=OFF -DISLE_BUILD_CONFIG=OFF -G "NMake Makefiles"
+        cmake --build build
+
+    - name: Upload Artifact
+      uses: actions/upload-artifact@main
+      with:
+        name: Win32-beta
+        path: |
+          build/BETA10.DLL
+          build/BETA10.PDB
+
   verify:
     name: Verify decomp
     needs: [build, fetch-deps]
diff --git a/LEGO1/lego/legoomni/include/legomain.h b/LEGO1/lego/legoomni/include/legomain.h
index 423d715c..9246a642 100644
--- a/LEGO1/lego/legoomni/include/legomain.h
+++ b/LEGO1/lego/legoomni/include/legomain.h
@@ -180,8 +180,8 @@ class LegoOmni : public MxOmni {
 	// FUNCTION: BETA10 0x100d55c0
 	void SetExit(MxBool p_exit) { m_exit = p_exit; }
 
-	MxResult StartActionIfUnknown0x13c(MxDSAction& p_dsAction) { return m_unk0x13c ? Start(&p_dsAction) : SUCCESS; }
-	void SetUnknown13c(MxBool p_unk0x13c) { m_unk0x13c = p_unk0x13c; }
+	MxResult StartActionIfInitialized(MxDSAction& p_dsAction) { return m_initialized ? Start(&p_dsAction) : SUCCESS; }
+	void SetInitialized(MxBool p_unk0x13c) { m_initialized = p_unk0x13c; }
 
 	void CloseMainWindow() { PostMessage(m_windowHandle, WM_CLOSE, 0, 0); }
 
@@ -208,7 +208,7 @@ class LegoOmni : public MxOmni {
 	MxTransitionManager* m_transitionManager;    // 0x138
 
 public:
-	MxBool m_unk0x13c; // 0x13c
+	MxBool m_initialized; // 0x13c
 };
 
 #endif // LEGOMAIN_H
diff --git a/LEGO1/lego/legoomni/include/misc.h b/LEGO1/lego/legoomni/include/misc.h
index f9a26e8b..52fe63d9 100644
--- a/LEGO1/lego/legoomni/include/misc.h
+++ b/LEGO1/lego/legoomni/include/misc.h
@@ -52,7 +52,7 @@ void Disable(MxBool p_disable, MxU16 p_flags);
 LegoROI* FindROI(const char* p_name);
 void SetROIVisible(const char* p_name, MxBool p_visible);
 void SetUserActor(LegoPathActor* p_userActor);
-MxResult StartActionIfUnknown0x13c(MxDSAction& p_dsAction);
+MxResult StartActionIfInitialized(MxDSAction& p_dsAction);
 void DeleteAction();
 LegoWorld* FindWorld(const MxAtomId& p_atom, MxS32 p_entityid);
 MxDSAction& GetCurrentAction();
diff --git a/LEGO1/lego/legoomni/src/build/legocarbuild.cpp b/LEGO1/lego/legoomni/src/build/legocarbuild.cpp
index f50dcdfe..899ebeac 100644
--- a/LEGO1/lego/legoomni/src/build/legocarbuild.cpp
+++ b/LEGO1/lego/legoomni/src/build/legocarbuild.cpp
@@ -1230,7 +1230,7 @@ undefined4 LegoCarBuild::FUN_10024c20(MxNotificationParam* p_param)
 			jukeboxScript = JukeboxScript::c_RaceCarBuild_Music;
 		}
 
-		m_unk0x338 = SoundManager()->FUN_100aebd0(*g_jukeboxScript, jukeboxScript);
+		m_unk0x338 = SoundManager()->FindPresenter(*g_jukeboxScript, jukeboxScript);
 
 		if (m_unk0x338) {
 			BackgroundAudioManager()->SetPendingPresenter(m_unk0x338, 5, MxPresenter::e_repeating);
diff --git a/LEGO1/lego/legoomni/src/common/legoanimationmanager.cpp b/LEGO1/lego/legoomni/src/common/legoanimationmanager.cpp
index 5728c091..1b9dffcb 100644
--- a/LEGO1/lego/legoomni/src/common/legoanimationmanager.cpp
+++ b/LEGO1/lego/legoomni/src/common/legoanimationmanager.cpp
@@ -1015,7 +1015,7 @@ MxResult LegoAnimationManager::FUN_100605e0(
 		action.SetUnknown24(-1);
 		action.AppendExtra(strlen(buf) + 1, buf);
 
-		if (StartActionIfUnknown0x13c(action) == SUCCESS) {
+		if (StartActionIfInitialized(action) == SUCCESS) {
 			BackgroundAudioManager()->LowerVolume();
 			tranInfo->m_flags |= LegoTranInfo::c_bit2;
 			animInfo.m_unk0x22++;
@@ -1082,7 +1082,7 @@ MxResult LegoAnimationManager::FUN_100609f0(MxU32 p_objectId, MxMatrix* p_matrix
 	action.SetUnknown24(-1);
 	action.AppendExtra(strlen(buf) + 1, buf);
 
-	if (StartActionIfUnknown0x13c(action) == SUCCESS) {
+	if (StartActionIfInitialized(action) == SUCCESS) {
 		BackgroundAudioManager()->LowerVolume();
 		info->m_flags |= LegoTranInfo::c_bit2;
 		m_animRunning = TRUE;
@@ -1125,7 +1125,7 @@ MxResult LegoAnimationManager::StartEntityAction(MxDSAction& p_dsAction, LegoEnt
 		}
 	}
 
-	if (LegoOmni::GetInstance()->StartActionIfUnknown0x13c(p_dsAction) == SUCCESS) {
+	if (LegoOmni::GetInstance()->StartActionIfInitialized(p_dsAction) == SUCCESS) {
 		result = SUCCESS;
 	}
 
@@ -1149,7 +1149,7 @@ MxResult LegoAnimationManager::FUN_10060dc0(
 	MxResult result = FAILURE;
 	MxBool found = FALSE;
 
-	if (!Lego()->m_unk0x13c) {
+	if (!Lego()->m_initialized) {
 		return SUCCESS;
 	}
 
@@ -1186,7 +1186,7 @@ MxResult LegoAnimationManager::FUN_10060dc0(
 // FUNCTION: BETA10 0x1004206c
 void LegoAnimationManager::CameraTriggerFire(LegoPathActor* p_actor, MxBool, MxU32 p_location, MxBool p_bool)
 {
-	if (Lego()->m_unk0x13c && m_enableCamAnims && !m_animRunning) {
+	if (Lego()->m_initialized && m_enableCamAnims && !m_animRunning) {
 		LegoLocation* location = LegoNavController::GetLocation(p_location);
 
 		if (location != NULL) {
diff --git a/LEGO1/lego/legoomni/src/common/misc.cpp b/LEGO1/lego/legoomni/src/common/misc.cpp
index 6b231b56..19ff0a21 100644
--- a/LEGO1/lego/legoomni/src/common/misc.cpp
+++ b/LEGO1/lego/legoomni/src/common/misc.cpp
@@ -172,9 +172,9 @@ void SetUserActor(LegoPathActor* p_userActor)
 
 // FUNCTION: LEGO1 0x10015890
 // FUNCTION: BETA10 0x100e4d80
-MxResult StartActionIfUnknown0x13c(MxDSAction& p_dsAction)
+MxResult StartActionIfInitialized(MxDSAction& p_dsAction)
 {
-	return LegoOmni::GetInstance()->StartActionIfUnknown0x13c(p_dsAction);
+	return LegoOmni::GetInstance()->StartActionIfInitialized(p_dsAction);
 }
 
 // FUNCTION: LEGO1 0x100158b0
diff --git a/LEGO1/lego/legoomni/src/entity/legonavcontroller.cpp b/LEGO1/lego/legoomni/src/entity/legonavcontroller.cpp
index fa8158da..78d2e6d1 100644
--- a/LEGO1/lego/legoomni/src/entity/legonavcontroller.cpp
+++ b/LEGO1/lego/legoomni/src/entity/legonavcontroller.cpp
@@ -896,7 +896,7 @@ MxLong LegoNavController::Notify(MxParam& p_param)
 					break;
 				case 'A':
 					if (g_animationCalcStep == 1) {
-						Lego()->m_unk0x13c = TRUE;
+						Lego()->m_initialized = TRUE;
 						AnimationManager()->FUN_10060570(TRUE);
 						g_animationCalcStep = 0;
 					}
diff --git a/LEGO1/lego/legoomni/src/main/legomain.cpp b/LEGO1/lego/legoomni/src/main/legomain.cpp
index 0da66855..932ae247 100644
--- a/LEGO1/lego/legoomni/src/main/legomain.cpp
+++ b/LEGO1/lego/legoomni/src/main/legomain.cpp
@@ -71,7 +71,7 @@ void LegoOmni::Init()
 	m_animationManager = NULL;
 	m_buildingManager = NULL;
 	m_bkgAudioManager = NULL;
-	m_unk0x13c = TRUE;
+	m_initialized = TRUE;
 	m_transitionManager = NULL;
 }
 
diff --git a/LEGO1/lego/legoomni/src/worlds/legoact2.cpp b/LEGO1/lego/legoomni/src/worlds/legoact2.cpp
index f31c187e..9d088e3b 100644
--- a/LEGO1/lego/legoomni/src/worlds/legoact2.cpp
+++ b/LEGO1/lego/legoomni/src/worlds/legoact2.cpp
@@ -1116,7 +1116,7 @@ MxResult LegoAct2::FUN_10052560(
 				action.SetDirection(*p_direction);
 			}
 
-			StartActionIfUnknown0x13c(action);
+			StartActionIfInitialized(action);
 		}
 		else {
 			MxMatrix matrix;
diff --git a/LEGO1/omni/include/mxsoundmanager.h b/LEGO1/omni/include/mxsoundmanager.h
index 36568ef3..3d25856b 100644
--- a/LEGO1/omni/include/mxsoundmanager.h
+++ b/LEGO1/omni/include/mxsoundmanager.h
@@ -25,7 +25,7 @@ class MxSoundManager : public MxAudioManager {
 
 	MxS32 GetAttenuation(MxU32 p_volume);
 
-	MxPresenter* FUN_100aebd0(const MxAtomId& p_atomId, MxU32 p_objectId);
+	MxPresenter* FindPresenter(const MxAtomId& p_atomId, MxU32 p_objectId);
 
 protected:
 	void Init();
diff --git a/LEGO1/omni/src/audio/mxsoundmanager.cpp b/LEGO1/omni/src/audio/mxsoundmanager.cpp
index e77e9f93..1e2b28a1 100644
--- a/LEGO1/omni/src/audio/mxsoundmanager.cpp
+++ b/LEGO1/omni/src/audio/mxsoundmanager.cpp
@@ -179,7 +179,7 @@ void MxSoundManager::SetVolume(MxS32 p_volume)
 }
 
 // FUNCTION: LEGO1 0x100aebd0
-MxPresenter* MxSoundManager::FUN_100aebd0(const MxAtomId& p_atomId, MxU32 p_objectId)
+MxPresenter* MxSoundManager::FindPresenter(const MxAtomId& p_atomId, MxU32 p_objectId)
 {
 	AUTOLOCK(m_criticalSection);