diff --git a/LEGO1/mxdsaction.cpp b/LEGO1/mxdsaction.cpp
index e5162f89..b5cf6e75 100644
--- a/LEGO1/mxdsaction.cpp
+++ b/LEGO1/mxdsaction.cpp
@@ -5,10 +5,12 @@ MxDSAction::MxDSAction()
 {
   // TODO
   this->SetType(MxDSType_Action);
+  this->m_omni = NULL;
+  this->m_someTimingField = -0x80000000;
 }
 
-// OFFSET: LEGO1 0x100ada80 STUB
+// OFFSET: LEGO1 0x100ada80
 MxDSAction::~MxDSAction()
 {
-  // TODO
-}
+  delete this->m_unk7c;
+}
\ No newline at end of file
diff --git a/LEGO1/mxdsaction.h b/LEGO1/mxdsaction.h
index e26d28a6..155d7cc2 100644
--- a/LEGO1/mxdsaction.h
+++ b/LEGO1/mxdsaction.h
@@ -2,6 +2,7 @@
 #define MXDSACTION_H
 
 #include "mxdsobject.h"
+#include "mxomni.h"
 
 // VTABLE 0x100dc098
 // SIZE 0x94
@@ -23,33 +24,33 @@ class MxDSAction : public MxDSObject
   {
     return !strcmp(name, MxDSAction::ClassName()) || MxDSObject::IsA(name);
   }
-
-  int m_unk2c;
-  int m_unk30;
-  int m_unk34;
-  int m_unk38;
-  int m_unk3c;
-  int m_unk40;
-  int m_unk44;
-  int m_unk48;
-  int m_unk4c;
-  int m_unk50;
-  int m_unk54;
-  int m_unk58;
-  int m_unk5c;
-  int m_unk60;
-  int m_unk64;
-  int m_unk68;
-  int m_unk6c;
-  int m_unk70;
-  int m_unk74;
-  int m_unk78;
-  int m_unk7c;
-  int m_unk80;
-  int m_unk84;
-  int m_unk88;
-  int m_unk8c;
-  int m_unk90;
+private:
+  MxLong m_unk2c;
+  MxLong m_unk30;
+  MxLong m_unk34;
+  MxLong* m_unk38;
+  MxLong m_unk3c;
+  MxLong m_unk40;
+  MxLong m_unk44;
+  MxLong m_unk48;
+  MxLong m_unk4c;
+  MxLong m_unk50;
+  MxLong m_unk54;
+  MxLong m_unk58;
+  MxLong m_unk5c;
+  MxLong m_unk60;
+  MxLong m_unk64;
+  MxLong m_unk68;
+  MxLong m_unk6c;
+  MxLong m_unk70;
+  MxLong m_unk74;
+  MxLong m_unk78;
+  MxLong* m_unk7c;
+  MxLong m_unk80;
+  MxLong m_unk84;
+  MxLong m_unk88;
+  MxOmni* m_omni; // 0x8c
+  MxS32 m_someTimingField; // 0x90
 };
 
 #endif // MXDSACTION_H
diff --git a/LEGO1/mxdschunk.cpp b/LEGO1/mxdschunk.cpp
index 7ec8531c..63c43ba2 100644
--- a/LEGO1/mxdschunk.cpp
+++ b/LEGO1/mxdschunk.cpp
@@ -1,13 +1,19 @@
 #include "mxdschunk.h"
 
-// OFFSET: LEGO1 0x100be050 STUB
+// OFFSET: LEGO1 0x100be050
 MxDSChunk::MxDSChunk()
 {
-  // TODO
+  this->m_length = 0;
+  this->m_pStuff = NULL;
+  this->m_buffer = -1;
+  this->m_long1FromHeader = 0;
+  this->m_long2FromHeader = 0;
 }
 
-// OFFSET: LEGO1 0x100be170 STUB
+// OFFSET: LEGO1 0x100be170
 MxDSChunk::~MxDSChunk()
 {
-  // TODO
+  if ((this->m_length & 1) != 0) {
+    delete this->m_pStuff;
+  }
 }
diff --git a/LEGO1/mxdschunk.h b/LEGO1/mxdschunk.h
index 8758ffa3..f9b1d9d0 100644
--- a/LEGO1/mxdschunk.h
+++ b/LEGO1/mxdschunk.h
@@ -1,8 +1,11 @@
 #ifndef MXDSCHUNK_H
 #define MXDSCHUNK_H
 
-#include "mxcore.h"
 
+#include "mxcore.h"
+#include "mxtypes.h"
+
+// VTABLE 0x100dc7f8
 class MxDSChunk : public MxCore
 {
 public:
@@ -21,6 +24,13 @@ class MxDSChunk : public MxCore
   {
     return !strcmp(name, MxDSChunk::ClassName()) || MxCore::IsA(name);
   }
+private:
+  MxS16 m_length; // 0x8
+  MxLong m_buffer; // 0xc
+  MxLong m_long1FromHeader; // 0x10
+  MxLong m_long2FromHeader; // 0x14
+  void* m_pStuff; // 0x18
+  void* m_pSomething; // 0x1c
 };
 
 #endif // MXDSCHUNK_H
diff --git a/LEGO1/mxdsmediaaction.cpp b/LEGO1/mxdsmediaaction.cpp
index 5f9c1132..a8acde30 100644
--- a/LEGO1/mxdsmediaaction.cpp
+++ b/LEGO1/mxdsmediaaction.cpp
@@ -3,12 +3,19 @@
 // OFFSET: LEGO1 0x100c8b40
 MxDSMediaAction::MxDSMediaAction()
 {
-  // TODO
+  this->m_unk98 = 0;
+  this->m_unk9c = 0;
+  this->m_unka0 = 0;
+  this->m_unka4 = 0;
+  this->m_unka8 = 0;
+  this->m_unkac = 1;
+  this->m_unkb4 = 0xffffffff;
+  this->m_unkb0 = 0;
   this->SetType(MxDSType_MediaAction);
 }
 
-// OFFSET: LEGO1 0x100c8cf0 STUB
+// OFFSET: LEGO1 0x100c8cf0
 MxDSMediaAction::~MxDSMediaAction()
 {
-  // TODO
+  delete this->m_unk98;
 }
diff --git a/LEGO1/mxdsmediaaction.h b/LEGO1/mxdsmediaaction.h
index 5beb12f5..5e6a6141 100644
--- a/LEGO1/mxdsmediaaction.h
+++ b/LEGO1/mxdsmediaaction.h
@@ -1,6 +1,7 @@
 #ifndef MXDSMEDIAACTION_H
 #define MXDSMEDIAACTION_H
 
+#include "decomp.h"
 #include "mxdsaction.h"
 
 // VTABLE 0x100dcd40
@@ -23,7 +24,16 @@ class MxDSMediaAction : public MxDSAction
   {
     return !strcmp(name, MxDSMediaAction::ClassName()) || MxDSAction::IsA(name);
   }
-
+private:
+  MxS32* m_unk94;
+  MxS32* m_unk98;
+  MxS32* m_unk9c;
+  MxS32* m_unka0;
+  MxS32* m_unka4;
+  MxS32* m_unka8;
+  MxS32 m_unkac;
+  MxS32* m_unkb0;
+  MxS32 m_unkb4;
 };
 
 #endif // MXDSMEDIAACTION_H
diff --git a/LEGO1/mxdssound.cpp b/LEGO1/mxdssound.cpp
index 30894abc..d05f785d 100644
--- a/LEGO1/mxdssound.cpp
+++ b/LEGO1/mxdssound.cpp
@@ -3,7 +3,7 @@
 // OFFSET: LEGO1 0x100c92c0
 MxDSSound::MxDSSound()
 {
-  // TODO
+  this->m_lastField = 0x4f;
   this->SetType(MxDSType_Sound);
 }
 
diff --git a/LEGO1/mxdssound.h b/LEGO1/mxdssound.h
index 45a61d63..eca6c055 100644
--- a/LEGO1/mxdssound.h
+++ b/LEGO1/mxdssound.h
@@ -2,6 +2,7 @@
 #define MXDSSOUND_H
 
 #include "mxdsmediaaction.h"
+#include "mxtypes.h"
 
 // VTABLE 0x100dcdd0
 // SIZE 0xc0
@@ -23,6 +24,9 @@ class MxDSSound : public MxDSMediaAction
   {
     return !strcmp(name, MxDSSound::ClassName()) || MxDSMediaAction::IsA(name);
   }
+private:
+  MxS32 m_unkb8;
+  MxLong m_lastField; // 0xbc
 };