diff --git a/LEGO1/mxdsobject.h b/LEGO1/mxdsobject.h
index 5dfc894c..c46ee609 100644
--- a/LEGO1/mxdsobject.h
+++ b/LEGO1/mxdsobject.h
@@ -42,6 +42,7 @@ class MxDSObject : public MxCore
 
 protected:
   inline void SetType(MxDSType p_type) { this->m_type = p_type; }
+  inline MxDSType GetType() { return (MxDSType) this->m_type; }
 
 private:
   MxU32 m_sizeOnDisk;
diff --git a/LEGO1/mxdssound.cpp b/LEGO1/mxdssound.cpp
index d05f785d..cbb1c057 100644
--- a/LEGO1/mxdssound.cpp
+++ b/LEGO1/mxdssound.cpp
@@ -1,9 +1,11 @@
 #include "mxdssound.h"
 
+DECOMP_SIZE_ASSERT(MxDSSound, 0xc0)
+
 // OFFSET: LEGO1 0x100c92c0
 MxDSSound::MxDSSound()
 {
-  this->m_lastField = 0x4f;
+  this->m_volume = 0x4f;
   this->SetType(MxDSType_Sound);
 }
 
@@ -11,3 +13,50 @@ MxDSSound::MxDSSound()
 MxDSSound::~MxDSSound()
 {
 }
+
+// OFFSET: LEGO1 0x100c94c0
+void MxDSSound::CopyFrom(MxDSSound &p_dsSound)
+{
+  this->SetType(p_dsSound.GetType());
+  this->m_volume = p_dsSound.m_volume;
+}
+
+// OFFSET: LEGO1 0x100c94e0
+MxDSSound &MxDSSound::operator=(MxDSSound &p_dsSound)
+{
+  if (this == &p_dsSound)
+    return *this;
+
+  MxDSMediaAction::operator=(p_dsSound);
+  this->CopyFrom(p_dsSound);
+  return *this;
+}
+
+// OFFSET: LEGO1 0x100c95d0
+MxU32 MxDSSound::GetSizeOnDisk()
+{
+  MxU32 totalSizeOnDisk = MxDSMediaAction::GetSizeOnDisk();
+
+  this->m_sizeOnDisk = sizeof(this->m_volume);
+  return totalSizeOnDisk + 4;
+}
+
+// OFFSET: LEGO1 0x100c95a0
+void MxDSSound::Deserialize(char **p_source, MxS16 p_unk24)
+{
+  MxDSMediaAction::Deserialize(p_source, p_unk24);
+
+  this->m_volume = *(MxS32*) *p_source;
+  *p_source += sizeof(MxS32);
+}
+
+// OFFSET: LEGO1 0x100c9510
+MxDSAction *MxDSSound::Clone()
+{
+  MxDSSound *clone = new MxDSSound();
+
+  if (clone)
+    *clone = *this;
+
+  return clone;
+}
\ No newline at end of file
diff --git a/LEGO1/mxdssound.h b/LEGO1/mxdssound.h
index eca6c055..de345e51 100644
--- a/LEGO1/mxdssound.h
+++ b/LEGO1/mxdssound.h
@@ -2,7 +2,6 @@
 #define MXDSSOUND_H
 
 #include "mxdsmediaaction.h"
-#include "mxtypes.h"
 
 // VTABLE 0x100dcdd0
 // SIZE 0xc0
@@ -12,6 +11,9 @@ class MxDSSound : public MxDSMediaAction
   MxDSSound();
   virtual ~MxDSSound() override;
 
+  void CopyFrom(MxDSSound &p_dsSound);
+  MxDSSound &operator=(MxDSSound &p_dsSound);
+
   // OFFSET: LEGO1 0x100c9330
   inline virtual const char *ClassName() const override // vtable+0x0c
   {
@@ -24,10 +26,14 @@ class MxDSSound : public MxDSMediaAction
   {
     return !strcmp(name, MxDSSound::ClassName()) || MxDSMediaAction::IsA(name);
   }
+
+  virtual MxU32 GetSizeOnDisk(); // vtable+18;
+  virtual void Deserialize(char **p_source, MxS16 p_unk24); // vtable+1c;
+  virtual MxDSAction *Clone(); // vtable+2c;
+
 private:
-  MxS32 m_unkb8;
-  MxLong m_lastField; // 0xbc
+  MxU32 m_sizeOnDisk;
+  MxS32 m_volume; // 0xbc
 };
 
-
 #endif // MXDSSOUND_H