diff --git a/src/sound/CVarHandlers.cpp b/src/sound/CVarHandlers.cpp
index e8a971e..7033af5 100644
--- a/src/sound/CVarHandlers.cpp
+++ b/src/sound/CVarHandlers.cpp
@@ -61,3 +61,43 @@ bool VoiceChatOutputDriverHandler(CVar* var, const char* oldValue, const char* v
     // TODO
     WHOA_UNIMPLEMENTED(true);
 }
+
+bool AmbienceVolume_CVarCallback(CVar* var, const char* oldValue, const char* value, void* arg) {
+    // TODO
+    WHOA_UNIMPLEMENTED(true);
+}
+
+bool EnableAllSound_CVarCallback(CVar* var, const char* oldValue, const char* value, void* arg) {
+    // TODO
+    WHOA_UNIMPLEMENTED(true);
+}
+
+bool EnableAmbience_CVarCallback(CVar* var, const char* oldValue, const char* value, void* arg) {
+    // TODO
+    WHOA_UNIMPLEMENTED(true);
+}
+
+bool EnableMusic_CVarCallback(CVar* var, const char* oldValue, const char* value, void* arg) {
+    // TODO
+    WHOA_UNIMPLEMENTED(true);
+}
+
+bool EnableSFX_CVarCallback(CVar* var, const char* oldValue, const char* value, void* arg) {
+    // TODO
+    WHOA_UNIMPLEMENTED(true);
+}
+
+bool MasterVolume_CVarCallback(CVar* var, const char* oldValue, const char* value, void* arg) {
+    // TODO
+    WHOA_UNIMPLEMENTED(true);
+}
+
+bool MusicVolume_CVarCallback(CVar* var, const char* oldValue, const char* value, void* arg) {
+    // TODO
+    WHOA_UNIMPLEMENTED(true);
+}
+
+bool SFXVolume_CVarCallback(CVar* var, const char* oldValue, const char* value, void* arg) {
+    // TODO
+    WHOA_UNIMPLEMENTED(true);
+}
diff --git a/src/sound/CVarHandlers.hpp b/src/sound/CVarHandlers.hpp
index 4ffd4ce..82619d2 100644
--- a/src/sound/CVarHandlers.hpp
+++ b/src/sound/CVarHandlers.hpp
@@ -27,4 +27,20 @@ bool VoiceChatModeHandler(CVar* var, const char* oldValue, const char* value, vo
 
 bool VoiceChatOutputDriverHandler(CVar* var, const char* oldValue, const char* value, void* arg);
 
+bool AmbienceVolume_CVarCallback(CVar* var, const char* oldValue, const char* value, void* arg);
+
+bool EnableAllSound_CVarCallback(CVar* var, const char* oldValue, const char* value, void* arg);
+
+bool EnableAmbience_CVarCallback(CVar* var, const char* oldValue, const char* value, void* arg);
+
+bool EnableMusic_CVarCallback(CVar* var, const char* oldValue, const char* value, void* arg);
+
+bool EnableSFX_CVarCallback(CVar* var, const char* oldValue, const char* value, void* arg);
+
+bool MasterVolume_CVarCallback(CVar* var, const char* oldValue, const char* value, void* arg);
+
+bool MusicVolume_CVarCallback(CVar* var, const char* oldValue, const char* value, void* arg);
+
+bool SFXVolume_CVarCallback(CVar* var, const char* oldValue, const char* value, void* arg);
+
 #endif
diff --git a/src/sound/SI2.cpp b/src/sound/SI2.cpp
index 7a33abb..a839407 100644
--- a/src/sound/SI2.cpp
+++ b/src/sound/SI2.cpp
@@ -53,9 +53,7 @@ int32_t SI2::Init(int32_t a1) {
     // TODO
     // if (CmdLineGetBool(26)) {
     //     SI2::RegisterCVars();
-    //
-    //     // TODO
-    //     // sub_4D1600();
+    //     SI2::RegisterUserCVars();
     //
     //     return 17;
     // }
@@ -135,6 +133,8 @@ int32_t SI2::Init(int32_t a1) {
 
     // TODO
 
+    SI2::RegisterUserCVars();
+
     if (!a1) {
         SI2::InitSoundKitDefs();
         // TODO
@@ -702,6 +702,182 @@ void SI2::RegisterCVars() {
     );
 }
 
+void SI2::RegisterUserCVars() {
+    CVar::Register("ChatMusicVolume",
+        "music volume (0.0 to 1.0)",
+        0x0,
+        "0.3",
+        nullptr,
+        SOUND
+    );
+
+    CVar::Register(
+        "ChatSoundVolume",
+        "sound volume (0.0 to 1.0)",
+        0x0,
+        "0.4",
+        nullptr,
+        SOUND
+    );
+
+    CVar::Register(
+        "ChatAmbienceVolume",
+        "Ambience Volume (0.0 to 1.0)",
+        0x0,
+        "0.3",
+        nullptr,
+        SOUND
+    );
+
+    CVar::Register(
+        "Sound_EnableSFX",
+        "",
+        0x0,
+        "1",
+        &EnableSFX_CVarCallback,
+        SOUND
+    );
+
+    CVar::Register(
+        "Sound_EnableAmbience",
+        "Enable Ambience",
+        0x0,
+        "1",
+        &EnableAmbience_CVarCallback,
+        SOUND
+    );
+
+    CVar::Register(
+        "Sound_EnableErrorSpeech",
+        "error speech",
+        0x0,
+        "1",
+        nullptr,
+        SOUND
+    );
+
+    CVar::Register(
+        "Sound_EnableMusic",
+        "Enables music",
+        0x0,
+        "1",
+        &EnableMusic_CVarCallback,
+        SOUND
+    );
+
+    CVar::Register(
+        "Sound_EnableAllSound",
+        "",
+        0x0,
+        "1",
+        &EnableAllSound_CVarCallback,
+        SOUND
+    );
+
+    CVar::Register(
+        "Sound_MasterVolume",
+        "master volume (0.0 to 1.0)",
+        0x0,
+        "1.0",
+        &MasterVolume_CVarCallback,
+        SOUND
+    );
+
+    CVar::Register(
+        "Sound_SFXVolume",
+        "sound volume (0.0 to 1.0)",
+        0x0,
+        "1.0",
+        &SFXVolume_CVarCallback,
+        SOUND
+    );
+
+    CVar::Register(
+        "Sound_MusicVolume",
+        "music volume (0.0 to 1.0)",
+        0x0,
+        "0.4",
+        &MusicVolume_CVarCallback,
+        SOUND
+    );
+
+    CVar::Register(
+        "Sound_AmbienceVolume",
+        "Ambience Volume (0.0 to 1.0)",
+        0x0,
+        "0.6",
+        &AmbienceVolume_CVarCallback,
+        SOUND
+    );
+
+    CVar::Register(
+        "Sound_ListenerAtCharacter",
+        "lock listener at character",
+        0x0,
+        "1",
+        nullptr,
+        SOUND
+    );
+
+    CVar::Register(
+        "Sound_EnableEmoteSounds",
+        "",
+        0x0,
+        "1",
+        nullptr,
+        SOUND
+    );
+
+    CVar::Register(
+        "Sound_ZoneMusicNoDelay",
+        "",
+        0x0,
+        "0",
+        nullptr,
+        SOUND
+    );
+
+    CVar::Register(
+        "Sound_EnableArmorFoleySoundForSelf",
+        "",
+        0x0,
+        "1",
+        nullptr,
+        SOUND
+    );
+
+    CVar::Register(
+        "Sound_EnableArmorFoleySoundForOthers",
+        "",
+        0x0,
+        "1",
+        nullptr,
+        SOUND
+    );
+
+    // TODO
+
+    CVar::Register(
+        "Sound_EnablePetSounds",
+        "Enables pet sounds",
+        0x0,
+        "1",
+        nullptr,
+        SOUND
+    );
+
+    CVar::Register(
+        "Sound_EnableSoundWhenGameIsInBG",
+        "Enable Sound When Game Is In Background",
+        0x0,
+        "0",
+        nullptr,
+        SOUND
+    );
+
+    // TODO
+}
+
 void SI2::RegisterScriptFunctions() {
     for (int32_t i = 0; i < NUM_SCRIPT_FUNCTIONS_SI2; ++i) {
         FrameScript_RegisterFunction(
diff --git a/src/sound/SI2.hpp b/src/sound/SI2.hpp
index fac7f3a..f6af22a 100644
--- a/src/sound/SI2.hpp
+++ b/src/sound/SI2.hpp
@@ -28,6 +28,7 @@ class SI2 {
         static int32_t PlaySoundKit(int32_t id, int32_t a2, void* handle, SoundKitProperties* properties, int32_t a5,  void* a6, int32_t a7, int32_t a8);
         static void PlayUISound(int32_t id);
         static void RegisterCVars();
+        static void RegisterUserCVars();
         static void RegisterScriptFunctions();
         static void StartGlueMusic(const char* name);
 };