diff --git a/installer/kernel_patches.S b/installer/kernel_patches.S
index 770977d..35e45f6 100644
--- a/installer/kernel_patches.S
+++ b/installer/kernel_patches.S
@@ -79,7 +79,13 @@
 #endif
 
 #define BAT4U_VAL                       0x008000FF
-#define BAT4L_VAL                       0x30800012
+#if VER >= 410
+    #define BAT4L_VAL                   0x30800012
+#elif VER == 400
+    #define BAT4L_VAL                   0x4E800012
+#else
+    #error Please define valid value for firmware setup.
+#endif
 
 #define SET_R4_TO_ADDR(addr)        \
     lis r3, addr@h              ;   \
diff --git a/installer/launcher.c b/installer/launcher.c
index eed8cb0..6def932 100644
--- a/installer/launcher.c
+++ b/installer/launcher.c
@@ -41,7 +41,7 @@
     #define KERN_SYSCALL_TBL_3                          0xFFE85470 // works with loader
     #define KERN_SYSCALL_TBL_4                          0xFFEAAA60 // works with home menu
     #define KERN_SYSCALL_TBL_5                          0xFFEAAE60 // works with browser (previously KERN_SYSCALL_TBL)
-#elif ( (VER == 400) || (VER == 410) )
+#elif (VER == 410)
     #define ADDRESS_OSTitle_main_entry_ptr              0x1005A8C0
     #define ADDRESS_main_entry_hook                     0x0101BD4C
 
@@ -50,8 +50,31 @@
     #define KERN_SYSCALL_TBL_3                          0xFFE85C90
     #define KERN_SYSCALL_TBL_4                          0xFFE85490
     #define KERN_SYSCALL_TBL_5                          0xFFE85890 // works with browser
+#elif (VER == 400)
+    #define ADDRESS_OSTitle_main_entry_ptr              0x1005A600
+    #define ADDRESS_main_entry_hook                     0x0101BD4C
+
+    #define KERN_SYSCALL_TBL_1                          0xFFE84C90
+    #define KERN_SYSCALL_TBL_2                          0xFFE85090
+    #define KERN_SYSCALL_TBL_3                          0xFFE85C90
+    #define KERN_SYSCALL_TBL_4                          0xFFE85490
+    #define KERN_SYSCALL_TBL_5                          0xFFE85890 // works with browser
+#else
+    #error Please define valid values for firmware.
 #endif // VER
 
+#define ROOTRPX_DBAT0U_VAL                              0xC00003FF
+#define COREINIT_DBAT0U_VAL                             0xC20001FF
+#if (VER >= 410)
+    #define ROOTRPX_DBAT0L_VAL                          0x30000012
+    #define COREINIT_DBAT0L_VAL                         0x32000012
+#elif (VER == 400)
+    #define ROOTRPX_DBAT0L_VAL                          0x4E000012
+    #define COREINIT_DBAT0L_VAL                         0x4D000012
+#else
+    #error Please define valid values for firmware.
+#endif
+
 /* Install functions */
 static void InstallMain(private_data_t *private_data);
 static void InstallPatches(private_data_t *private_data);
@@ -283,12 +306,23 @@ static void KernelCopyData(unsigned int addr, unsigned int src, unsigned int len
     /*
      * Setup a DBAT access for our 0xC0800000 area and our 0xBC000000 area which hold our variables like GAME_LAUNCHED and our BSS/rodata section
      */
-    register int dbatu0, dbatl0;
+    register unsigned int dbatu0, dbatl0, target_dbat0u, target_dbat0l;
+    // setup mapping based on target address
+    if ((addr >= 0xC0000000) && (addr < 0xC2000000)) // root.rpx address
+    {
+        target_dbat0u = ROOTRPX_DBAT0U_VAL;
+        target_dbat0l = ROOTRPX_DBAT0L_VAL;
+    }
+    else if ((addr >= 0xC2000000) && (addr < 0xC3000000))
+    {
+        target_dbat0u = COREINIT_DBAT0U_VAL;
+        target_dbat0l = COREINIT_DBAT0L_VAL;
+    }
     // save the original DBAT value
     asm volatile("mfdbatu %0, 0" : "=r" (dbatu0));
     asm volatile("mfdbatl %0, 0" : "=r" (dbatl0));
-    asm volatile("mtdbatu 0, %0" : : "r" (0xC0001FFF));
-    asm volatile("mtdbatl 0, %0" : : "r" (0x30000012));
+    asm volatile("mtdbatu 0, %0" : : "r" (target_dbat0u));
+    asm volatile("mtdbatl 0, %0" : : "r" (target_dbat0l));
     asm volatile("eieio; isync");
 
     unsigned char *src_p = (unsigned char*)src;
diff --git a/src/dynamic_libs/ax_functions.c b/src/dynamic_libs/ax_functions.c
index d84d6f8..97db459 100644
--- a/src/dynamic_libs/ax_functions.c
+++ b/src/dynamic_libs/ax_functions.c
@@ -72,3 +72,23 @@ void InitAXFunctionPointers(void)
     OS_FIND_EXPORT(sound_handle, AXSetVoiceLoopOffset);
 }
 
+void ProperlyEndTransitionAudio(void)
+{
+    bool (* check_os_audio_transition_flag_old)(void);
+    void (* AXInit_old)(void);
+    void (* AXQuit_old)(void);
+    
+    unsigned int *funcPointer = 0;
+    unsigned int sound_handle;
+    OSDynLoad_Acquire("snd_core.rpl", &sound_handle);
+    
+    OS_FIND_EXPORT_EX(sound_handle, check_os_audio_transition_flag, check_os_audio_transition_flag_old);
+    OS_FIND_EXPORT_EX(sound_handle, AXInit, AXInit_old);
+    OS_FIND_EXPORT_EX(sound_handle, AXQuit, AXQuit_old);
+    
+    if (check_os_audio_transition_flag_old())
+    {
+        AXInit_old();
+        AXQuit_old();
+    }
+}
\ No newline at end of file
diff --git a/src/dynamic_libs/ax_functions.h b/src/dynamic_libs/ax_functions.h
index df9647c..8fe8df5 100644
--- a/src/dynamic_libs/ax_functions.h
+++ b/src/dynamic_libs/ax_functions.h
@@ -31,6 +31,7 @@ extern "C" {
 #include <gctypes.h>
 
 void InitAXFunctionPointers(void);
+void ProperlyEndTransitionAudio(void);
 
 extern void (* AXInitWithParams)(u32 * params);
 extern void (* AXQuit)(void);
diff --git a/src/sounds/SoundHandler.cpp b/src/sounds/SoundHandler.cpp
index 60a55a6..93ce942 100644
--- a/src/sounds/SoundHandler.cpp
+++ b/src/sounds/SoundHandler.cpp
@@ -216,14 +216,23 @@ SoundDecoder * SoundHandler::GetSoundDecoder(const u8 * sound, int length)
 
 void SoundHandler::executeThread()
 {
+    // v2 sound lib can not properly end transition audio on old firmwares
+    if (OS_FIRMWARE <= 410)
+    {
+        ProperlyEndTransitionAudio();
+    }
+    
     //! initialize 48 kHz renderer
     u32 params[3] = { 1, 0, 0 };
     AXInitWithParams(params);
 
 
-	for(u32 i = 0; i < MAX_DECODERS; ++i)
+    // The problem with last voice on 500 was caused by it having priority 0
+    // We would need to change this priority distribution if for some reason
+    // we would need MAX_DECODERS > Voice::PRIO_MAX
+    for(u32 i = 0; i < MAX_DECODERS; ++i)
     {
-        int priority = (MAX_DECODERS - 1 - i) * (Voice::PRIO_MAX - Voice::PRIO_MIN)  / (MAX_DECODERS - 1);
+        int priority = (MAX_DECODERS - i) * Voice::PRIO_MAX  / MAX_DECODERS;
         voiceList[i] = new Voice(priority); // allocate voice 0 with highest priority
     }
 
@@ -257,15 +266,7 @@ void SoundHandler::executeThread()
     AXRegisterFrameCallback(NULL);
     AXQuit();
 
-    // deleting the last voice from the decoder produced DSI errors on 5.0.0 so we skip it
-    // expecting same behaviour on every FW below 532
-    u32 delete_skip = 0;
-    if(OS_FIRMWARE < 532)
-    {
-        delete_skip = 1;
-    }
-    
-	for(u32 i = 0; i < MAX_DECODERS - delete_skip; ++i)
+    for(u32 i = 0; i < MAX_DECODERS; ++i)
     {
         delete voiceList[i];
         voiceList[i] = NULL;
diff --git a/src/sounds/Voice.h b/src/sounds/Voice.h
index b1ad9d7..720ebc2 100644
--- a/src/sounds/Voice.h
+++ b/src/sounds/Voice.h
@@ -26,7 +26,7 @@ public:
 
     enum VoicePriorities
     {
-        PRIO_MIN = 0,
+        PRIO_MIN = 1,
         PRIO_MAX = 31
     };