diff --git a/build/libraries_sysmenu/boot/ARM7/src/bootAPI.c b/build/libraries_sysmenu/boot/ARM7/src/bootAPI.c
index 1f8d66cd..4f7dbb6d 100644
--- a/build/libraries_sysmenu/boot/ARM7/src/bootAPI.c
+++ b/build/libraries_sysmenu/boot/ARM7/src/bootAPI.c
@@ -309,16 +309,19 @@ static void BOOTi_RebootCallback( void** entryp, void* mem_list_v, REBOOTTarget*
 			// I2S停止（MCLKは動作継続）
 			reg_SND_SMX_CNT &= ~REG_SND_SMX_CNT_E_MASK;
 
+			// CODEC再初期化
+			CDC_Init();
+
+			// CODEC-DSモードへの遷移
             if ( isNtrMode || th->s.exFlags.codec_mode == OS_CODECMODE_NITRO )
             {
-				// （CODEC-DSモード）
+				// マイク不具合DSタイトルは音量を絞る
+	            if ( *target == REBOOT_TARGET_DS_APP )
+	            {
+                    DS_CheckSpeakerVolume( dh );
+				}
 				CDC_GoDsMode();
             }
-			else
-			{
-				// 再初期化（CODEC-TWLモード）
-				CDC_Init();
-			}
 
 			// I2S再開
 			// DSサウンド：DSP = 8:0
diff --git a/build/libraries_sysmenu/ds/ARM7/Makefile b/build/libraries_sysmenu/ds/ARM7/Makefile
index 65e08736..c959afc0 100644
--- a/build/libraries_sysmenu/ds/ARM7/Makefile
+++ b/build/libraries_sysmenu/ds/ARM7/Makefile
@@ -26,12 +26,14 @@ TWL_PROC	    	=	ARM7
 
 #----------------------------------------------------------------------------
 
-SRCDIR				=	../common/src
+SRCDIR				=	./src \
+                        ../common/src
 
 INCDIR				=	../common/include \
 						$(ROOT)/build/libraries/mb/common/include \
 
 SRCS				=	ds_wlpatch.c \
+                        ds_volume.c
 
 TARGET_LIB			=	libds_sp$(TWL_LIBSUFFIX).a
 
diff --git a/build/libraries_sysmenu/ds/ARM7/src/ds_volume.c b/build/libraries_sysmenu/ds/ARM7/src/ds_volume.c
new file mode 100644
index 00000000..7f03806c
--- /dev/null
+++ b/build/libraries_sysmenu/ds/ARM7/src/ds_volume.c
@@ -0,0 +1,86 @@
+/*---------------------------------------------------------------------------*
+  Project:  TwlIPL
+  File:     ds_volume.c
+
+  Copyright 2008 Nintendo.  All rights reserved.
+
+  These coded instructions, statements, and computer programs contain
+  proprietary information of Nintendo of America Inc. and/or Nintendo
+  Company Ltd., and are protected by Federal copyright law.  They may
+  not be disclosed to third parties or copied or duplicated in any form,
+  in whole or in part, without the prior written consent of Nintendo.
+
+  $Date::            $
+  $Rev$
+  $Author$
+ *---------------------------------------------------------------------------*/
+
+#include <twl.h>
+#include <twl/cdc.h>
+#include <sysmenu.h>
+#include <sysmenu/ds.h>
+
+/*---------------------------------------------------------------------------*
+    型宣言
+ *---------------------------------------------------------------------------*/
+
+typedef struct _DsSpecialSpeakerVolumeTitle
+{
+	u8 gamecode[6];  // NULL終端兼アライメント用に2バイト大きいサイズを与える
+	u8 rom_version;
+	u8 volume;
+} DsSpecialSpeakerVolumeTitle;
+
+/*---------------------------------------------------------------------------*
+    静的変数定義
+ *---------------------------------------------------------------------------*/
+
+static DsSpecialSpeakerVolumeTitle sList[] ATTRIBUTE_ALIGN(32) =
+{
+	{ "AKEJ", 0, 0x40 },
+	{ "ABXJ", 0, 0x40 },
+	{ "ALHJ", 0, 0x40 },
+	{ "YFSJ", 0, 0x40 },
+	{ "AY8E", 0, 0x40 },
+	{ "YONJ", 0, 0x40 },
+	{ "ACCE", 0, 0x40 },
+	{ "AN9E", 0, 0x40 },
+	{ "A5HE", 0, 0x40 },
+	{ "A5IE", 0, 0x40 },
+	{ "AMHE", 0, 0x40 },
+	{ "A3TX", 0, 0x40 },
+	{ "YCQE", 0, 0x40 },
+	{ "YBOE", 0, 0x40 },
+	{ "ADAE", 5, 0x40 },
+	{ "APAE", 5, 0x40 },
+	{ "ACZY", 0, 0x40 },
+	{ "APYJ", 0, 0x40 },
+	{ "AY7P", 0, 0x40 },
+	{ "AWHP", 0, 0x40 },
+	{ "AWHE", 0, 0x40 },
+	{ "AOIJ", 0, 0x40 },
+	{ "AOIJ", 1, 0x40 },
+	{ "YO9J", 0, 0x40 },
+	{ "YYKJ", 0, 0x40 }
+};
+
+/*---------------------------------------------------------------------------*
+    グローバル関数定義
+ *---------------------------------------------------------------------------*/
+
+void DS_CheckSpeakerVolume( void* romHeaderNTR )
+{
+	ROM_Header* dh = romHeaderNTR;
+	int i;
+	int limit = sizeof(sList)/sizeof(sList[0]);
+	for (i=0;i<limit;i++)
+	{
+		if (*(u32 *)sList[i].gamecode == *(u32 *)dh->s.game_code && 
+            sList[i].rom_version == dh->s.rom_version)
+		{
+		    CDC_WriteSpiRegisterEx( 1, REG_CDC1_SP_ANGVOL_L_ADDR, (u8)(CDC1_ANGVOL_E | sList[i].volume) );
+		    CDC_WriteSpiRegisterEx( 1, REG_CDC1_SP_ANGVOL_R_ADDR, (u8)(CDC1_ANGVOL_E | sList[i].volume) );
+			break;
+		}
+	}
+}
diff --git a/include/sysmenu/ds/common/ds.h b/include/sysmenu/ds/common/ds.h
index 479fe350..9081e3ae 100644
--- a/include/sysmenu/ds/common/ds.h
+++ b/include/sysmenu/ds/common/ds.h
@@ -29,7 +29,7 @@ extern "C" {
 #define DS_WLPATCH_COPYCODE_SIZE			(10*4)
 
 void DS_InsertWLPatch( void* romHeaderNTR );
-
+void DS_CheckSpeakerVolume( void* romHeaderNTR );
 
 #ifdef __cplusplus
 } /* extern "C" */