diff --git a/APP/app_tm1629.c b/APP/app_tm1629.c
index 309af2a..4b45cb1 100644
--- a/APP/app_tm1629.c
+++ b/APP/app_tm1629.c
@@ -3,7 +3,7 @@
 static uint8_t  key_last = KEY_NONE;
 
 
-/* LED 期望颜色缓存：索引 = LedNum_TypeDef（0~7），COLOR_OTHER 表示灭 */
+/* LED ??????????棺???? = LedNum_TypeDef??0~7????COLOR_OTHER ????? */
 //static LedColor_TypeDef led_cache[8] = {
 //    COLOR_OTHER, COLOR_OTHER, COLOR_OTHER, COLOR_OTHER,
 //    COLOR_OTHER, COLOR_OTHER, COLOR_OTHER, COLOR_OTHER
@@ -31,9 +31,14 @@ uint8_t app_tm1629_Scan_Key(void)
   if(key != key_last)
   {
     key_last = key;
-    LOG_I("KEY", "tm1629 key=%u", (unsigned)key);
+    if(key >= 1 && key <= 21)
+        LOG_I("KEY", "tm1629 key=%u pitch=%u type=%u", (unsigned)key,
+              (unsigned)chord_type_index_map[key].PitchOffset,
+              (unsigned)chord_type_index_map[key].type);
+    else
+        LOG_I("KEY", "tm1629 key=%u", (unsigned)key);
     TM1629_Handle(key);
-    return key; 
+    return key;
   }
   return KEY_NONE;
 }
diff --git a/MyCode/App_Auto.c b/MyCode/App_Auto.c
index 63befd7..7d5ebdf 100644
--- a/MyCode/App_Auto.c
+++ b/MyCode/App_Auto.c
@@ -19,6 +19,64 @@ static uint8_t pStoreBuffer[PRESET_BUFFER_SIZE];
 //static uint8_t* pStoreBuffer;
 #define DEFAULT_TEMPO 100
 
+/* ======== 璺嚎A锛�#IV 闄嶅叓搴︽嫤鎴紙闊冲笀搴撴敮鎸佸叓搴﹀墠鐨勪复鏃舵柟妗堬級 ========
+ * AutoBand 搴撳杈撳叆闊崇鍙仛闊崇骇璇嗗埆锛岃緭鍑洪煶鍖虹敱鍏跺唴閮� octaveBase 鍐冲畾锛�
+ * 鍥轰欢渚у湪 GetChordNotesByType 閲岀殑浣庡叓搴﹁璁′笉鍙惉銆傛晠鍦ㄥ紩鎿庤緭鍑哄洖璋冨
+ * 鎸夊綋鍓嶅拰寮︾姸鎬佸鏃嬪緥閫氶亾鍋氭潯浠舵�у叓搴﹀亸绉伙紱闊冲笀鏂板簱鍒颁綅鍚庢暣浣撶Щ闄ゃ�� */
+#define CHORD_OCTAVE_INTERCEPT_EN   1
+#define DRUM_CHANNEL                9   /* 榧撻�氶亾涓嶇Щ璋� */
+
+/* 褰撳墠鐢熸晥鐨勫叓搴﹀亸绉伙紙0 鎴� -12锛夈�俁AM 浣欓噺鏋佸皬锛屼笉鐢ㄦ寜闊崇琛細
+ * 鐘舵�佺炕杞灛闂村厛鍚戞棆寰嬮�氶亾琛� CC123(All Notes Off) 娓呮帀鏃ч煶鍖虹殑闊筹紝
+ * 涔嬪悗 NoteOff 缁熶竴鎸夊綋鍓嶅亸绉昏繕鍘熷嵆鍙紝涓嶄細鎸傞煶銆� */
+static int8_t s_chord_octave_shift = 0;
+
+static int8_t App_Auto_TargetChordOctaveShift(void)
+{
+#if CHORD_OCTAVE_INTERCEPT_EN
+    /* 涓� GetChordNotesByType 鐨勬牴闊冲叓搴﹁璁″榻愶紙鏁存浼村鍘嬩竴涓叓搴︼級锛�
+     * V/VI/VII锛堥敭 13~21锛夋牴闊虫湰灏卞湪浣庡叓搴︼紙43/45/47锛夛紱
+     * #IV锛堥敭 10~12 + Pitch 鍗囷級鏁寸粍浣庡叓搴︼紝涓烘渶浣庨煶銆�
+     * 寮曟搸鍙闊崇骇涓嶈鍏害锛屾晠鍦ㄨ緭鍑轰晶缁熶竴琛� -12銆� */
+    if (KEY_ID_1629 >= 13 && KEY_ID_1629 <= 21)
+        return -12;
+    if (KEY_ID_1629 >= 10 && KEY_ID_1629 <= 12 &&
+        chord_type_index_map[KEY_ID_1629].PitchOffset == 2)
+        return -12;
+#endif
+    return 0;
+}
+
+static void App_Auto_QueueAllNotesOff(void)
+{
+    MidiFifoItem_t m;
+    for (int ch = 0; ch < 16; ch++)
+    {
+        if (ch == DRUM_CHANNEL) continue;
+        m.msg[0] = 0xB0 | ch;
+        m.msg[1] = 123;  /* CC123 All Notes Off */
+        m.msg[2] = 0;
+        m.msglen = 3;
+        mymidififo_InQueue(&m_MidiSendFifo,&m);
+    }
+}
+
+/* NoteOn 璺緞璋冪敤锛氬亸绉荤姸鎬佺炕杞椂鍏堟竻鏃ч煶锛屽啀杩斿洖鏂板亸绉� */
+static int8_t App_Auto_ShiftForNoteOn(void)
+{
+    int8_t target = App_Auto_TargetChordOctaveShift();
+    if (target != s_chord_octave_shift)
+    {
+        LOG_I("OCT", "shift %d->%d chord=%u pitch=%u",
+              (int)s_chord_octave_shift, (int)target,
+              (unsigned)KEY_ID_1629,
+              (unsigned)chord_type_index_map[KEY_ID_1629].PitchOffset);
+        App_Auto_QueueAllNotesOff();
+        s_chord_octave_shift = target;
+    }
+    return s_chord_octave_shift;
+}
+
 static void Func_CallBack_ProgramChange(int channel, int program)
 {
     MidiFifoItem_t midimsg;
@@ -32,8 +90,15 @@ static void Func_CallBack_ProgramChange(int channel, int program)
 static void Func_CallBack_NoteOff(int channel,int key)
 {
     MidiFifoItem_t midimsg;
-    midimsg.msg[0] = 0x80 | channel;
-    midimsg.msg[1] = key;
+    int out_key = key;
+    if (channel != DRUM_CHANNEL && key >= 0 && key < 128)
+    {
+        /* 鎸夊綋鍓嶅亸绉昏繕鍘燂紱鍋忕Щ缈昏浆鐬棿鐨勬棫闊冲凡鐢� CC123 娓呮帀 */
+        out_key = key + s_chord_octave_shift;
+        if (out_key < 0 || out_key > 127) out_key = key;
+    }
+    midimsg.msg[0] = 0x80 | (channel & 0x0F);
+    midimsg.msg[1] = (uint8_t)out_key;
     midimsg.msg[2] = 0;
     midimsg.msglen = 3;
     mymidififo_InQueue(&m_MidiSendFifo,&midimsg);
@@ -43,9 +108,17 @@ static void Func_CallBack_NoteOff(int channel,int key)
 static void Func_CallBack_NoteOn(int channel,int key,int vel)
 {
     MidiFifoItem_t midimsg;
-    midimsg.msg[0] = 0x90 | channel;
-    midimsg.msg[1] = key;
-    midimsg.msg[2] = vel;
+    int out_key = key;
+    if (channel != DRUM_CHANNEL && key >= 0 && key < 128)
+    {
+        int8_t shift = (vel == 0) ? s_chord_octave_shift   /* vel=0 瑙嗗悓 NoteOff */
+                                  : App_Auto_ShiftForNoteOn();
+        out_key = key + shift;
+        if (out_key < 0 || out_key > 127) out_key = key;
+    }
+    midimsg.msg[0] = 0x90 | (channel & 0x0F);
+    midimsg.msg[1] = (uint8_t)out_key;
+    midimsg.msg[2] = (uint8_t)vel;
     midimsg.msglen = 3;
     mymidififo_InQueue(&m_MidiSendFifo,&midimsg);
 
@@ -135,6 +208,7 @@ static int Func_CallBack_ReadFlash(int address,int length,uint8_t* pOutput)
 //
 void App_Auto_Init(void)
 {
+    LOG_I("OCT", "intercept build 20260910 en=%d", (int)CHORD_OCTAVE_INTERCEPT_EN);
     AutoBandTop1_SetPresetStoreBuffer(pStoreBuffer,PRESET_BUFFER_SIZE);
     AutoBandTop1_Init();
     AutoBandTop1_RegisterCallBack_NoteOn(Func_CallBack_NoteOn);