diff --git a/APP/app_log.c b/APP/app_log.c
index f782d1e..12a56c3 100644
--- a/APP/app_log.c
+++ b/APP/app_log.c
@@ -583,6 +583,38 @@ uint8_t app_log_try_command(const char *cmd)
         SEGGER_RTT_WriteString(APP_LOG_RTT_CHANNEL, "TONE_PICK_DONE\n");
         return 1U;
     }
+    /* chord notes KEY [TYPE]：当前移调下 GetChordNotesByType 的和弦音 */
+    if (strncmp(cmd, "chord notes ", 12) == 0 && cmd[12] != '\0') {
+        char *endp = NULL;
+        unsigned key = (unsigned)strtoul(cmd + 12, &endp, 10);
+        unsigned type = 0;
+        int has_type = 0;
+        uint8_t buff[4] = {0, 0, 0, 0};
+        uint8_t n, i;
+        char line[64];
+        int pos;
+        if (endp != NULL && *endp == ' ') {
+            type = (unsigned)strtoul(endp + 1, NULL, 10);
+            has_type = 1;
+        }
+        if (key < 1U || key > 21U) {
+            SEGGER_RTT_WriteString(APP_LOG_RTT_CHANNEL, "CHORD_NOTES_BAD\n");
+            return 1U;
+        }
+        if (!has_type)
+            type = chord_type_index_map[key].type;
+        n = GetChordNotesByType((uint8_t)key, (uint8_t)type, buff);
+        pos = snprintf(line, sizeof(line), "CHORD_NOTES_OK key=%u type=%u n=%u",
+                       key, type, (unsigned)n);
+        for (i = 0; i < n && pos > 0 && pos < (int)sizeof(line) - 5; i++)
+            pos += snprintf(line + pos, sizeof(line) - (size_t)pos, " %u", (unsigned)buff[i]);
+        if (pos > 0 && pos < (int)sizeof(line) - 2) {
+            line[pos++] = '\n';
+            line[pos] = '\0';
+        }
+        SEGGER_RTT_WriteString(APP_LOG_RTT_CHANNEL, line);
+        return 1U;
+    }
     /* 测试注入：chord key N（0释放 / 1~21和弦 / 22拍速 / 23停止） */
     if (strncmp(cmd, "chord key ", 10) == 0 && cmd[10] != '\0') {
         unsigned key = (unsigned)strtoul(cmd + 10, NULL, 10);
diff --git a/Global/Global.c b/Global/Global.c
index 27426af..5a25d0b 100644
--- a/Global/Global.c
+++ b/Global/Global.c
@@ -88,6 +88,109 @@ void FretChord_FillUseMidi(uint8_t key)
     USE_MIDI.Midi_6 = (uint8_t)(ORGAN_MIDI[type].Midi_6 + add);
 }
 
+/* C 大调「和弦伴奏发音顺序」，[源品位 I..VII][性质 0..8][8 音]。
+ * 0 表示该格留空，改用标准型指法从六弦生成。AM7 格原文「#C4# G3」按同列写成
+ * A2 #G3 #C4 #G3 E4 #G3 #C4 #G3。I/II 形状不走这张表（表上不需要改）。 */
+static const uint8_t ACCOMP_SEQ[7][9][8] =
+{
+    { /* I C */
+        {48,55,60,55,64,55,60,55}, {48,55,60,55,63,55,60,55},
+        {48,55,70,55,63,55,70,55}, {48,55,70,55,64,55,70,55},
+        {48,55,71,55,64,55,71,55}, {0}, {0}, {0}, {0},
+    },
+    { /* II D */
+        {50,57,62,57,66,57,62,57}, {50,57,62,57,65,57,62,57},
+        {50,57,60,57,65,57,62,57}, {50,57,60,57,66,57,60,57},
+        {50,57,61,57,66,57,61,57}, {0}, {0}, {0}, {0},
+    },
+    { /* III E */
+        {40,56,59,56,64,56,59,56}, {40,55,59,55,64,55,59,55},
+        {40,55,59,55,62,55,59,55}, {40,56,59,56,62,56,59,56},
+        {40,56,59,56,63,56,59,56}, {0}, {0}, {0}, {0},
+    },
+    { /* IV F */
+        {41,57,60,57,65,57,60,57}, {41,56,60,56,65,56,60,56},
+        {41,56,60,56,63,56,60,56}, {41,57,60,57,63,57,60,57},
+        {41,57,60,57,64,57,60,57}, {0}, {0}, {0}, {0},
+    },
+    { /* V G */
+        {43,50,59,50,67,50,59,50}, {43,50,58,50,67,50,58,50},
+        {43,50,58,50,65,50,58,50}, {43,50,59,50,65,50,59,50},
+        {43,50,59,50,66,50,59,50}, {0}, {0}, {0}, {0},
+    },
+    { /* VI A */
+        {45,57,61,57,64,57,61,57}, {45,57,60,57,64,57,60,57},
+        {45,55,60,55,64,55,60,55}, {45,55,61,55,64,55,61,55},
+        {45,56,61,56,64,56,61,56}, {0}, {0}, {0}, {0},
+    },
+    { /* VII B */
+        {47,59,63,59,66,59,63,59}, {47,59,62,59,66,59,62,59},
+        {47,54,57,54,62,54,57,54}, {47,54,57,54,63,54,57,54},
+        {47,54,58,54,63,54,58,54}, {0}, {0}, {0}, {0},
+    },
+};
+/* Sheet2 标准型指法，弦号 6=低音弦。只给发音顺序留空的性质用。 */
+static const uint8_t ACCOMP_FINGER[7][8] =
+{
+    {5,3,2,3,1,3,2,3},
+    {4,3,2,3,1,3,2,3},
+    {6,3,2,3,1,3,2,3},
+    {6,3,2,3,1,3,2,3},
+    {6,3,2,3,1,3,2,3},
+    {5,3,2,3,1,3,2,3},
+    {5,3,2,3,1,3,2,3},
+};
+
+static uint8_t Accomp_StringMidi(const STRING_MIDI *row, uint8_t string_no)
+{
+    switch (string_no)
+    {
+    case 1: return row->Midi_1;
+    case 2: return row->Midi_2;
+    case 3: return row->Midi_3;
+    case 4: return row->Midi_4;
+    case 5: return row->Midi_5;
+    default: return row->Midi_6;
+    }
+}
+
+uint8_t AccompPattern_Fill(uint8_t key, uint8_t out[8])
+{
+    uint8_t group, src, add = 0, type, i;
+    const uint8_t *seq = 0;
+
+    if (key < 1u || key > 21u)
+        return 0;
+    group = (uint8_t)((key - 1u) / 3u);
+    src = FixedKey_SourceFret(group, &add);
+    if (src < 2u)
+        return 0;
+    if (chord_type_index_map[key].PitchOffset == 2u)
+        add = (uint8_t)(add + 1u);
+    type = chord_type_index_map[key].type;
+    if (type < 9u && ACCOMP_SEQ[src][type][0] != 0u)
+        seq = ACCOMP_SEQ[src][type];
+    for (i = 0u; i < 8u; i++)
+    {
+        uint8_t n;
+        if (seq)
+            n = seq[i];
+        else
+        {
+            const STRING_MIDI *row = OrganChord_Midi_Table[src];
+            uint8_t t = type;
+            if (src < 6u && t > 8u)
+                t = 0u;
+            if (src == 6u && t > 9u)
+                t = 0u;
+            n = Accomp_StringMidi(&row[t], ACCOMP_FINGER[src][i]);
+        }
+        n = (uint8_t)(n + add);
+        out[i] = (n > 127u) ? 127u : n;
+    }
+    return 1u;
+}
+
 
   
 const LEBEL_UI UI_Label[] = {
@@ -169,7 +272,7 @@ int16_t MIC_VOL_MAP[11]= {-9000,-7000,-5000,-3000,-1000,1000,3000,5000,7000,9000
 
 uint8_t TOUCH_AREA_NUM = (sizeof(Touch_Areas)/sizeof(Touch_AreaTypeDef));
 
-const uint8_t Version[3] = {0,2,56}; /* major.minor.patch — 0.2.56: 固定调和弦音高 */
+const uint8_t Version[3] = {0,2,57}; /* major.minor.patch — 0.2.57: 伴奏发音顺序与和弦音高 */
 uint8_t Led = 8;
 /* App 已下发琴颈引导灯：拨片勿再全绿盖掉 */
 static uint8_t s_app_neck_led = 0;
@@ -2222,14 +2325,14 @@ uint8_t GetChordNotesByType(uint8_t MIDI_Index,uint8_t type,uint8_t *buff)
                           break;
           }
           break;
-          case 2: /* III：E 品位（整组低八度；M/m 三和弦带 E4） */
+          case 2: /* III：E 品位（整组低八度；三和弦不再另加 E4） */
           switch(type)
           {
                   case 0:
-                          buff[0] = 40;buff[1] = 44;buff[2] = 47;buff[3] = 64;
+                          buff[0] = 40;buff[1] = 44;buff[2] = 47;
                           break;
                   case 1:
-                          buff[0] = 40;buff[1] = 43;buff[2] = 47;buff[3] = 64;
+                          buff[0] = 40;buff[1] = 43;buff[2] = 47;
                           break;
                   case 2:
                           buff[0] = 40;buff[1] = 43;buff[2] = 47;buff[3] = 50;
@@ -2350,26 +2453,26 @@ uint8_t GetChordNotesByType(uint8_t MIDI_Index,uint8_t type,uint8_t *buff)
                   break;
           }
           break;
-          case 6: /* VII：B 品位（Bm/B7/BM7/Bad9/Bm7-5 按新表改） */
+          case 6: /* VII：B 品位（五音为 #F；Bad9 最高音为 B） */
           switch(type)
           {
               case 0:
-                  buff[0] = 47;buff[1] = 51;buff[2] = 53;
+                  buff[0] = 47;buff[1] = 51;buff[2] = 54;
                   break;
               case 1:
-                  buff[0] = 47;buff[1] = 50;buff[2] = 53;
+                  buff[0] = 47;buff[1] = 50;buff[2] = 54;
                   break;
               case 2:
                   buff[0] = 47;buff[1] = 50;buff[2] = 54;buff[3] = 57;
                   break;
               case 3:
-                  buff[0] = 47;buff[1] = 51;buff[2] = 53;buff[3] = 57;
+                  buff[0] = 47;buff[1] = 51;buff[2] = 54;buff[3] = 57;
                   break;
               case 4:
                   buff[0] = 47;buff[1] = 51;buff[2] = 54;buff[3] = 58;
                   break;
               case 5:
-                  buff[0] = 47;buff[1] = 51;buff[2] = 54;buff[3] = 60;
+                  buff[0] = 47;buff[1] = 51;buff[2] = 54;buff[3] = 59;
                   break;
               case 6:
                   buff[0] = 47;buff[1] = 50;buff[2] = 53;buff[3] = 57;
diff --git a/Global/Global.h b/Global/Global.h
index 5dda84a..161ecbc 100644
--- a/Global/Global.h
+++ b/Global/Global.h
@@ -277,6 +277,8 @@ uint8_t AppNeckLed_IsGuide(void);
 
 uint8_t GetChordNotesByType(uint8_t MIDI_Index,uint8_t type,uint8_t *buff);
 void FretChord_FillUseMidi(uint8_t key);
+/* 源品位 III~VII：按 C 大调「和弦伴奏发音顺序」填 8 音（已含固定调半音）。I/II 返回 0 */
+uint8_t AccompPattern_Fill(uint8_t key, uint8_t out[8]);
 /* 伴奏已在播时仅更新和弦音，不 Restart（快转调） */
 void Accomp_UpdatePlayingChord(void);
 /* 切模式/停键前记住专业移调与最后指板和弦 */
diff --git a/MyCode/App_Auto.c b/MyCode/App_Auto.c
index be229fc..560ee09 100644
--- a/MyCode/App_Auto.c
+++ b/MyCode/App_Auto.c
@@ -23,10 +23,11 @@ static uint8_t pStoreBuffer[PRESET_BUFFER_SIZE];
  * 代码通道（0 起，与 MIDI status 低 4 位一致）：8=bass，9=鼓；其余=和弦。
  * 日志打印同号（ch8=bass）。
  * ① 指板 I/II（键1~6）：原样；移调≥#F(6) 时表格「整体-12」(bass、和弦)。
- * ② 指板 III/IV（键7~12）：bass -12 地板 E1；和弦 -12 夹在 E2~#G4；
- *    不再叠加转调 -12（避免 G 调 III 把 B3 压回 B2 后与根音重叠）。
- * ③ 指板 V~VII（键13~21）：同②的把位 -12；移调≥#F 时再叠加 -12。
- * 对照 Doc/吉他和弦表最终版.xlsx / 转调说明表 */
+ * ② 指板 III/IV（键7~12）：bass -12 地板 E1；和弦通道改走发音顺序（见下）。
+ * ③ 指板 V~VII（键13~21）：bass 同②，移调≥#F 时 bass 再 -12。
+ * 和弦通道：源品位是 III~VII 时，不再做 -12，按 C 大调「和弦伴奏发音顺序」
+ * 逐音循环（固定调半音与六弦同一套映射）。I/II 形状仍走上面的八度规则。
+ * 对照 自动伴奏新更改和弦规则.xlsx「C大调 / 和弦伴奏发音顺序」 */
 #define CHORD_REG_FIX_EN        1
 #define BASS_CH                 8    /* 日志 ch8 */
 #define DRUM_CH                 9    /* 日志 ch9 */
@@ -44,6 +45,116 @@ static uint16_t s_ch_ever_mask = 0; /* 会话内各通道是否出现过 NoteOn
 #define PITCH_LOG_PER_FP   24
 #define BASS_LOG_PER_FP    16
 
+static void App_Auto_QueueAllNotesOffMelodic(void);
+
+/* 和弦通道发音顺序：每通道自己的拍点，NoteOff 按进入音配对 */
+static uint8_t s_seq[8];
+static uint8_t s_seq_on;
+static uint8_t s_seq_ready;
+static uint8_t s_seq_key;
+static uint8_t s_seq_type;
+static uint8_t s_seq_xp;
+static uint8_t s_seq_po;
+#define SEQ_SLOTS 12
+static uint8_t s_seq_step[16];
+static struct { uint8_t ch, in, out, used; } s_seq_slot[SEQ_SLOTS];
+
+static void App_Auto_SeqRefresh(void)
+{
+    uint8_t key = KEY_ID_1629;
+    uint8_t type = 0, po = 0;
+    uint8_t xp = (uint8_t)mGuiData[GUI_TRANSPOSE].Current;
+    uint8_t seq[8];
+    uint8_t on;
+    uint8_t i;
+
+    if (key >= 1u && key <= 21u)
+    {
+        type = chord_type_index_map[key].type;
+        po = chord_type_index_map[key].PitchOffset;
+    }
+    if (s_seq_ready && key == s_seq_key && type == s_seq_type && xp == s_seq_xp && po == s_seq_po)
+        return;
+    on = AccompPattern_Fill(key, seq);
+    s_seq_key = key;
+    s_seq_type = type;
+    s_seq_xp = xp;
+    s_seq_po = po;
+    s_seq_ready = 1u;
+    if (!on)
+    {
+        if (s_seq_on)
+            App_Auto_QueueAllNotesOffMelodic();
+        s_seq_on = 0;
+        for (i = 0u; i < SEQ_SLOTS; i++)
+            s_seq_slot[i].used = 0;
+        return;
+    }
+    if (s_seq_on)
+    {
+        uint8_t same = 1u;
+        for (i = 0u; i < 8u; i++)
+        {
+            if (s_seq[i] != seq[i])
+                same = 0u;
+        }
+        if (!same)
+            App_Auto_QueueAllNotesOffMelodic();
+    }
+    for (i = 0u; i < 8u; i++)
+        s_seq[i] = seq[i];
+    for (i = 0u; i < 16u; i++)
+        s_seq_step[i] = 0;
+    for (i = 0u; i < SEQ_SLOTS; i++)
+        s_seq_slot[i].used = 0;
+    s_seq_on = 1u;
+}
+
+/* 1 = 已用发音顺序处理（out 为最终音高） */
+static int App_Auto_MapSeq(int channel, int key, int is_on, int *out)
+{
+    int ch;
+    int i;
+
+    App_Auto_SeqRefresh();
+    if (!s_seq_on || channel == BASS_CH || channel == DRUM_CH)
+        return 0;
+    ch = channel & 15;
+    if (!is_on)
+    {
+        for (i = SEQ_SLOTS - 1; i >= 0; i--)
+        {
+            if (s_seq_slot[i].used && s_seq_slot[i].ch == (uint8_t)ch
+                && s_seq_slot[i].in == (uint8_t)key)
+            {
+                *out = s_seq_slot[i].out;
+                s_seq_slot[i].used = 0;
+                return 1;
+            }
+        }
+        *out = key;
+        return 1;
+    }
+    *out = s_seq[s_seq_step[ch] & 7u];
+    s_seq_step[ch] = (uint8_t)((s_seq_step[ch] + 1u) & 7u);
+    for (i = 0; i < SEQ_SLOTS; i++)
+    {
+        if (!s_seq_slot[i].used)
+        {
+            s_seq_slot[i].used = 1;
+            s_seq_slot[i].ch = (uint8_t)ch;
+            s_seq_slot[i].in = (uint8_t)key;
+            s_seq_slot[i].out = (uint8_t)(*out);
+            return 1;
+        }
+    }
+    s_seq_slot[0].used = 1;
+    s_seq_slot[0].ch = (uint8_t)ch;
+    s_seq_slot[0].in = (uint8_t)key;
+    s_seq_slot[0].out = (uint8_t)(*out);
+    return 1;
+}
+
 static int App_Auto_ClampMidi(int n)
 {
     if (n < 0) return 0;
@@ -229,7 +340,7 @@ static int App_Auto_MapXposeOverall(int channel, int key, uint8_t *flags)
     return App_Auto_ClampMidi(out);
 }
 
-static int App_Auto_MapNote(int channel, int key, uint8_t *flags)
+static int App_Auto_MapNote(int channel, int key, uint8_t *flags, int is_on)
 {
     int out = key;
     if (flags) *flags = 0;
@@ -238,6 +349,12 @@ static int App_Auto_MapNote(int channel, int key, uint8_t *flags)
     if (channel == DRUM_CH || key < 0 || key > 127)
         return key;
 
+    if (App_Auto_MapSeq(channel, key, is_on, &out))
+    {
+        if (flags) *flags = 0x20u; /* 发音顺序 */
+        return out;
+    }
+
     if (App_Auto_NeedRegisterFix())
     {
         /* III+：把位音区修正；V~VII 且 ≥#F 时 Map* 内再叠转调 -12 */
@@ -258,6 +375,7 @@ static int App_Auto_MapNote(int channel, int key, uint8_t *flags)
     }
 #else
     (void)channel;
+    (void)is_on;
 #endif
     return out;
 }
@@ -353,7 +471,7 @@ static int App_Auto_MapNoteOn(int channel, int key)
         s_ch_ever_mask = 0; /* 新策略周期重新报到通道 */
     }
 
-    out = App_Auto_MapNote(channel, key, &flags);
+    out = App_Auto_MapNote(channel, key, &flags, 1);
     if (channel >= 0 && channel < 16)
     {
         uint16_t bit = (uint16_t)(1u << channel);
@@ -407,7 +525,7 @@ static void Func_CallBack_NoteOff(int channel,int key)
 {
     MidiFifoItem_t midimsg;
     uint8_t flags = 0;
-    int out_key = App_Auto_MapNote(channel, key, &flags);
+    int out_key = App_Auto_MapNote(channel, key, &flags, 0);
     midimsg.msg[0] = 0x80 | (channel & 0x0F);
     midimsg.msg[1] = (uint8_t)out_key;
     midimsg.msg[2] = 0;
@@ -424,7 +542,7 @@ static void Func_CallBack_NoteOn(int channel,int key,int vel)
     if (vel == 0)
     {
         uint8_t flags = 0;
-        out_key = App_Auto_MapNote(channel, key, &flags); /* 视同 NoteOff */
+        out_key = App_Auto_MapNote(channel, key, &flags, 0); /* 视同 NoteOff */
     }
     else
         out_key = App_Auto_MapNoteOn(channel, key);
diff --git a/tools/publish_k1_release.py b/tools/publish_k1_release.py
index e4b5721..5bc7f67 100644
--- a/tools/publish_k1_release.py
+++ b/tools/publish_k1_release.py
@@ -38,7 +38,7 @@ TONE_HDR = PROJ / "project" / "inc" / "ExtFlash_Tone_Addr.h"
 IAP_DIR = REPO / "升级" / "MCU主控升级"
 OUT_ROOT = REPO / "tools" / "out"
 
-FW_VER = "0.2.56"
+FW_VER = "0.2.57"
 UI0902_RES_BASE = 0x00100000
 BOOT_FLASH_ADDR = 0x08000000
 APP_FLASH_ADDR = 0x08008000