diff --git a/MyCode/App_Auto.c b/MyCode/App_Auto.c
index 19b8b36..8fa13cf 100644
--- a/MyCode/App_Auto.c
+++ b/MyCode/App_Auto.c
@@ -21,9 +21,11 @@ static uint8_t pStoreBuffer[PRESET_BUFFER_SIZE];
 
 /* ======== Bass/和弦分通道八度（无 AutoBand 源码时的输出侧映射） ========
  * 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）。I/II（键1~6）原样；III+：bass -12 地板 E1；
- * 和弦 -12 夹在 E2~#G4，超上限就近和弦内音。移调≥#F(6) 时再 -12。
- * 对照 Doc/吉他和弦表最终版.xlsx */
+ * 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+（键7~21）：bass -12 地板 E1；和弦 -12 夹在 E2~#G4；
+ *    移调≥#F 时再叠加 -12（与①同一转调表）。
+ * 对照 Doc/吉他和弦表最终版.xlsx / 转调说明表 */
 #define CHORD_REG_FIX_EN        1
 #define BASS_CH                 8    /* 日志 ch8 */
 #define DRUM_CH                 9    /* 日志 ch9 */
@@ -195,6 +197,37 @@ static int App_Auto_MapChordNote(int key, uint8_t *flags)
     return App_Auto_ClampMidi(out);
 }
 
+/* 转调说明：移调≥#F 时 I/II 也「整体-12」(bass、和弦)；不含 III+ 把位音区修正 */
+static int App_Auto_MapXposeOverall(int channel, int key, uint8_t *flags)
+{
+    int out = key - 12;
+    uint8_t f = 0x04u; /* bit2: xpose overall -12 */
+
+    if (channel == BASS_CH)
+    {
+        while (out < MIDI_E1)
+        {
+            out += 12;
+            f |= 0x02u;
+        }
+    }
+    else
+    {
+        while (out < MIDI_E2)
+        {
+            out += 12;
+            f |= 0x08u;
+        }
+        if (out > MIDI_GSHARP4)
+        {
+            out = App_Auto_NearestChordTone(out);
+            f |= 0x10u;
+        }
+    }
+    if (flags) *flags = f;
+    return App_Auto_ClampMidi(out);
+}
+
 static int App_Auto_MapNote(int channel, int key, uint8_t *flags)
 {
     int out = key;
@@ -204,13 +237,24 @@ 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_NeedRegisterFix())
-        return key;
-
-    if (channel == BASS_CH)
-        out = App_Auto_MapBassNote(key, flags);
+    if (App_Auto_NeedRegisterFix())
+    {
+        /* III+：既有把位音区修正；≥#F 时 Map* 内再叠转调 -12 */
+        if (channel == BASS_CH)
+            out = App_Auto_MapBassNote(key, flags);
+        else
+            out = App_Auto_MapChordNote(key, flags);
+    }
+    else if (App_Auto_XposeExtra())
+    {
+        /* I/II + 移调≥#F：表格「整体-12 (bass、和弦)」 */
+        out = App_Auto_MapXposeOverall(channel, key, flags);
+    }
     else
-        out = App_Auto_MapChordNote(key, flags);
+    {
+        /* I/II + 移调 C~F：正常和弦逻辑，不改八度 */
+        return key;
+    }
 #else
     (void)channel;
 #endif
@@ -249,7 +293,8 @@ static void App_Auto_LogPitch(int channel, int key, int out, uint8_t flags, int
     deg  = App_Auto_ChordDegree();
     fix  = App_Auto_NeedRegisterFix();
     xf   = App_Auto_XposeExtra();
-    pass = (!fix || channel == DRUM_CH) ? 1 : 0;
+    /* PASS = 未做任何八度映射（I/II 且移调 C~F） */
+    pass = ((!fix && !xf) || channel == DRUM_CH) ? 1 : 0;
 
     LOG_I("PITCH", "%s ch%u(%s) %d->%d d=%d deg=%d chord=%u xp=%u xf=%d fl=0x%02X %s%s%s%s",
           is_on ? "on" : "off",
diff --git a/tools/rtt_pitch_reg_test.py b/tools/rtt_pitch_reg_test.py
index 5bdf9ca..09c53f3 100644
--- a/tools/rtt_pitch_reg_test.py
+++ b/tools/rtt_pitch_reg_test.py
@@ -247,6 +247,30 @@ def map_chord(key: int, xp: int) -> tuple[int, int, bool]:
     return max(0, min(127, out)), flags, need_near
 
 
+def map_xpose_overall_bass(key: int) -> tuple[int, int]:
+    """I/II + xp>=#F: overall -12 only (mirrors App_Auto_MapXposeOverall bass)."""
+    out = key - 12
+    flags = 0x04
+    while out < MIDI_E1:
+        out += 12
+        flags |= 0x02
+    return max(0, min(127, out)), flags
+
+
+def map_xpose_overall_chord(key: int) -> tuple[int, int, bool]:
+    """I/II + xp>=#F: overall -12 only (mirrors App_Auto_MapXposeOverall chord)."""
+    out = key - 12
+    flags = 0x04
+    while out < MIDI_E2:
+        out += 12
+        flags |= 0x08
+    need_near = out > MIDI_GSHARP4
+    if need_near:
+        flags |= 0x10
+        out = MIDI_GSHARP4
+    return max(0, min(127, out)), flags, need_near
+
+
 def expect_for_event(ev: PitchEvent) -> tuple[str, bool]:
     """Return (detail, ok)."""
     if not ev.is_on:
@@ -268,6 +292,23 @@ def expect_for_event(ev: PitchEvent) -> tuple[str, bool]:
 
     fix = need_register_fix(ev.chord)
     if not fix:
+        # I/II: C~F 原样；≥#F 表格整体-12
+        if ev.xp >= XPOSE_FS:
+            if ev.ch == BASS_CH_DISP or ev.role == "bass":
+                exp, exp_fl = map_xpose_overall_bass(ev.key_in)
+                if ev.key_out != exp:
+                    return f"I/II xpose bass expect {ev.key_in}->{exp}, got {ev.key_out}", False
+                if not (ev.flags & 0x04):
+                    return f"I/II xpose bass missing xf flag fl=0x{ev.flags:02X}", False
+                return f"I/II xpose bass {ev.key_in}->{ev.key_out}", True
+            exp, exp_fl, need_near = map_xpose_overall_chord(ev.key_in)
+            if not (MIDI_E2 <= ev.key_out <= MIDI_GSHARP4):
+                return f"I/II xpose chord out {ev.key_out} not in range", False
+            if need_near:
+                return f"I/II xpose chord NEAR {ev.key_in}->{ev.key_out}", True
+            if ev.key_out != exp:
+                return f"I/II xpose chord expect {ev.key_in}->{exp}, got {ev.key_out}", False
+            return f"I/II xpose chord {ev.key_in}->{ev.key_out}", True
         if ev.key_out != ev.key_in or ev.delta != 0:
             return f"I/II should PASS {ev.key_in}->{ev.key_in}, got {ev.key_out}", False
         if "PASS" not in ev.tags and ev.flags != 0:
@@ -476,6 +517,8 @@ def run_auto(device: str, hold_s: float, report: str | None, log_path: str | Non
         sess.pump(hold_s)
 
         sess.phase_switch("I/II key2 PASS", key=2, xpose=None, hold_s=hold_s)
+        sess.phase_switch("I/II key2 xpose=#F overall-12", key=2, xpose=6, hold_s=hold_s)
+        sess.phase_switch("I/II key2 xpose=F restore", key=2, xpose=2, hold_s=hold_s)
         sess.phase_switch("III key8 -12", key=8, xpose=None, hold_s=hold_s)
         sess.phase_switch("VII key20 -12", key=20, xpose=None, hold_s=hold_s)
         sess.phase_switch("VII key20 xpose=#F", key=20, xpose=6, hold_s=hold_s)