Disable fretboard chord/stop side-effects in universal mode.

Ignore TM1629 keys 0-21 in universal so pad no longer changes KEY_ID or arms OutTime_Stop; keep tap-tempo and stop. Clear stale KEY_ID/PressFlag when entering universal tab.

Co-authored-by: Cursor <cursoragent@cursor.com>

Global/Global.c

@@ -680,6 +680,15 @@ void TM1629_Handle(uint8_t key)
   STRING_MIDI *MIDI;
   const STRING_MIDI *ORGAN_MIDI;
   static uint8_t Last_Tm1926D_Key = 0;
+
+  /* 万能：指板不改和弦、不启停伴奏；保留拍速/停止 */
+  if (mGuiData[GUI_TAB_INDEX].Current == 0)
+  {
+    if (key == 22) { Tap_to_Speed();  return; }
+    if (key == 23) { Stop_AutoBand(); return; }
+    return; /* 忽略 0~21：不改 KEY_ID/USE_MIDI/PressFlag，不启停 OutTime_Stop */
+  }
+
   if(BP_Transpose(key))  return;
 
   switch(key)

UI/UI_SongMode.c

@@ -280,6 +280,8 @@ void Touch_Action(int8_t FLAG, uint8_t ID, uint8_t areaIndex,uint8_t value)
                   if(mGuiData[GUI_TAB_LAST_INDEX].Current == mGuiData[ID].Current)
                           break;
                   StartFlag = 0;
+                  KEY_ID_1629 = 0;   /* 清专业等残留指板键，拨片按当前调走走向 */
+                  PressFlag = 0;
                   AutoBandTop1_Stop();
                   UI_ReloadTonePreset(); /* 切换模式必须换库，避免专业仍播万能数据 */
                 break;