diff --git a/.idea/workspace.xml b/.idea/workspace.xml
index 176b679..d2caabd 100644
--- a/.idea/workspace.xml
+++ b/.idea/workspace.xml
@@ -20,19 +20,8 @@
     </configurations>
   </component>
   <component name="ChangeListManager">
-    <list default="true" id="cea36e80-e289-4d69-9030-7186d540ac0e" name="更改" comment="fix https://github.com/losehu/uv-k5-firmware-chinese/issues/4">
+    <list default="true" id="cea36e80-e289-4d69-9030-7186d540ac0e" name="更改" comment="修复切换调制模式时亚音消失问题">
       <change beforePath="$PROJECT_DIR$/.idea/workspace.xml" beforeDir="false" afterPath="$PROJECT_DIR$/.idea/workspace.xml" afterDir="false" />
-      <change beforePath="$PROJECT_DIR$/app/app.c" beforeDir="false" afterPath="$PROJECT_DIR$/app/app.c" afterDir="false" />
-      <change beforePath="$PROJECT_DIR$/app/menu.c" beforeDir="false" afterPath="$PROJECT_DIR$/app/menu.c" afterDir="false" />
-      <change beforePath="$PROJECT_DIR$/app/uart.c" beforeDir="false" afterPath="$PROJECT_DIR$/app/uart.c" afterDir="false" />
-      <change beforePath="$PROJECT_DIR$/board.c" beforeDir="false" afterPath="$PROJECT_DIR$/board.c" afterDir="false" />
-      <change beforePath="$PROJECT_DIR$/board.h" beforeDir="false" afterPath="$PROJECT_DIR$/board.h" afterDir="false" />
-      <change beforePath="$PROJECT_DIR$/main.c" beforeDir="false" afterPath="$PROJECT_DIR$/main.c" afterDir="false" />
-      <change beforePath="$PROJECT_DIR$/radio.c" beforeDir="false" afterPath="$PROJECT_DIR$/radio.c" afterDir="false" />
-      <change beforePath="$PROJECT_DIR$/settings.c" beforeDir="false" afterPath="$PROJECT_DIR$/settings.c" afterDir="false" />
-      <change beforePath="$PROJECT_DIR$/settings.h" beforeDir="false" afterPath="$PROJECT_DIR$/settings.h" afterDir="false" />
-      <change beforePath="$PROJECT_DIR$/ui/main.c" beforeDir="false" afterPath="$PROJECT_DIR$/ui/main.c" afterDir="false" />
-      <change beforePath="$PROJECT_DIR$/ui/menu.c" beforeDir="false" afterPath="$PROJECT_DIR$/ui/menu.c" afterDir="false" />
     </list>
     <option name="SHOW_DIALOG" value="false" />
     <option name="HIGHLIGHT_CONFLICTS" value="true" />
@@ -136,7 +125,7 @@
       <workItem from="1701325367312" duration="22657000" />
       <workItem from="1701413653518" duration="3544000" />
       <workItem from="1701430185864" duration="10115000" />
-      <workItem from="1701559895523" duration="1725000" />
+      <workItem from="1701559895523" duration="3042000" />
     </task>
     <task id="LOCAL-00001" summary="bug fix">
       <created>1701136012311</created>
@@ -271,7 +260,14 @@
       <option name="project" value="LOCAL" />
       <updated>1701484068802</updated>
     </task>
-    <option name="localTasksCounter" value="20" />
+    <task id="LOCAL-00020" summary="修复切换调制模式时亚音消失问题">
+      <created>1701562094909</created>
+      <option name="number" value="00020" />
+      <option name="presentableId" value="LOCAL-00020" />
+      <option name="project" value="LOCAL" />
+      <updated>1701562094909</updated>
+    </task>
+    <option name="localTasksCounter" value="21" />
     <servers />
   </component>
   <component name="TypeScriptGeneratedFilesManager">
@@ -294,6 +290,7 @@
     <MESSAGE value="fix bug" />
     <MESSAGE value="掃描下翻譯" />
     <MESSAGE value="fix https://github.com/losehu/uv-k5-firmware-chinese/issues/4" />
-    <option name="LAST_COMMIT_MESSAGE" value="fix https://github.com/losehu/uv-k5-firmware-chinese/issues/4" />
+    <MESSAGE value="修复切换调制模式时亚音消失问题" />
+    <option name="LAST_COMMIT_MESSAGE" value="修复切换调制模式时亚音消失问题" />
   </component>
 </project>
\ No newline at end of file
diff --git a/app/app.c b/app/app.c
index 2c08ca4..93f9c52 100644
--- a/app/app.c
+++ b/app/app.c
@@ -1786,15 +1786,11 @@ static void ProcessKey(KEY_Code_t Key, bool bKeyPressed, bool bKeyHeld)
             // KEY_MENU has a special treatment here, because we want to pass hold event to ACTION_Handle
             // but we don't want it to complain when initial press happens
             // we want to react on realese instead
-        else if (        // pass side buttons
-                 !(Key == KEY_SIDE1 && !bKeyHeld)) // pass KEY_MENU held
+        else if (Key != KEY_SIDE1 && Key != KEY_SIDE2 &&        // pass side buttons
+                 !(Key == KEY_MENU && bKeyHeld)) // pass KEY_MENU held
         {
-//            if (!(Key == KEY_SIDE1&&bKeyHeld)&&(!bKeyPressed  || (Key == KEY_SIDE1 && bKeyPressed)) && // prevent released or held, prevent KEY_MENU pressed
-//                !(Key == KEY_SIDE1 && !bKeyPressed))  // pass KEY_MENU released
-//                return;
-            if (!(Key == KEY_SIDE1)  && !(bKeyPressed != 0))
-
-          //  if (Key == KEY_SIDE1 == 0 && !bKeyPressed != 0)  // pass KEY_MENU released
+            if ((!bKeyPressed || bKeyHeld || (Key == KEY_MENU && bKeyPressed)) && // prevent released or held, prevent KEY_MENU pressed
+                !(Key == KEY_MENU && !bKeyPressed))  // pass KEY_MENU released
                 return;
 
             // keypad is locked, tell the user