diff --git a/assets/gamefunc.lua b/assets/gamefunc.lua
index 1565ad77..e4428eb6 100644
--- a/assets/gamefunc.lua
+++ b/assets/gamefunc.lua
@@ -6,24 +6,28 @@ function sureCheck(event)
     end
 end
 
-function drawInteriorGlitch()
-    GC.replaceTransform(SCR.origin)
+function drawGlitch()
     local setc,rect=GC.setColor,GC.rectangle
     local t=love.timer.getTime()
     local cellSize=math.min(SCR.w,SCR.h)/26
+    GC.replaceTransform(SCR.origin)
     for x=0,SCR.w,cellSize do
         for y=0,SCR.h,cellSize do
             setc(1,1,1,(math.floor(t*2.6)*(x*26+62)*(y*42+24))/10%2.6%.042)
             rect('fill',x,y,cellSize,cellSize)
         end
     end
-
-    -- GC.scale(1,SCR.h)
-    -- local a=1/26
-    -- for i=0,26 do
-    --     setc(1,1,1,(math.floor(t*2.6+i/6)*(26+i))%0.026)
-    --     rect('fill',0,a*(i-t%1),SCR.w,a*.42)
-    -- end
+end
+function drawGlitch2()
+    local setc,rect=GC.setColor,GC.rectangle
+    local t=love.timer.getTime()
+    local a=1/26
+    GC.replaceTransform(SCR.origin)
+    GC.scale(1,SCR.h)
+    for i=0,26 do
+        setc(1,1,1,(math.floor(t*2.6+i/6)*(26+i))%0.0355)
+        rect('fill',0,a*(i-2.6*t%1),SCR.w,a*.355)
+    end
 end
 
 local _bgmPlaying ---@type string?
diff --git a/assets/progress.lua b/assets/progress.lua
index 8f3f3719..eb6201ba 100644
--- a/assets/progress.lua
+++ b/assets/progress.lua
@@ -206,6 +206,7 @@ function PROGRESS.applyExteriorBG() BG.set(prgs.main==3 and 'space' or 'galaxy')
 local function fuse()
     repeat TASK.yieldT(6.26) until SCN.cur~='main_in'
     FMOD.effect.keyOff('music_glitch')
+    TASK.unlock('musicroom_glitchFX')
 end
 function PROGRESS.applyInteriorBGM()
     playBgm('blank',prgs.main~=1)
diff --git a/assets/scene/keyset_in.lua b/assets/scene/keyset_in.lua
index 469cef27..1dd552cb 100644
--- a/assets/scene/keyset_in.lua
+++ b/assets/scene/keyset_in.lua
@@ -63,7 +63,7 @@ end
 function scene.overDraw()
     -- Glitch effect after III
     if PROGRESS.get('main')>=3 then
-        drawInteriorGlitch()
+        drawGlitch()
     end
 end
 
diff --git a/assets/scene/keyset_touch_in.lua b/assets/scene/keyset_touch_in.lua
index 8c302c37..13588599 100644
--- a/assets/scene/keyset_touch_in.lua
+++ b/assets/scene/keyset_touch_in.lua
@@ -52,7 +52,7 @@ function scene.draw() VCTRL.draw(true) end
 function scene.overDraw()
     -- Glitch effect after III
     if PROGRESS.get('main')>=3 then
-        drawInteriorGlitch()
+        drawGlitch()
     end
 end
 
diff --git a/assets/scene/lang_in.lua b/assets/scene/lang_in.lua
index 113e4d3e..778ccdcf 100644
--- a/assets/scene/lang_in.lua
+++ b/assets/scene/lang_in.lua
@@ -57,7 +57,7 @@ end
 function scene.overDraw()
     -- Glitch effect after III
     if PROGRESS.get('main')>=3 then
-        drawInteriorGlitch()
+        drawGlitch()
     end
 end
 
diff --git a/assets/scene/main_in.lua b/assets/scene/main_in.lua
index 8d9bc095..443cab9c 100644
--- a/assets/scene/main_in.lua
+++ b/assets/scene/main_in.lua
@@ -99,7 +99,7 @@ function scene.overDraw()
 
     -- Glitch effect after III
     if PROGRESS.get('main')>=3 then
-        drawInteriorGlitch()
+        drawGlitch()
     end
 end
 
diff --git a/assets/scene/musicroom.lua b/assets/scene/musicroom.lua
index af4b8935..0d68aacf 100644
--- a/assets/scene/musicroom.lua
+++ b/assets/scene/musicroom.lua
@@ -131,6 +131,13 @@ local function searchMusic(str)
         musicListBox:select(bestID)
     end
 end
+local function timeBomb()
+    TASK.yieldT(26)
+    if TASK.getLock('musicroom_glitchFX') then
+        FMOD.effect.keyOff('music_glitch')
+        TASK.unlock('musicroom_glitchFX')
+    end
+end
 function scene.keyDown(key,isRep)
     scene.focus(true)
     local act=KEYMAP.sys:getAction(key)
@@ -140,7 +147,7 @@ function scene.keyDown(key,isRep)
         if FMOD.music.getPlaying() then
             local now=FMOD.music.tell()
             local dur=FMOD.music.getDuration()
-            FMOD.music.seek(key=='left' and max(now-5,0) or (now+5)%dur)
+            FMOD.music.seek(act=='left' and max(now-5,0) or (now+5)%dur)
         end
     elseif key=='backspace' or key=='delete' then
         searchStr=""
@@ -183,6 +190,11 @@ function scene.keyDown(key,isRep)
         elseif key=='`' and isAltPressed() then
             noProgress=true
             scene.load()
+        elseif key=='f3' then
+            if TASK.lock('musicroom_glitchFX') then
+                FMOD.effect('music_glitch')
+                TASK.new(timeBomb)
+            end
         end
     end
     return true
@@ -331,6 +343,12 @@ function scene.draw()
     end
 end
 
+function scene.overDraw()
+    if TASK.getLock('musicroom_glitchFX') then
+        drawGlitch2()
+    end
+end
+
 scene.widgetList={
     {type='button_fill',pos={0,0},x=120,y=60,w=180,h=70,color='B',cornerR=15,sound_trigger='button_back',fontSize=40,text=backText,code=WIDGET.c_backScn'fadeHeader'},
     {type='text',pos={0,0},x=240,y=60,alignX='left',fontType='bold',fontSize=60,text=LANG'musicroom_title'},
diff --git a/assets/scene/setting_in.lua b/assets/scene/setting_in.lua
index 29bb8e4d..dc7fb91b 100644
--- a/assets/scene/setting_in.lua
+++ b/assets/scene/setting_in.lua
@@ -39,7 +39,7 @@ function scene.overDraw()
 
     -- Glitch effect after III
     if PROGRESS.get('main')>=3 then
-        drawInteriorGlitch()
+        drawGlitch()
     end
 end
 
diff --git a/assets/scene/tutorial_in.lua b/assets/scene/tutorial_in.lua
index bf41d42a..33e9e9b6 100644
--- a/assets/scene/tutorial_in.lua
+++ b/assets/scene/tutorial_in.lua
@@ -84,7 +84,7 @@ end
 function scene.overDraw()
     -- Glitch effect after III
     if PROGRESS.get('main')>=3 then
-        drawInteriorGlitch()
+        drawGlitch()
     end
 end