diff --git a/hooks.asm b/hooks.asm
index a54cda4..582a31d 100755
--- a/hooks.asm
+++ b/hooks.asm
@@ -23,9 +23,9 @@ JML.l NMIHookAction
 org $0080D0 ; <- D0 - Bank00.asm : 164 (PHA : PHX : PHY : PHD : PHB)
 NMIHookReturn:
 ;--------------------------------------------------------------------------------
-;org $00821B ; <- 21B - Bank00.asm : 329 (LDA $13 : STA $2100)
-;JML.l PostNMIHookAction : NOP
-;PostNMIHookReturn:
+org $00821B ; <- 21B - Bank00.asm : 329 (LDA $13 : STA $2100)
+JML.l PostNMIHookAction : NOP
+PostNMIHookReturn:
 ;--------------------------------------------------------------------------------
 
 ;================================================================================
diff --git a/msu.asm b/msu.asm
index 0333c20..4af1caf 100644
--- a/msu.asm
+++ b/msu.asm
@@ -326,7 +326,7 @@ CheckMusicLoadRequest:
 .sfx_indoors
         LDA !REG_MUSIC_CONTROL_REQUEST : STA !REG_MUSIC_CONTROL : STZ !REG_MUSIC_CONTROL_REQUEST
     PLY : PLX : PLA : PLP
-    LDA.b #$05 : STA $012D
+    PHP : SEP #$20 : LDA.b #$05 : STA $012D : PLP
     JML Module_PreDungeon_setAmbientSfx
 ;--------------------------------------------------------------------------------