diff --git a/zsnes/src/cpu/dspproc.asm b/zsnes/src/cpu/dspproc.asm
index d6aed6ce..bb3545fb 100644
--- a/zsnes/src/cpu/dspproc.asm
+++ b/zsnes/src/cpu/dspproc.asm
@@ -5355,39 +5355,6 @@ NEWSYM handlersbseg
     dec ecx
     jnz .loopb
     jmp .sbend
-%ifdef _I_LIKE_SUCKY_FILTERS_          ;bwahaha
-.surroundstereo
-    shr ecx,1
-.loopbs
-    mov eax,[esi]
-    cmp eax,-32768
-    jge .noneg3s
-    mov eax,-32768
-.noneg3s
-    cmp eax,32767
-    jle .noneg4s
-    mov eax,32767
-.noneg4s
-    xor ah,80h
-    mov [es:edi],ah
-    mov eax,[esi+4]
-    cmp eax,-32768
-    jge .noneg3s2
-    mov eax,-32768
-.noneg3s2
-    cmp eax,32767
-    jle .noneg4s2
-    mov eax,32767
-.noneg4s2
-    neg ah
-    xor ah,80h
-    mov [es:edi+1],ah
-    add esi,8
-    add edi,2
-    dec ecx
-    jnz .loopbs
-    jmp .sbend
-%endif
 .surroundmono
     cmp byte[SBswitch],0
     je .1stblock
diff --git a/zsnes/src/gui/guikeys.inc b/zsnes/src/gui/guikeys.inc
index 15c74ac8..7f1fcbec 100644
--- a/zsnes/src/gui/guikeys.inc
+++ b/zsnes/src/gui/guikeys.inc
@@ -1264,6 +1264,8 @@ GUISoundKeys:
 .nodynamicfilter
     cmp dh,'H'
     jne .nohiqualityfilter
+    cmp byte[MMXSupport],0
+    je .nohiqualityfilter
     GUIkeystoggleoptn byte[LowPassFilterType],3
 .nohiqualityfilter
     ret
diff --git a/zsnes/src/gui/guimouse.inc b/zsnes/src/gui/guimouse.inc
index e1307d26..d6cf0eb2 100644
--- a/zsnes/src/gui/guimouse.inc
+++ b/zsnes/src/gui/guimouse.inc
@@ -2360,7 +2360,7 @@ DisplayGUISoundClick:
     GUIClickCButton5MMX 11,181,byte[SoundInterpType],3
     GUIClickCButton5 111,161,byte[LowPassFilterType],1
     GUIClickCButton5 111,171,byte[LowPassFilterType],2
-    GUIClickCButton5 111,181,byte[LowPassFilterType],3
+    GUIClickCButton5MMX 111,181,byte[LowPassFilterType],3
     cmp eax,15
     jl near .nosrate
     cmp edx,61