diff --git a/src/Sound.cpp b/src/Sound.cpp
index 2a65b03e..f31939d2 100644
--- a/src/Sound.cpp
+++ b/src/Sound.cpp
@@ -74,7 +74,6 @@ u32 soundNextPosition = 0;
 bool soundOffFlag     = false;
 bool soundPaused      = true;
 
-bool soundLowPass = false;
 bool soundReverse = false;
 
 void interp_rate() { /* empty for now */ }
diff --git a/src/Sound.h b/src/Sound.h
index d1584aea..0ad18b5a 100644
--- a/src/Sound.h
+++ b/src/Sound.h
@@ -59,7 +59,6 @@ extern int soundInterpolation;  // 1 if PCM should have low-pass filtering
 extern float soundFiltering;    // 0.0 = none, 1.0 = max (only if soundInterpolation!=0)
 
 // Not used anymore
-extern bool soundLowPass;
 extern bool soundReverse;
 
 // Unknown purpose
diff --git a/src/dmg/gbSound.cpp b/src/dmg/gbSound.cpp
index f3e0b222..50bca315 100644
--- a/src/dmg/gbSound.cpp
+++ b/src/dmg/gbSound.cpp
@@ -43,7 +43,6 @@ extern int soundTicks;
 extern int SOUND_CLOCK_TICKS;
 extern u32 soundNextPosition;
 
-extern bool soundLowPass;
 extern bool soundReverse;
 extern bool soundOffFlag;
 
diff --git a/src/win32/Commands.cpp b/src/win32/Commands.cpp
index e75e47ce..20bf580f 100644
--- a/src/win32/Commands.cpp
+++ b/src/win32/Commands.cpp
@@ -151,7 +151,6 @@ struct {
   { "OptionsSound11Khz", ID_OPTIONS_SOUND_11KHZ },
   { "OptionsSound22Khz", ID_OPTIONS_SOUND_22KHZ },
   { "OptionsSound44Khz", ID_OPTIONS_SOUND_44KHZ },
-  { "OptionsSoundLowPassFilter", ID_OPTIONS_SOUND_LOWPASSFILTER },
   { "OptionsSoundReverseStereo", ID_OPTIONS_SOUND_REVERSESTEREO },
   { "OptionsSoundVolume1x", ID_OPTIONS_SOUND_VOLUME_1X },
   { "OptionsSoundVolume2x", ID_OPTIONS_SOUND_VOLUME_2X },
diff --git a/src/win32/MainWnd.cpp b/src/win32/MainWnd.cpp
index a53a0965..dcd4b050 100644
--- a/src/win32/MainWnd.cpp
+++ b/src/win32/MainWnd.cpp
@@ -206,8 +206,6 @@ BEGIN_MESSAGE_MAP(MainWnd, CWnd)
   ON_UPDATE_COMMAND_UI(ID_OPTIONS_EMULATOR_BMPFORMAT, OnUpdateOptionsEmulatorBmpformat)
   ON_COMMAND(ID_OPTIONS_SOUND_MUTE, OnOptionsSoundMute)
   ON_UPDATE_COMMAND_UI(ID_OPTIONS_SOUND_MUTE, OnUpdateOptionsSoundMute)
-  ON_COMMAND(ID_OPTIONS_SOUND_LOWPASSFILTER, OnOptionsSoundLowpassfilter)
-  ON_UPDATE_COMMAND_UI(ID_OPTIONS_SOUND_LOWPASSFILTER, OnUpdateOptionsSoundLowpassfilter)
   ON_COMMAND(ID_OPTIONS_SOUND_REVERSESTEREO, OnOptionsSoundReversestereo)
   ON_UPDATE_COMMAND_UI(ID_OPTIONS_SOUND_REVERSESTEREO, OnUpdateOptionsSoundReversestereo)
   ON_COMMAND(ID_OPTIONS_SOUND_11KHZ, OnOptionsSound11khz)
diff --git a/src/win32/MainWnd.h b/src/win32/MainWnd.h
index ed353fb5..fc4f75c1 100644
--- a/src/win32/MainWnd.h
+++ b/src/win32/MainWnd.h
@@ -207,8 +207,6 @@ public:
 	afx_msg void OnUpdateOptionsEmulatorBmpformat(CCmdUI* pCmdUI);
 	afx_msg void OnOptionsSoundMute();
 	afx_msg void OnUpdateOptionsSoundMute(CCmdUI* pCmdUI);
-	afx_msg void OnOptionsSoundLowpassfilter();
-	afx_msg void OnUpdateOptionsSoundLowpassfilter(CCmdUI* pCmdUI);
 	afx_msg void OnOptionsSoundReversestereo();
 	afx_msg void OnUpdateOptionsSoundReversestereo(CCmdUI* pCmdUI);
 	afx_msg void OnOptionsSound11khz();
diff --git a/src/win32/MainWndOptions.cpp b/src/win32/MainWndOptions.cpp
index 1d21602b..61c3f5e3 100644
--- a/src/win32/MainWndOptions.cpp
+++ b/src/win32/MainWndOptions.cpp
@@ -832,16 +832,6 @@ void MainWnd::OnAudioEffects()
 	}
 }
 
-void MainWnd::OnOptionsSoundLowpassfilter()
-{
-  soundLowPass = !soundLowPass;
-}
-
-void MainWnd::OnUpdateOptionsSoundLowpassfilter(CCmdUI* pCmdUI)
-{
-  pCmdUI->SetCheck(soundLowPass);
-}
-
 void MainWnd::OnOptionsSoundReversestereo()
 {
   soundReverse = !soundReverse;
diff --git a/src/win32/VBA.cpp b/src/win32/VBA.cpp
index f60988d4..5869fd84 100644
--- a/src/win32/VBA.cpp
+++ b/src/win32/VBA.cpp
@@ -1591,8 +1591,6 @@ void VBA::loadSettings()
 
   soundQuality = regQueryDwordValue("soundQuality", 1);
 
-  soundLowPass = regQueryDwordValue("soundLowPass", 0) ? true : false;
-
   soundReverse = regQueryDwordValue("soundReverse", 0) ? true : false;
 
   soundVolume = regQueryDwordValue("soundVolume", 0);
@@ -2589,8 +2587,6 @@ void VBA::saveSettings()
 
   regSetDwordValue("soundQuality", soundQuality);
 
-  regSetDwordValue("soundLowPass", soundLowPass);
-
   regSetDwordValue("soundReverse", soundReverse);
 
   regSetDwordValue("soundVolume", soundVolume);
diff --git a/src/win32/resource.h b/src/win32/resource.h
index 65d5f506..a8efb20e 100644
--- a/src/win32/resource.h
+++ b/src/win32/resource.h
@@ -684,7 +684,6 @@
 #define ID_TOOLS_CUSTOMIZE              40145
 #define ID_TOOLS_TILEVIEWER             40146
 #define ID_OPTIONS_GAMEBOY_COLORS       40147
-#define ID_OPTIONS_SOUND_LOWPASSFILTER  40149
 #define ID_OPTIONS_SOUND_REVERSESTEREO  40150
 #define ID_TOOLS_DISASSEMBLE            40151
 #define ID_TOOLS_DEBUG_GDB              40152