diff --git a/source/gx/config.c b/source/gx/config.c
index 567fd6d..ab32d91 100644
--- a/source/gx/config.c
+++ b/source/gx/config.c
@@ -100,8 +100,8 @@ void config_default(void)
   config.fm_preamp      = 100;
   config.hq_fm          = 1;
   config.psgBoostNoise  = 1;
-  config.filter         = 0;
-  config.lp_range       = 60;
+  config.filter         = 1;
+  config.lp_range       = 0x9999; /* 0.6 in 16.16 fixed point */
   config.low_freq       = 880;
   config.high_freq      = 5000;
   config.lg             = 1.0;
@@ -109,6 +109,7 @@ void config_default(void)
   config.hg             = 1.0;
   config.dac_bits       = 14;
   config.ym2413         = 2; /* AUTO */
+  config.mono           = 0;
 
   /* system options */
   config.system         = 0; /* AUTO */
@@ -131,16 +132,16 @@ void config_default(void)
   config.gg_extra = 0;
   config.ntsc     = 0;
   config.vsync    = 1; /* AUTO */
+  config.bilinear = 1;
+  config.vfilter  = 1;
 
   if (VIDEO_HaveComponentCable())
   {
-    config.render   = 2;
-    config.bilinear = 1;
+    config.render = 2;
   }
   else
   {
-    config.render   = 0;
-    config.bilinear = 0;
+    config.render = 0;
   }
 
   switch (vmode->viTVMode >> 2)
@@ -159,7 +160,7 @@ void config_default(void)
   }
 
 #ifdef HW_RVL
-  config.trap     = 0;
+  config.trap = 0;
   config.gamma = VI_GM_1_0 / 10.0;
 #endif
 
diff --git a/source/gx/config.h b/source/gx/config.h
index d031a25..c2cd096 100644
--- a/source/gx/config.h
+++ b/source/gx/config.h
@@ -40,7 +40,7 @@
 #ifndef _CONFIG_H_
 #define _CONFIG_H_
 
-#define CONFIG_VERSION "GENPLUS-GX 1.7.2"
+#define CONFIG_VERSION "GENPLUS-GX 1.7.4"
 
 /****************************************************************************
  * Config Option 
@@ -54,9 +54,10 @@ typedef struct
   uint8 psgBoostNoise;
   uint8 dac_bits;
   uint8 ym2413;
+  uint8 mono;
   int16 psg_preamp;
   int16 fm_preamp;
-  int16 lp_range;
+  uint32 lp_range;
   int16 low_freq;
   int16 high_freq;
   int16 lg;
@@ -68,7 +69,6 @@ typedef struct
   uint8 vdp_mode;
   uint8 force_dtack;
   uint8 addr_error;
-  uint8 tmss;
   uint8 bios;
   uint8 lock_on;
   uint8 hot_swap;
@@ -81,6 +81,7 @@ typedef struct
   uint8 render;
   uint8 tv_mode;
   uint8 bilinear;
+  uint8 vfilter;
   uint8 aspect;
   int16 xshift;
   int16 yshift;
diff --git a/source/gx/gui/filesel.c b/source/gx/gui/filesel.c
index f95aa5d..1990732 100644
--- a/source/gx/gui/filesel.c
+++ b/source/gx/gui/filesel.c
@@ -484,7 +484,7 @@ int FileSelector(int type)
       if (selection < 0)
       {
         selection = maxfiles - 1;
-        offset = selection - 10 + 1;
+        offset = maxfiles - 10;
       }
       if (selection < offset)
         offset -= 10;
@@ -559,8 +559,12 @@ int FileSelector(int type)
           if ((filelist[i].flags) && !strcmp(prev_folder,filelist[i].filename))
           {
             selection = i;
-            offset = (i / 10) * 10;
-            i = maxfiles;
+            while (i  >= (offset + 10))
+            {
+              offset += 10;
+              if (offset > (maxfiles - 10)) offset = maxfiles - 10;
+            }
+            break;
           }
         }
       }
diff --git a/source/gx/gui/menu.c b/source/gx/gui/menu.c
index 9518611..6bd3718 100644
--- a/source/gx/gui/menu.c
+++ b/source/gx/gui/menu.c
@@ -332,7 +332,7 @@ static gui_item items_options[5] =
 };
 
 /* Audio options */
-static gui_item items_audio[12] =
+static gui_item items_audio[13] =
 {
   {NULL,NULL,"Master System FM: AUTO", "Enable/disable YM2413 chip",              56,132,276,48},
   {NULL,NULL,"High-Quality FM: ON",    "Adjust YM2612/YM2413 resampling quality", 56,132,276,48},
@@ -340,6 +340,7 @@ static gui_item items_audio[12] =
   {NULL,NULL,"FM Volume: 1.00",        "Adjust YM2612/YM2413 output level",       56,132,276,48},
   {NULL,NULL,"PSG Volume: 2.50",       "Adjust SN76489 output level",             56,132,276,48},
   {NULL,NULL,"PSG Noise Boost: OFF",   "Boost SN76489 Noise Channel",             56,132,276,48},
+  {NULL,NULL,"Audio Out: STEREO",      "Select audio mixing output type",         56,132,276,48},
   {NULL,NULL,"Filtering: 3-BAND EQ",   "Setup Audio filtering",                   56,132,276,48},
   {NULL,NULL,"Low Gain: 1.00",         "Adjust EQ Low Band Gain",                 56,132,276,48},
   {NULL,NULL,"Mid Gain: 1.00",         "Adjust EQ Mid Band Gain",                 56,132,276,48},
@@ -365,25 +366,26 @@ static gui_item items_system[10] =
 
 /* Video options */
 #ifdef HW_RVL
-static gui_item items_video[12] =
+static gui_item items_video[13] =
 #else
-static gui_item items_video[10] =
+static gui_item items_video[11] =
 #endif
 {
-  {NULL,NULL,"Display: PROGRESSIVE",    "Select video mode",                          56,132,276,48},
-  {NULL,NULL,"TV mode: 50/60Hz",        "Select video refresh rate",                  56,132,276,48},
-  {NULL,NULL,"VSYNC: AUTO",             "Enable/disable sync with Video Hardware",    56,132,276,48},
-  {NULL,NULL,"GX Bilinear Filter: OFF", "Enable/disable texture hardware filtering",  56,132,276,48},
+  {NULL,NULL,"Display: PROGRESSIVE",     "Select video mode",                          56,132,276,48},
+  {NULL,NULL,"TV mode: 50/60Hz",         "Select video refresh rate",                  56,132,276,48},
+  {NULL,NULL,"VSYNC: AUTO",              "Enable/disable sync with Video Hardware",    56,132,276,48},
+  {NULL,NULL,"GX Bilinear Filter: OFF",  "Enable/disable texture hardware filtering",  56,132,276,48},
+  {NULL,NULL,"GX Deflickering Filter: OFF","Enable/disable GX hardware filtering",     56,132,276,48},
 #ifdef HW_RVL
-  {NULL,NULL,"VI Trap Filter: ON",      "Enable/disable video hardware filtering",    56,132,276,48},
-  {NULL,NULL,"VI Gamma Correction: 1.0","Adjust video hardware gamma correction",     56,132,276,48},
+  {NULL,NULL,"VI Trap Filter: ON",       "Enable/disable video hardware filtering",    56,132,276,48},
+  {NULL,NULL,"VI Gamma Correction: 1.0", "Adjust video hardware gamma correction",     56,132,276,48},
 #endif
-  {NULL,NULL,"NTSC Filter: COMPOSITE",  "Enable/disable NTSC software filtering",     56,132,276,48},
-  {NULL,NULL,"Borders: OFF",            "Enable/disable overscan emulation",          56,132,276,48},
-  {NULL,NULL,"GG screen: ORIGINAL",     "Enable/disable Game Gear extended screen",   56,132,276,48},
-  {NULL,NULL,"Aspect: ORIGINAL (4:3)",  "Select display aspect ratio",                56,132,276,48},
-  {NULL,NULL,"Screen Position (+0,+0)", "Adjust display position",                    56,132,276,48},
-  {NULL,NULL,"Screen Scaling (+0,+0)",  "Adjust display scaling",                     56,132,276,48}
+  {NULL,NULL,"NTSC Filter: COMPOSITE",   "Enable/disable NTSC software filtering",     56,132,276,48},
+  {NULL,NULL,"Borders: OFF",             "Enable/disable overscan emulation",          56,132,276,48},
+  {NULL,NULL,"GG screen: ORIGINAL",      "Enable/disable Game Gear extended screen",   56,132,276,48},
+  {NULL,NULL,"Aspect: ORIGINAL (4:3)",   "Select display aspect ratio",                56,132,276,48},
+  {NULL,NULL,"Screen Position (+0,+0)",  "Adjust display position",                    56,132,276,48},
+  {NULL,NULL,"Screen Scaling (+0,+0)",   "Adjust display scaling",                     56,132,276,48}
 };
 
 /* Menu options */
@@ -819,6 +821,7 @@ static void soundmenu ()
   sprintf (items[3].text, "FM Volume: %1.2f", fm_volume);
   sprintf (items[4].text, "PSG Volume: %1.2f", psg_volume);
   sprintf (items[5].text, "PSG Noise Boost: %s", config.psgBoostNoise ? "ON":"OFF");
+  sprintf (items[6].text, "Audio Out: %s", config.mono ? "MONO":"STEREO");
 
   if (config.filter == 2)
   {
@@ -826,26 +829,27 @@ static void soundmenu ()
     float mg = (float)config.mg/100.0;
     float hg = (float)config.hg/100.0;
 
-    sprintf(items[6].text, "Filtering: 3-BAND EQ");
-    sprintf(items[7].text, "Low Gain: %1.2f", lg);
-    strcpy(items[7].comment, "Adjust EQ Low Band Gain");
-    sprintf(items[8].text, "Middle Gain: %1.2f", mg);
-    sprintf(items[9].text, "High Gain: %1.2f", hg);
-    sprintf(items[10].text, "Low Freq: %d", config.low_freq);
-    sprintf(items[11].text, "High Freq: %d", config.high_freq);
-    m->max_items = 12;
+    sprintf(items[7].text, "Filtering: 3-BAND EQ");
+    sprintf(items[8].text, "Low Gain: %1.2f", lg);
+    strcpy(items[8].comment, "Adjust EQ Low Band Gain");
+    sprintf(items[9].text, "Middle Gain: %1.2f", mg);
+    sprintf(items[10].text, "High Gain: %1.2f", hg);
+    sprintf(items[11].text, "Low Freq: %d", config.low_freq);
+    sprintf(items[12].text, "High Freq: %d", config.high_freq);
+    m->max_items = 13;
   }
   else if (config.filter == 1)
   {
-    sprintf (items[6].text, "Filtering: LOW-PASS");
-    sprintf (items[7].text, "Low-Pass Rate: %d %%", config.lp_range);
-    strcpy (items[7].comment, "Adjust Low Pass filter");
-    m->max_items = 8;
+    int lp_range = (config.lp_range * 100 + 0xffff) / 0x10000;
+    sprintf (items[7].text, "Filtering: LOW-PASS");
+    sprintf (items[8].text, "Low-Pass Rate: %d %%", lp_range);
+    strcpy (items[9].comment, "Adjust Low Pass filter");
+    m->max_items = 9;
   }
   else
   {
-    sprintf (items[6].text, "Filtering: OFF");
-    m->max_items = 7;
+    sprintf (items[7].text, "Filtering: OFF");
+    m->max_items = 8;
   }
 
   GUI_InitMenu(m);
@@ -935,28 +939,36 @@ static void soundmenu ()
       }
 
       case 6:
+      {
+        config.mono ^= 1;
+        sprintf (items[6].text, "Audio Out: %s", config.mono ? "MONO":"STEREO");
+        break;
+      }
+
+      case 7:
       {
         config.filter = (config.filter + 1) % 3;
         if (config.filter == 2)
         {
           float lg = (float)config.lg/100.0;
-          sprintf (items[6].text, "Filtering: 3-BAND EQ");
-          sprintf (items[7].text, "Low Gain: %1.2f", lg);
-          strcpy (items[7].comment, "Adjust EQ Low Band Gain");
-          m->max_items = 12;
+          sprintf (items[7].text, "Filtering: 3-BAND EQ");
+          sprintf (items[8].text, "Low Gain: %1.2f", lg);
+          strcpy (items[8].comment, "Adjust EQ Low Band Gain");
+          m->max_items = 13;
           audio_set_equalizer();
         }
         else if (config.filter == 1)
         {
-          sprintf (items[6].text, "Filtering: LOW-PASS");
-          sprintf (items[7].text, "Low-Pass Rate: %d %%", config.lp_range);
-          strcpy (items[7].comment, "Adjust Low Pass filter");
-          m->max_items = 8;
+          int lp_range = (config.lp_range * 100 + 0xffff) / 0x10000;
+          sprintf (items[7].text, "Filtering: LOW-PASS");
+          sprintf (items[8].text, "Low-Pass Rate: %d %%", lp_range);
+          strcpy (items[8].comment, "Adjust Low Pass filter");
+          m->max_items = 9;
         }
         else
         {
-          sprintf (items[6].text, "Filtering: OFF");
-          m->max_items = 7;
+          sprintf (items[7].text, "Filtering: OFF");
+          m->max_items = 8;
         }
 
         while ((m->offset + 4) > m->max_items)
@@ -967,56 +979,58 @@ static void soundmenu ()
         break;
       }
 
-      case 7:
+      case 8:
       {
         if (config.filter == 1)
         {
-          GUI_OptionBox(m,0,"Low-Pass Rate",(void *)&config.lp_range,1,0,100,1);
-          sprintf (items[7].text, "Low-Pass Rate: %d %%", config.lp_range);
+          int lp_range = (config.lp_range * 100 + 0xffff) / 0x10000;
+          GUI_OptionBox(m,0,"Low-Pass Rate",(void *)&lp_range,1,0,100,1);
+          sprintf (items[8].text, "Low-Pass Rate: %d %%", lp_range);
+          config.lp_range = (lp_range * 0x10000) / 100;
         }
         else
         {
           float lg = (float)config.lg/100.0;
           GUI_OptionBox(m,0,"Low Gain",(void *)&lg,0.01,0.0,2.0,0);
-          sprintf (items[7].text, "Low Gain: %1.2f", lg);
+          sprintf (items[8].text, "Low Gain: %1.2f", lg);
           config.lg = (int)(lg * 100.0);
           audio_set_equalizer();
         }
         break;
       }
 
-      case 8:
+      case 9:
       {
         float mg = (float)config.mg/100.0;
         GUI_OptionBox(m,0,"Middle Gain",(void *)&mg,0.01,0.0,2.0,0);
-        sprintf (items[8].text, "Middle Gain: %1.2f", mg);
+        sprintf (items[9].text, "Middle Gain: %1.2f", mg);
         config.mg = (int)(mg * 100.0);
         audio_set_equalizer();
         break;
       }
 
-      case 9:
-      {
-        float hg = (float)config.hg/100.0;
-        GUI_OptionBox(m,0,"High Gain",(void *)&hg,0.01,0.0,2.0,0);
-        sprintf (items[9].text, "High Gain: %1.2f", hg);
-        config.hg = (int)(hg * 100.0);
-        audio_set_equalizer();
-        break;
-      }
-
       case 10:
       {
-        GUI_OptionBox(m,0,"Low Frequency",(void *)&config.low_freq,10,0,config.high_freq,1);
-        sprintf (items[10].text, "Low Freq: %d", config.low_freq);
+        float hg = (float)config.hg/100.0;
+        GUI_OptionBox(m,0,"High Gain",(void *)&hg,0.01,0.0,2.0,0);
+        sprintf (items[10].text, "High Gain: %1.2f", hg);
+        config.hg = (int)(hg * 100.0);
         audio_set_equalizer();
         break;
       }
 
       case 11:
+      {
+        GUI_OptionBox(m,0,"Low Frequency",(void *)&config.low_freq,10,0,config.high_freq,1);
+        sprintf (items[11].text, "Low Freq: %d", config.low_freq);
+        audio_set_equalizer();
+        break;
+      }
+
+      case 12:
       {
         GUI_OptionBox(m,0,"High Frequency",(void *)&config.high_freq,100,config.low_freq,30000,1);
-        sprintf (items[11].text, "High Freq: %d", config.high_freq);
+        sprintf (items[12].text, "High Freq: %d", config.high_freq);
         audio_set_equalizer();
         break;
       }
@@ -1292,14 +1306,7 @@ static void systemmenu ()
       case 6:  /*** 68k Address Error ***/
       {
         config.addr_error ^= 1;
-        if (((system_hw & SYSTEM_PBC) == SYSTEM_MD) && (system_hw != SYSTEM_MCD))
-        {
-          /* reinitialize cartridge hardware (UMK3 hack support) */
-          md_cart_init();
-
-          /* restore SRAM */
-          slot_autoload(0,config.s_device);
-        }
+        m68k.aerr_enabled = config.addr_error; 
         sprintf (items[6].text, "68k Address Error: %s", config.addr_error ? "ON" : "OFF");
         break;
       }
@@ -1439,14 +1446,14 @@ static void systemmenu ()
  *
  ****************************************************************************/
 #ifdef HW_RVL
-#define VI_OFFSET 6
+#define VI_OFFSET 7
 static void update_gamma(void)
 {
   VIDEO_SetGamma((int)(config.gamma * 10.0));
   VIDEO_Flush();
 }
 #else
-#define VI_OFFSET 4
+#define VI_OFFSET 5
 #endif
 
 static void videomenu ()
@@ -1477,10 +1484,11 @@ static void videomenu ()
     sprintf (items[2].text, "VSYNC: OFF");
 
   sprintf (items[3].text, "GX Bilinear Filter: %s", config.bilinear ? " ON" : "OFF");
+  sprintf (items[4].text, "GX Deflickering Filter: %s", config.vfilter ? " ON" : "OFF");
 
 #ifdef HW_RVL
-  sprintf (items[4].text, "VI Trap Filter: %s", config.trap ? " ON" : "OFF");
-  sprintf (items[5].text, "VI Gamma Correction: %1.1f", config.gamma);
+  sprintf (items[5].text, "VI Trap Filter: %s", config.trap ? " ON" : "OFF");
+  sprintf (items[6].text, "VI Gamma Correction: %1.1f", config.gamma);
 #endif
 
   if (config.ntsc == 1)
@@ -1493,7 +1501,7 @@ static void videomenu ()
     sprintf (items[VI_OFFSET].text, "NTSC Filter: OFF");
 
   if (config.overscan == 3)
-    sprintf (items[VI_OFFSET+1].text, "Borders: ALL");
+    sprintf (items[VI_OFFSET+1].text, "Borders: FULL");
   else if (config.overscan == 2)
     sprintf (items[VI_OFFSET+1].text, "Borders: H ONLY");
   else if (config.overscan == 1)
@@ -1590,13 +1598,18 @@ static void videomenu ()
         sprintf (items[3].text, "GX Bilinear Filter: %s", config.bilinear ? " ON" : "OFF");
         break;
 
-#ifdef HW_RVL
-      case 4: /*** VIDEO Trap filtering ***/
-        config.trap ^= 1;
-        sprintf (items[4].text, "VI Trap Filter: %s", config.trap ? " ON" : "OFF");
+      case 4: /*** GX Copy filtering (deflickering filter) ***/
+        config.vfilter ^= 1;
+        sprintf (items[4].text, "GX Deflicker Filter: %s", config.vfilter ? " ON" : "OFF");
         break;
 
-      case 5: /*** VIDEO Gamma correction ***/
+#ifdef HW_RVL
+      case 5: /*** VIDEO Trap filtering ***/
+        config.trap ^= 1;
+        sprintf (items[5].text, "VI Trap Filter: %s", config.trap ? " ON" : "OFF");
+        break;
+
+      case 6: /*** VIDEO Gamma correction ***/
         if (system_hw) 
         {
           update_gamma();
@@ -1615,7 +1628,7 @@ static void videomenu ()
           m->arrows[1]->state = state[1];
           m->screenshot = 0;
           strcpy(m->title,"Video Settings");
-          sprintf (items[5].text, "VI Gamma Correction: %1.1f", config.gamma);
+          sprintf (items[6].text, "VI Gamma Correction: %1.1f", config.gamma);
           VIDEO_SetGamma(VI_GM_1_0);
           VIDEO_Flush();
         }
@@ -1641,7 +1654,7 @@ static void videomenu ()
       case VI_OFFSET+1: /*** overscan emulation ***/
         config.overscan = (config.overscan + 1) & 3;
         if (config.overscan == 3)
-          sprintf (items[VI_OFFSET+1].text, "Borders: ALL");
+          sprintf (items[VI_OFFSET+1].text, "Borders: FULL");
         else if (config.overscan == 2)
           sprintf (items[VI_OFFSET+1].text, "Borders: H ONLY");
         else if (config.overscan == 1)
diff --git a/source/gx/gx_audio.c b/source/gx/gx_audio.c
index dbd340e..ca24660 100644
--- a/source/gx/gx_audio.c
+++ b/source/gx/gx_audio.c
@@ -78,7 +78,7 @@ static void ai_callback(void)
   prevtime = current;
 #endif
 
-  audio_sync = 1;
+  audio_sync = 0;
 }
 
 /* AUDIO engine initialization */
@@ -128,7 +128,7 @@ void gx_audio_Shutdown(void)
  ***/
 int gx_audio_Update(void)
 {
-  if (audio_sync)
+  if (!audio_sync)
   {
     /* Current available soundbuffer */
     s16 *sb = (s16 *)(soundbuffer[mixbuffer]);
@@ -151,7 +151,7 @@ int gx_audio_Update(void)
     DCFlushRange((void *)sb, size);
     AUDIO_InitDMA((u32) sb, size);
     mixbuffer = (mixbuffer + 1) % SOUND_BUFFER_NUM;
-    audio_sync = 0;
+    audio_sync = 1;
 
     /* Start Audio DMA */
     /* this is called once to kick-off DMA from external memory to audio interface        */
@@ -200,7 +200,7 @@ void gx_audio_Start(void)
   memset(soundbuffer, 0, 3 * SOUND_BUFFER_LEN);
   audioStarted = 0;
   mixbuffer = 0;
-  audio_sync = 1;
+  audio_sync = 0;
 }
 
 /***
diff --git a/source/gx/gx_video.c b/source/gx/gx_video.c
index 21b9860..f0c1756 100644
--- a/source/gx/gx_video.c
+++ b/source/gx/gx_video.c
@@ -368,7 +368,7 @@ static void vi_callback(u32 cnt)
   prevtime = current;
 #endif
 
-  video_sync = 1;
+  video_sync = 0;
 }
 
 /* Vertex Rendering */
@@ -460,7 +460,7 @@ static void gxResetRendering(u8 type)
 }
 
 /* Reset GX rendering mode */
-static void gxResetMode(GXRModeObj *tvmode)
+static void gxResetMode(GXRModeObj *tvmode, int vfilter_enabled)
 {
   Mtx44 p;
   f32 yScale = GX_GetYScaleFactor(tvmode->efbHeight, tvmode->xfbHeight);
@@ -472,7 +472,7 @@ static void gxResetMode(GXRModeObj *tvmode)
   GX_SetScissor(0, 0, tvmode->fbWidth, tvmode->efbHeight);
   GX_SetDispCopySrc(0, 0, tvmode->fbWidth, tvmode->efbHeight);
   GX_SetDispCopyDst(xfbWidth, xfbHeight);
-  GX_SetCopyFilter(tvmode->aa, tvmode->sample_pattern, (tvmode->xfbMode == VI_XFBMODE_SF) ? GX_FALSE : GX_TRUE, tvmode->vfilter);
+  GX_SetCopyFilter(tvmode->aa, tvmode->sample_pattern, (tvmode->xfbMode == VI_XFBMODE_SF) ? GX_FALSE : vfilter_enabled, tvmode->vfilter);
   GX_SetFieldMode(tvmode->field_rendering, ((tvmode->viHeight == 2 * tvmode->xfbHeight) ? GX_ENABLE : GX_DISABLE));
   guOrtho(p, tvmode->efbHeight/2, -(tvmode->efbHeight/2), -(tvmode->fbWidth/2), tvmode->fbWidth/2, 100, 1000);
   GX_LoadProjectionMtx(p, GX_ORTHOGRAPHIC);
@@ -666,6 +666,9 @@ static void gxDrawCrosshair(gx_texture *texture, int x, int y)
   int w = (texture->width * rmode->fbWidth) / (rmode->viWidth);
   int h = (texture->height * rmode->efbHeight) / (rmode->viHeight);
 
+  /* Aspect correction for widescreen TV */
+  if (config.aspect & 2) w = (w * 3) / 4;
+
   /* EFB scale & shift */
   int xwidth = square[3] - square[9];
   int ywidth = square[4] - square[10];
@@ -718,15 +721,18 @@ static void gxDrawCdLeds(gx_texture *texture_l, gx_texture *texture_r)
 {
   /* adjust texture dimensions to XFB->VI scaling */
   int w = (texture_l->width * rmode->fbWidth) / (rmode->viWidth);
-  int h = (texture_r->height * rmode->efbHeight) / (rmode->viHeight);
+  int h = (texture_l->height * rmode->efbHeight) / (rmode->viHeight);
+
+  /* Aspect correction for widescreen TV */
+  if (config.aspect & 2) w = (w * 3) / 4;
 
   /* EFB scale & shift */
   int xwidth = square[3] - square[9];
   int ywidth = square[4] - square[10];
 
   /* adjust texture coordinates to EFB */
-  int xl = (((bitmap.viewport.x + 4) * xwidth) / (bitmap.viewport.w + 2*bitmap.viewport.x)) + square[9];
-  int xr = xwidth - xl + 2*square[9] - w;
+  int xl = ((bitmap.viewport.x * xwidth) / vwidth) + square[9] + 8;
+  int xr = (((bitmap.viewport.x + bitmap.viewport.w) * xwidth) / vwidth) + square[9] - 8 - w;
   int y = (((bitmap.viewport.y + bitmap.viewport.h - 4) * ywidth) / vheight) + square[10] - h;
 
   /* reset GX rendering */
@@ -1466,7 +1472,7 @@ void gx_video_Stop(void)
 
   /* GX menu rendering */
   gxResetRendering(1);
-  gxResetMode(vmode);
+  gxResetMode(vmode, GX_TRUE);
 
   /* render game snapshot */
   gxClearScreen((GXColor)BLACK);
@@ -1625,15 +1631,16 @@ void gx_video_Start(void)
   gxResetRendering(0);
 
   /* resynchronize emulation with VSYNC */
+  video_sync = 0;
   VIDEO_WaitVSync();
 }
 
 /* GX render update */
 int gx_video_Update(void)
 {
-  if (!video_sync && config.vsync && (gc_pal == vdp_pal)) return NO_SYNC;
+  if (video_sync) return NO_SYNC;
 
-  video_sync = 0;
+  video_sync = config.vsync && (gc_pal == vdp_pal);
 
   /* check if display has changed during frame */
   if (bitmap.viewport.changed & 1)
@@ -1684,7 +1691,7 @@ int gx_video_Update(void)
     gxResetScaler(vwidth);
 
     /* update GX rendering mode */
-    gxResetMode(rmode);
+    gxResetMode(rmode, config.vfilter);
 
     /* update VI mode */
     VIDEO_Configure(rmode);
@@ -1829,7 +1836,7 @@ void gx_video_Init(void)
   /* Initialize GX */
   gxStart();
   gxResetRendering(1);
-  gxResetMode(vmode);
+  gxResetMode(vmode, GX_TRUE);
 
   /* initialize FONT */
   FONT_Init();
diff --git a/source/system.c b/source/system.c
index bc7b45d..fac388d 100644
--- a/source/system.c
+++ b/source/system.c
@@ -53,7 +53,7 @@ int16 SVP_cycles = 800;
 
 static uint8 pause_b;
 static EQSTATE eq;
-static int32 llp,rrp;
+static int16 llp,rrp;
 
 /******************************************************************************************/
 /* Audio subsystem                                                                        */
@@ -239,46 +239,47 @@ int audio_update(int16 *buffer)
   /* Audio filtering */
   if (config.filter)
   {
-    int32 i, l, r;
+    int samples = size;
+    int16 *out = buffer;
+    int32 l, r;
 
     if (config.filter & 1)
     {
       /* single-pole low-pass filter (6 dB/octave) */
-      uint32 factora  = (config.lp_range << 16) / 100;
+      uint32 factora  = config.lp_range;
       uint32 factorb  = 0x10000 - factora;
-      int32 ll = llp;
-      int32 rr = rrp;
 
-      for (i = 0; i < size; i ++)
+      /* restore previous sample */
+      l = llp;
+      r = rrp;
+
+      do
       {
         /* apply low-pass filter */
-        ll = (ll>>16)*factora + buffer[0]*factorb;
-        rr = (rr>>16)*factora + buffer[1]*factorb;
-        l = ll >> 16;
-        r = rr >> 16;
+        l = l*factora + out[0]*factorb;
+        r = r*factora + out[1]*factorb;
 
-        /* clipping (16-bit samples) */
-        if (l > 32767) l = 32767;
-        else if (l < -32768) l = -32768;
-        if (r > 32767) r = 32767;
-        else if (r < -32768) r = -32768;
+        /* 16.16 fixed point */
+        l >>= 16;
+        r >>= 16;
 
         /* update sound buffer */
-        *buffer++ = l;
-        *buffer++ = r;
+        *out++ = l;
+        *out++ = r;
       }
+      while (--samples);
 
       /* save last samples for next frame */
-      llp = ll;
-      rrp = rr;
+      llp = l;
+      rrp = r;
     }
     else if (config.filter & 2)
     {
-      for (i = 0; i < size; i ++)
+      do
       {
         /* 3 Band EQ */
-        l = do_3band(&eq,buffer[0]);
-        r = do_3band(&eq,buffer[1]);
+        l = do_3band(&eq,out[0]);
+        r = do_3band(&eq,out[1]);
 
         /* clipping (16-bit samples) */
         if (l > 32767) l = 32767;
@@ -287,12 +288,27 @@ int audio_update(int16 *buffer)
         else if (r < -32768) r = -32768;
 
         /* update sound buffer */
-        *buffer++ = l;
-        *buffer++ = r;
+        *out++ = l;
+        *out++ = r;
       }
+      while (--samples);
     }
   }
 
+  /* Mono output mixing */
+  if (config.mono)
+  {
+    int16 out;
+    int samples = size;
+    do
+    {
+      out = (buffer[0] + buffer[1]) / 2;
+      *buffer++ = out;
+      *buffer++ = out;
+    }
+    while (--samples);
+  }
+
 #ifdef LOGSOUND
   error("%d samples returned\n\n",size);
 #endif
diff --git a/source/win/config.c b/source/win/config.c
index 812dfcf..408cac5 100644
--- a/source/win/config.c
+++ b/source/win/config.c
@@ -13,15 +13,16 @@ void set_config_defaults(void)
   config.fm_preamp      = 100;
   config.hq_fm          = 1;
   config.psgBoostNoise  = 1;
-  config.filter         = 0;
+  config.filter         = 1;
   config.low_freq       = 200;
   config.high_freq      = 8000;
   config.lg             = 1.0;
   config.mg             = 1.0;
   config.hg             = 1.0;
-  config.lp_range       = 60;
+  config.lp_range       = 0x9999; /* 0.6 in 16.16 fixed point */
   config.dac_bits       = 14;
   config.ym2413         = 2; /* = AUTO (0 = always OFF, 1 = always ON) */
+  config.mono           = 0;
 
   /* system options */
   config.system         = 0; /* = AUTO (or SYSTEM_SG, SYSTEM_MARKIII, SYSTEM_SMS, SYSTEM_SMS2, SYSTEM_GG, SYSTEM_MD) */
diff --git a/source/win/config.h b/source/win/config.h
index 22ed43c..457a46d 100644
--- a/source/win/config.h
+++ b/source/win/config.h
@@ -20,19 +20,19 @@ typedef struct
   uint8 ym2413;
   int16 psg_preamp;
   int16 fm_preamp;
-  int16 lp_range;
+  uint32 lp_range;
   int16 low_freq;
   int16 high_freq;
   int16 lg;
   int16 mg;
   int16 hg;
+  uint8 mono;
   uint8 system;
   uint8 region_detect;
   uint8 vdp_mode;
   uint8 master_clock;
   uint8 force_dtack;
   uint8 addr_error;
-  uint8 tmss;
   uint8 bios;
   uint8 lock_on;
   uint8 hot_swap;