diff --git a/src/burn/drv/megadrive/megadrive.cpp b/src/burn/drv/megadrive/megadrive.cpp
index 9921f946f..0a292c46f 100644
--- a/src/burn/drv/megadrive/megadrive.cpp
+++ b/src/burn/drv/megadrive/megadrive.cpp
@@ -1134,14 +1134,14 @@ static INT32 MegadriveResetDo()
 		BurnYM2612Exit();
 		BurnYM2612Init(1, OSC_PAL / 7, NULL, MegadriveSynchroniseStreamPAL, MegadriveGetTimePAL, 0);
 		BurnTimerAttachSek(OSC_PAL / 7);
-		BurnYM2612SetRoute(0, BURN_SND_YM2612_YM2612_ROUTE_1, 0.50, BURN_SND_ROUTE_LEFT);
-		BurnYM2612SetRoute(0, BURN_SND_YM2612_YM2612_ROUTE_2, 0.50, BURN_SND_ROUTE_RIGHT);
+		BurnYM2612SetRoute(0, BURN_SND_YM2612_YM2612_ROUTE_1, 0.75, BURN_SND_ROUTE_LEFT);
+		BurnYM2612SetRoute(0, BURN_SND_YM2612_YM2612_ROUTE_2, 0.75, BURN_SND_ROUTE_RIGHT);
 		
 		BurnYM2612Reset();
 		
 		SN76496Exit();
 		SN76496Init(0, OSC_PAL / 15, 1);
-		SN76496SetRoute(0, 0.25, BURN_SND_ROUTE_BOTH);
+		SN76496SetRoute(0, 0.50, BURN_SND_ROUTE_BOTH);
 	} else {
 		BurnSetRefreshRate(60.0);
 		Reinitialise();
@@ -1149,14 +1149,14 @@ static INT32 MegadriveResetDo()
 		BurnYM2612Exit();
 		BurnYM2612Init(1, OSC_NTSC / 7, NULL, MegadriveSynchroniseStream, MegadriveGetTime, 0);
 		BurnTimerAttachSek(OSC_NTSC / 7);
-		BurnYM2612SetRoute(0, BURN_SND_YM2612_YM2612_ROUTE_1, 0.50, BURN_SND_ROUTE_LEFT);
-		BurnYM2612SetRoute(0, BURN_SND_YM2612_YM2612_ROUTE_2, 0.50, BURN_SND_ROUTE_RIGHT);
+		BurnYM2612SetRoute(0, BURN_SND_YM2612_YM2612_ROUTE_1, 0.75, BURN_SND_ROUTE_LEFT);
+		BurnYM2612SetRoute(0, BURN_SND_YM2612_YM2612_ROUTE_2, 0.75, BURN_SND_ROUTE_RIGHT);
 		
 		BurnYM2612Reset();
 		
 		SN76496Exit();
 		SN76496Init(0, OSC_NTSC / 15, 1);
-		SN76496SetRoute(0, 0.25, BURN_SND_ROUTE_BOTH);
+		SN76496SetRoute(0, 0.50, BURN_SND_ROUTE_BOTH);
 	}
 
 	// other reset
@@ -1191,12 +1191,13 @@ INT32 __fastcall MegadriveIrqCallback(INT32 irq)
 UINT8 __fastcall MegadriveZ80PortRead(UINT16 a)
 {
 	a &= 0xff;
-	
+
 	switch (a) {
+		case 0xbf: break; // some games read this, case added just to prevent massive debug scroll
 		default: {
 			bprintf(PRINT_NORMAL, _T("Z80 Port Read %02x\n"), a);
 		}
-	}	
+	}
 
 	return 0;
 }
@@ -2977,11 +2978,11 @@ INT32 MegadriveInit()
 	DrvSECAM = 0;
 	BurnYM2612Init(1, OSC_NTSC / 7, NULL, MegadriveSynchroniseStream, MegadriveGetTime, 0);
 	BurnTimerAttachSek(OSC_NTSC / 7);
-	BurnYM2612SetRoute(0, BURN_SND_YM2612_YM2612_ROUTE_1, 0.50, BURN_SND_ROUTE_LEFT);
-	BurnYM2612SetRoute(0, BURN_SND_YM2612_YM2612_ROUTE_2, 0.50, BURN_SND_ROUTE_RIGHT);
+	BurnYM2612SetRoute(0, BURN_SND_YM2612_YM2612_ROUTE_1, 0.75, BURN_SND_ROUTE_LEFT);
+	BurnYM2612SetRoute(0, BURN_SND_YM2612_YM2612_ROUTE_2, 0.75, BURN_SND_ROUTE_RIGHT);
 	
 	SN76496Init(0, OSC_NTSC / 15, 1);
-	SN76496SetRoute(0, 0.25, BURN_SND_ROUTE_BOTH);
+	SN76496SetRoute(0, 0.50, BURN_SND_ROUTE_BOTH);
 	
 	MegadriveSetupSRAM();
 	SetupCustomCartridgeMappers();