diff --git a/apu.c b/apu.c
index e0fc6d8..486b804 100644
--- a/apu.c
+++ b/apu.c
@@ -15,15 +15,17 @@
 #include "mem.h"
 #include "cpu.h"
 
-#define P1_ENABLE_LEFT (1<<0)
-#define P2_ENABLE_LEFT (1<<1)
-#define WAV_ENABLE_LEFT (1<<2)
-#define NOISE_ENABLE_LEFT (1<<3)
+//Upper bits of FF25 are Left
+#define P1_ENABLE_LEFT (1<<4)
+#define P2_ENABLE_LEFT (1<<5)
+#define WAV_ENABLE_LEFT (1<<6)
+#define NOISE_ENABLE_LEFT (1<<7)
 
-#define P1_ENABLE_RIGHT (1<<4)
-#define P2_ENABLE_RIGHT (1<<5)
-#define WAV_ENABLE_RIGHT (1<<6)
-#define NOISE_ENABLE_RIGHT (1<<7)
+//Lower bits of FF25 are Right
+#define P1_ENABLE_RIGHT (1<<0)
+#define P2_ENABLE_RIGHT (1<<1)
+#define WAV_ENABLE_RIGHT (1<<2)
+#define NOISE_ENABLE_RIGHT (1<<3)
 
 static uint8_t APU_IO_Reg[0x50];
 
diff --git a/main.c b/main.c
index d3bcd98..e2e60cf 100644
--- a/main.c
+++ b/main.c
@@ -26,7 +26,7 @@
 #define DEBUG_KEY 0
 #define DEBUG_LOAD_INFO 1
 
-static const char *VERSION_STRING = "fixGB Alpha v0.5";
+static const char *VERSION_STRING = "fixGB Alpha v0.5.1";
 
 static void gbEmuDisplayFrame(void);
 static void gbEmuMainLoop(void);