From 7dc575d01e0ecd086f99c647687337a03485a3d9 Mon Sep 17 00:00:00 2001
From: Lior Halphon <LIJI32@gmail.com>
Date: Sat, 16 Apr 2016 14:08:30 +0300
Subject: [PATCH] Fixed a bug where audio channel 3 was playing silently
 instead of being muted.

---
 Core/apu.c | 3 +++
 Core/gb.h  | 1 -
 2 files changed, 3 insertions(+), 1 deletion(-)

diff --git a/Core/apu.c b/Core/apu.c
index 49930b4..d49f0c1 100644
--- a/Core/apu.c
+++ b/Core/apu.c
@@ -361,6 +361,9 @@ void apu_write(GB_gameboy_t *gb, unsigned char reg, unsigned char value)
             break;
         case GB_IO_NR32:
             gb->apu.wave_shift = ((value >> 5) + 3) & 3;
+            if (gb->apu.wave_shift == 3) {
+                gb->apu.wave_shift = 4;
+            }
             break;
         case GB_IO_NR43:
         {
diff --git a/Core/gb.h b/Core/gb.h
index 9140da8..f4214bf 100644
--- a/Core/gb.h
+++ b/Core/gb.h
@@ -57,7 +57,6 @@ enum {
     GB_IO_NR31       = 0x1b, // Channel 3 Sound Length
     GB_IO_NR32       = 0x1c, // Channel 3 Select output level (R/W)
     GB_IO_NR33       = 0x1d, // Channel 3 Frequency's lower data (W)
-
     GB_IO_NR34       = 0x1e, // Channel 3 Frequency's higher data (R/W)
 
     /* Missing */