From 56b14c67aafa2bedf86f99d10edda037c415dca0 Mon Sep 17 00:00:00 2001
From: Lior Halphon <LIJI32@gmail.com>
Date: Sat, 22 Jan 2022 01:11:23 +0200
Subject: [PATCH] Fixed AGB audio regression

---
 Cocoa/Document.m |  3 +--
 Core/apu.c       | 13 +++++++++----
 2 files changed, 10 insertions(+), 6 deletions(-)

diff --git a/Cocoa/Document.m b/Cocoa/Document.m
index 92b348d..80da097 100644
--- a/Cocoa/Document.m
+++ b/Cocoa/Document.m
@@ -1128,9 +1128,8 @@ static unsigned *multiplication_table_for_frequency(unsigned frequency)
             [self.consoleWindow orderFront:nil];
         }
         pending_console_output = nil;
-}
+    }
     [console_output_lock unlock];
-
 }
 
 - (void) log: (const char *) string withAttributes: (GB_log_attributes) attributes
diff --git a/Core/apu.c b/Core/apu.c
index 2708113..572969a 100644
--- a/Core/apu.c
+++ b/Core/apu.c
@@ -72,9 +72,7 @@ static void update_sample(GB_gameboy_t *gb, unsigned index, int8_t value, unsign
         /* For some reason, channel 3 is inverted on the AGB */
         value ^= 0xF;
     }
-    
-    if (value == 0 && gb->apu.samples[index] == 0) return;
-    
+        
     if (gb->model >= GB_MODEL_AGB) {
         /* On the AGB, because no analog mixing is done, the behavior of NR51 is a bit different.
            A channel that is not connected to a terminal is idenitcal to a connected channel
@@ -111,6 +109,8 @@ static void update_sample(GB_gameboy_t *gb, unsigned index, int8_t value, unsign
         return;
     }
     
+    if (value == 0 && gb->apu.samples[index] == 0) return;
+    
     if (!GB_apu_is_DAC_enabled(gb, index)) {
         value = gb->apu.samples[index];
     }
@@ -283,7 +283,12 @@ static void render(GB_gameboy_t *gb)
 
 static void update_square_sample(GB_gameboy_t *gb, unsigned index)
 {
-    if (gb->apu.square_channels[index].sample_surpressed) return;
+    if (gb->apu.square_channels[index].sample_surpressed) {
+        if (gb->model >= GB_MODEL_AGB) {
+            update_sample(gb, index, gb->apu.samples[index], 0);
+        }
+        return;
+    }
 
     uint8_t duty = gb->io_registers[index == GB_SQUARE_1? GB_IO_NR11 :GB_IO_NR21] >> 6;
     update_sample(gb, index,