From d1e2f2be6bba2e853c4b132ee98287731615f0ae Mon Sep 17 00:00:00 2001
From: Jeffrey Pfau <jeffrey@endrift.com>
Date: Sat, 17 Sep 2016 12:36:24 -0700
Subject: [PATCH] GB Audio: Fix channel 4 sampling

---
 src/gb/audio.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/gb/audio.c b/src/gb/audio.c
index 9b78d799f..27070b3eb 100644
--- a/src/gb/audio.c
+++ b/src/gb/audio.c
@@ -553,7 +553,7 @@ int32_t GBAudioProcessEvents(struct GBAudio* audio, int32_t cycles) {
 				if (!audio->ch4.envelope.dead && frame == 7) {
 					--audio->ch4.envelope.nextStep;
 					if (audio->ch4.envelope.nextStep == 0) {
-						int8_t sample = (audio->ch4.sample >> 31) * 0x8;
+						int8_t sample = (audio->ch4.sample >> 7) * 0x8;
 						_updateEnvelope(&audio->ch4.envelope);
 						audio->ch4.sample = sample * audio->ch4.envelope.currentVolume;
 					}