diff --git a/CHANGES b/CHANGES
index d2e2371d0..e58f45177 100644
--- a/CHANGES
+++ b/CHANGES
@@ -4,6 +4,7 @@ Emulation fixes:
  - GB I/O: Fix STAT writing IRQ trigger conditions (fixes mgba.io/i/2501)
  - GBA GPIO: Fix gyro read-out start (fixes mgba.io/i/3141)
  - GBA I/O: Fix HALTCNT access behavior (fixes mgba.io/i/2309)
+ - GBA I/O: Fix audio register 8-bit write behavior (fixes mgba.io/i/3086)
  - GBA SIO: Fix MULTI mode SIOCNT bit 7 writes on secondary GBAs (fixes mgba.io/i/3110)
 Other fixes:
  - GB: Fix uninitialized save data when loading undersized temporary saves
diff --git a/src/gba/io.c b/src/gba/io.c
index 374f87208..07a5cc83c 100644
--- a/src/gba/io.c
+++ b/src/gba/io.c
@@ -378,17 +378,19 @@ void GBAIOWrite(struct GBA* gba, uint32_t address, uint16_t value) {
 		break;
 	case REG_SOUND1CNT_HI:
 		GBAAudioWriteSOUND1CNT_HI(&gba->audio, value);
+		value &= 0xFFC0;
 		break;
 	case REG_SOUND1CNT_X:
 		GBAAudioWriteSOUND1CNT_X(&gba->audio, value);
-		value &= 0x47FF;
+		value &= 0x4000;
 		break;
 	case REG_SOUND2CNT_LO:
 		GBAAudioWriteSOUND2CNT_LO(&gba->audio, value);
+		value &= 0xFFC0;
 		break;
 	case REG_SOUND2CNT_HI:
 		GBAAudioWriteSOUND2CNT_HI(&gba->audio, value);
-		value &= 0x47FF;
+		value &= 0x4000;
 		break;
 	case REG_SOUND3CNT_LO:
 		GBAAudioWriteSOUND3CNT_LO(&gba->audio, value);
@@ -396,16 +398,15 @@ void GBAIOWrite(struct GBA* gba, uint32_t address, uint16_t value) {
 		break;
 	case REG_SOUND3CNT_HI:
 		GBAAudioWriteSOUND3CNT_HI(&gba->audio, value);
-		value &= 0xE03F;
+		value &= 0xE000;
 		break;
 	case REG_SOUND3CNT_X:
 		GBAAudioWriteSOUND3CNT_X(&gba->audio, value);
-		// TODO: The low bits need to not be readable, but still 8-bit writable
-		value &= 0x47FF;
+		value &= 0x4000;
 		break;
 	case REG_SOUND4CNT_LO:
 		GBAAudioWriteSOUND4CNT_LO(&gba->audio, value);
-		value &= 0xFF3F;
+		value &= 0xFF00;
 		break;
 	case REG_SOUND4CNT_HI:
 		GBAAudioWriteSOUND4CNT_HI(&gba->audio, value);
@@ -637,9 +638,96 @@ void GBAIOWrite8(struct GBA* gba, uint32_t address, uint8_t value) {
 	if (address > SIZE_IO) {
 		return;
 	}
-	uint16_t value16 = value << (8 * (address & 1));
-	value16 |= (gba->memory.io[(address & (SIZE_IO - 1)) >> 1]) & ~(0xFF << (8 * (address & 1)));
-	GBAIOWrite(gba, address & 0xFFFFFFFE, value16);
+	uint16_t value16;
+
+	switch (address) {
+	case REG_SOUND1CNT_HI:
+		GBAAudioSample(&gba->audio, mTimingCurrentTime(&gba->timing));
+		GBAudioWriteNR11(&gba->audio.psg, value);
+		gba->memory.io[REG_SOUND1CNT_HI >> 1] &= 0xFF00;
+		gba->memory.io[REG_SOUND1CNT_HI >> 1] |= value & 0xC0;
+		break;
+	case REG_SOUND1CNT_HI + 1:
+		GBAAudioSample(&gba->audio, mTimingCurrentTime(&gba->timing));
+		GBAudioWriteNR12(&gba->audio.psg, value);
+		gba->memory.io[REG_SOUND1CNT_HI >> 1] &= 0x00C0;
+		gba->memory.io[REG_SOUND1CNT_HI >> 1] |= value << 8;
+		break;
+	case REG_SOUND1CNT_X:
+		GBAAudioSample(&gba->audio, mTimingCurrentTime(&gba->timing));
+		GBAudioWriteNR13(&gba->audio.psg, value);
+		break;
+	case REG_SOUND1CNT_X + 1:
+		GBAAudioSample(&gba->audio, mTimingCurrentTime(&gba->timing));
+		GBAudioWriteNR14(&gba->audio.psg, value);
+		gba->memory.io[REG_SOUND1CNT_X >> 1] = (value & 0x40) << 8;
+		break;
+	case REG_SOUND2CNT_LO:
+		GBAAudioSample(&gba->audio, mTimingCurrentTime(&gba->timing));
+		GBAudioWriteNR21(&gba->audio.psg, value);
+		gba->memory.io[REG_SOUND2CNT_LO >> 1] &= 0xFF00;
+		gba->memory.io[REG_SOUND2CNT_LO >> 1] |= value & 0xC0;
+		break;
+	case REG_SOUND2CNT_LO + 1:
+		GBAAudioSample(&gba->audio, mTimingCurrentTime(&gba->timing));
+		GBAudioWriteNR22(&gba->audio.psg, value);
+		gba->memory.io[REG_SOUND2CNT_LO >> 1] &= 0x00C0;
+		gba->memory.io[REG_SOUND2CNT_LO >> 1] |= value << 8;
+		break;
+	case REG_SOUND2CNT_HI:
+		GBAAudioSample(&gba->audio, mTimingCurrentTime(&gba->timing));
+		GBAudioWriteNR23(&gba->audio.psg, value);
+		break;
+	case REG_SOUND2CNT_HI + 1:
+		GBAAudioSample(&gba->audio, mTimingCurrentTime(&gba->timing));
+		GBAudioWriteNR24(&gba->audio.psg, value);
+		gba->memory.io[REG_SOUND2CNT_HI >> 1] = (value & 0x40) << 8;
+		break;
+	case REG_SOUND3CNT_HI:
+		GBAAudioSample(&gba->audio, mTimingCurrentTime(&gba->timing));
+		GBAudioWriteNR31(&gba->audio.psg, value);
+		break;
+	case REG_SOUND3CNT_HI + 1:
+		GBAAudioSample(&gba->audio, mTimingCurrentTime(&gba->timing));
+		gba->audio.psg.ch3.volume = GBAudioRegisterBankVolumeGetVolumeGBA(value);
+		gba->memory.io[REG_SOUND3CNT_HI >> 1] = (value & 0xE0) << 8;
+		break;
+	case REG_SOUND3CNT_X:
+		GBAAudioSample(&gba->audio, mTimingCurrentTime(&gba->timing));
+		GBAudioWriteNR33(&gba->audio.psg, value);
+		break;
+	case REG_SOUND3CNT_X + 1:
+		GBAAudioSample(&gba->audio, mTimingCurrentTime(&gba->timing));
+		GBAudioWriteNR34(&gba->audio.psg, value);
+		gba->memory.io[REG_SOUND3CNT_X >> 1] = (value & 0x40) << 8;
+		break;
+	case REG_SOUND4CNT_LO:
+		GBAAudioSample(&gba->audio, mTimingCurrentTime(&gba->timing));
+		GBAudioWriteNR41(&gba->audio.psg, value);
+		break;
+	case REG_SOUND4CNT_LO + 1:
+		GBAAudioSample(&gba->audio, mTimingCurrentTime(&gba->timing));
+		GBAudioWriteNR42(&gba->audio.psg, value);
+		gba->memory.io[REG_SOUND4CNT_LO >> 1] = value << 8;
+		break;
+	case REG_SOUND4CNT_HI:
+		GBAAudioSample(&gba->audio, mTimingCurrentTime(&gba->timing));
+		GBAudioWriteNR43(&gba->audio.psg, value);
+		gba->memory.io[REG_SOUND4CNT_HI >> 1] &= 0x4000;
+		gba->memory.io[REG_SOUND4CNT_HI >> 1] |= value;
+		break;
+	case REG_SOUND4CNT_HI + 1:
+		GBAAudioSample(&gba->audio, mTimingCurrentTime(&gba->timing));
+		GBAudioWriteNR44(&gba->audio.psg, value);
+		gba->memory.io[REG_SOUND4CNT_HI >> 1] &= 0x00FF;
+		gba->memory.io[REG_SOUND4CNT_HI >> 1] |= (value & 0x40) << 8;
+		break;
+	default:
+		value16 = value << (8 * (address & 1));
+		value16 |= (gba->memory.io[(address & (SIZE_IO - 1)) >> 1]) & ~(0xFF << (8 * (address & 1)));
+		GBAIOWrite(gba, address & 0xFFFFFFFE, value16);
+		break;
+	}
 }
 
 void GBAIOWrite32(struct GBA* gba, uint32_t address, uint32_t value) {