diff --git a/src/world/World.php b/src/world/World.php
index cc42b6593..ed1e3da1e 100644
--- a/src/world/World.php
+++ b/src/world/World.php
@@ -477,9 +477,6 @@ class World implements ChunkManager{
 	 */
 	public function addSound(Vector3 $pos, Sound $sound, ?array $players = null) : void{
 		$pk = $sound->encode($pos);
-		if(!is_array($pk)){
-			$pk = [$pk];
-		}
 		if(count($pk) > 0){
 			if($players === null){
 				foreach($pk as $e){
diff --git a/src/world/sound/AnvilBreakSound.php b/src/world/sound/AnvilBreakSound.php
index 0e12bdc35..9da378b35 100644
--- a/src/world/sound/AnvilBreakSound.php
+++ b/src/world/sound/AnvilBreakSound.php
@@ -28,7 +28,7 @@ use pocketmine\network\mcpe\protocol\LevelEventPacket;
 
 class AnvilBreakSound implements Sound{
 
-	public function encode(?Vector3 $pos){
-		return LevelEventPacket::create(LevelEventPacket::EVENT_SOUND_ANVIL_BREAK, 0, $pos);
+	public function encode(?Vector3 $pos) : array{
+		return [LevelEventPacket::create(LevelEventPacket::EVENT_SOUND_ANVIL_BREAK, 0, $pos)];
 	}
 }
diff --git a/src/world/sound/AnvilFallSound.php b/src/world/sound/AnvilFallSound.php
index 338b5e0f9..7abf3f6ce 100644
--- a/src/world/sound/AnvilFallSound.php
+++ b/src/world/sound/AnvilFallSound.php
@@ -28,7 +28,7 @@ use pocketmine\network\mcpe\protocol\LevelEventPacket;
 
 class AnvilFallSound implements Sound{
 
-	public function encode(?Vector3 $pos){
-		return LevelEventPacket::create(LevelEventPacket::EVENT_SOUND_ANVIL_FALL, 0, $pos);
+	public function encode(?Vector3 $pos) : array{
+		return [LevelEventPacket::create(LevelEventPacket::EVENT_SOUND_ANVIL_FALL, 0, $pos)];
 	}
 }
diff --git a/src/world/sound/AnvilUseSound.php b/src/world/sound/AnvilUseSound.php
index cb9c9841d..93c0b64ee 100644
--- a/src/world/sound/AnvilUseSound.php
+++ b/src/world/sound/AnvilUseSound.php
@@ -28,7 +28,7 @@ use pocketmine\network\mcpe\protocol\LevelEventPacket;
 
 class AnvilUseSound implements Sound{
 
-	public function encode(?Vector3 $pos){
-		return LevelEventPacket::create(LevelEventPacket::EVENT_SOUND_ANVIL_USE, 0, $pos);
+	public function encode(?Vector3 $pos) : array{
+		return [LevelEventPacket::create(LevelEventPacket::EVENT_SOUND_ANVIL_USE, 0, $pos)];
 	}
 }
diff --git a/src/world/sound/ArrowHitSound.php b/src/world/sound/ArrowHitSound.php
index 84899ab59..1927b0c2c 100644
--- a/src/world/sound/ArrowHitSound.php
+++ b/src/world/sound/ArrowHitSound.php
@@ -28,7 +28,7 @@ use pocketmine\network\mcpe\protocol\LevelSoundEventPacket;
 
 class ArrowHitSound implements Sound{
 
-	public function encode(?Vector3 $pos){
-		return LevelSoundEventPacket::create(LevelSoundEventPacket::SOUND_BOW_HIT, $pos);
+	public function encode(?Vector3 $pos) : array{
+		return [LevelSoundEventPacket::create(LevelSoundEventPacket::SOUND_BOW_HIT, $pos)];
 	}
 }
diff --git a/src/world/sound/BlazeShootSound.php b/src/world/sound/BlazeShootSound.php
index ed9335e3b..3924784d0 100644
--- a/src/world/sound/BlazeShootSound.php
+++ b/src/world/sound/BlazeShootSound.php
@@ -28,7 +28,7 @@ use pocketmine\network\mcpe\protocol\LevelEventPacket;
 
 class BlazeShootSound implements Sound{
 
-	public function encode(?Vector3 $pos){
-		return LevelEventPacket::create(LevelEventPacket::EVENT_SOUND_BLAZE_SHOOT, 0, $pos);
+	public function encode(?Vector3 $pos) : array{
+		return [LevelEventPacket::create(LevelEventPacket::EVENT_SOUND_BLAZE_SHOOT, 0, $pos)];
 	}
 }
diff --git a/src/world/sound/BlockBreakSound.php b/src/world/sound/BlockBreakSound.php
index 81809e126..b5c9a11b9 100644
--- a/src/world/sound/BlockBreakSound.php
+++ b/src/world/sound/BlockBreakSound.php
@@ -37,7 +37,7 @@ class BlockBreakSound implements Sound{
 		$this->block = $block;
 	}
 
-	public function encode(?Vector3 $pos){
-		return LevelSoundEventPacket::create(LevelSoundEventPacket::SOUND_BREAK, $pos, RuntimeBlockMapping::getInstance()->toRuntimeId($this->block->getFullId()));
+	public function encode(?Vector3 $pos) : array{
+		return [LevelSoundEventPacket::create(LevelSoundEventPacket::SOUND_BREAK, $pos, RuntimeBlockMapping::getInstance()->toRuntimeId($this->block->getFullId()))];
 	}
 }
diff --git a/src/world/sound/BlockPlaceSound.php b/src/world/sound/BlockPlaceSound.php
index 9441e5bc9..8635588b4 100644
--- a/src/world/sound/BlockPlaceSound.php
+++ b/src/world/sound/BlockPlaceSound.php
@@ -37,7 +37,7 @@ class BlockPlaceSound implements Sound{
 		$this->block = $block;
 	}
 
-	public function encode(?Vector3 $pos){
-		return LevelSoundEventPacket::create(LevelSoundEventPacket::SOUND_PLACE, $pos, RuntimeBlockMapping::getInstance()->toRuntimeId($this->block->getFullId()));
+	public function encode(?Vector3 $pos) : array{
+		return [LevelSoundEventPacket::create(LevelSoundEventPacket::SOUND_PLACE, $pos, RuntimeBlockMapping::getInstance()->toRuntimeId($this->block->getFullId()))];
 	}
 }
diff --git a/src/world/sound/BlockPunchSound.php b/src/world/sound/BlockPunchSound.php
index 33a15cce5..0637c4133 100644
--- a/src/world/sound/BlockPunchSound.php
+++ b/src/world/sound/BlockPunchSound.php
@@ -40,11 +40,11 @@ class BlockPunchSound implements Sound{
 		$this->block = $block;
 	}
 
-	public function encode(?Vector3 $pos){
-		return LevelSoundEventPacket::create(
+	public function encode(?Vector3 $pos) : array{
+		return [LevelSoundEventPacket::create(
 			LevelSoundEventPacket::SOUND_HIT,
 			$pos,
 			RuntimeBlockMapping::getInstance()->toRuntimeId($this->block->getFullId())
-		);
+		)];
 	}
 }
diff --git a/src/world/sound/BowShootSound.php b/src/world/sound/BowShootSound.php
index ddbc310e9..09f644bfb 100644
--- a/src/world/sound/BowShootSound.php
+++ b/src/world/sound/BowShootSound.php
@@ -28,7 +28,7 @@ use pocketmine\network\mcpe\protocol\LevelSoundEventPacket;
 
 class BowShootSound implements Sound{
 
-	public function encode(?Vector3 $pos){
-		return LevelSoundEventPacket::create(LevelSoundEventPacket::SOUND_BOW, $pos);
+	public function encode(?Vector3 $pos) : array{
+		return [LevelSoundEventPacket::create(LevelSoundEventPacket::SOUND_BOW, $pos)];
 	}
 }
diff --git a/src/world/sound/BucketEmptyLavaSound.php b/src/world/sound/BucketEmptyLavaSound.php
index da9f4a703..2764cc823 100644
--- a/src/world/sound/BucketEmptyLavaSound.php
+++ b/src/world/sound/BucketEmptyLavaSound.php
@@ -28,7 +28,7 @@ use pocketmine\network\mcpe\protocol\LevelSoundEventPacket;
 
 class BucketEmptyLavaSound implements Sound{
 
-	public function encode(?Vector3 $pos){
-		return LevelSoundEventPacket::create(LevelSoundEventPacket::SOUND_BUCKET_EMPTY_LAVA, $pos);
+	public function encode(?Vector3 $pos) : array{
+		return [LevelSoundEventPacket::create(LevelSoundEventPacket::SOUND_BUCKET_EMPTY_LAVA, $pos)];
 	}
 }
diff --git a/src/world/sound/BucketEmptyWaterSound.php b/src/world/sound/BucketEmptyWaterSound.php
index 6c50d9ef7..b3b847721 100644
--- a/src/world/sound/BucketEmptyWaterSound.php
+++ b/src/world/sound/BucketEmptyWaterSound.php
@@ -28,7 +28,7 @@ use pocketmine\network\mcpe\protocol\LevelSoundEventPacket;
 
 class BucketEmptyWaterSound implements Sound{
 
-	public function encode(?Vector3 $pos){
-		return LevelSoundEventPacket::create(LevelSoundEventPacket::SOUND_BUCKET_EMPTY_WATER, $pos);
+	public function encode(?Vector3 $pos) : array{
+		return [LevelSoundEventPacket::create(LevelSoundEventPacket::SOUND_BUCKET_EMPTY_WATER, $pos)];
 	}
 }
diff --git a/src/world/sound/BucketFillLavaSound.php b/src/world/sound/BucketFillLavaSound.php
index a20601ef7..c8dbba300 100644
--- a/src/world/sound/BucketFillLavaSound.php
+++ b/src/world/sound/BucketFillLavaSound.php
@@ -28,7 +28,7 @@ use pocketmine\network\mcpe\protocol\LevelSoundEventPacket;
 
 class BucketFillLavaSound implements Sound{
 
-	public function encode(?Vector3 $pos){
-		return LevelSoundEventPacket::create(LevelSoundEventPacket::SOUND_BUCKET_FILL_LAVA, $pos);
+	public function encode(?Vector3 $pos) : array{
+		return [LevelSoundEventPacket::create(LevelSoundEventPacket::SOUND_BUCKET_FILL_LAVA, $pos)];
 	}
 }
diff --git a/src/world/sound/BucketFillWaterSound.php b/src/world/sound/BucketFillWaterSound.php
index 29e05e697..0661a5da0 100644
--- a/src/world/sound/BucketFillWaterSound.php
+++ b/src/world/sound/BucketFillWaterSound.php
@@ -28,7 +28,7 @@ use pocketmine\network\mcpe\protocol\LevelSoundEventPacket;
 
 class BucketFillWaterSound implements Sound{
 
-	public function encode(?Vector3 $pos){
-		return LevelSoundEventPacket::create(LevelSoundEventPacket::SOUND_BUCKET_FILL_WATER, $pos);
+	public function encode(?Vector3 $pos) : array{
+		return [LevelSoundEventPacket::create(LevelSoundEventPacket::SOUND_BUCKET_FILL_WATER, $pos)];
 	}
 }
diff --git a/src/world/sound/ChestCloseSound.php b/src/world/sound/ChestCloseSound.php
index e3476e47d..744305b1b 100644
--- a/src/world/sound/ChestCloseSound.php
+++ b/src/world/sound/ChestCloseSound.php
@@ -28,7 +28,7 @@ use pocketmine\network\mcpe\protocol\LevelSoundEventPacket;
 
 class ChestCloseSound implements Sound{
 
-	public function encode(?Vector3 $pos){
-		return LevelSoundEventPacket::create(LevelSoundEventPacket::SOUND_CHEST_CLOSED, $pos);
+	public function encode(?Vector3 $pos) : array{
+		return [LevelSoundEventPacket::create(LevelSoundEventPacket::SOUND_CHEST_CLOSED, $pos)];
 	}
 }
diff --git a/src/world/sound/ChestOpenSound.php b/src/world/sound/ChestOpenSound.php
index 2668b8e8d..86a7ea8fc 100644
--- a/src/world/sound/ChestOpenSound.php
+++ b/src/world/sound/ChestOpenSound.php
@@ -28,7 +28,7 @@ use pocketmine\network\mcpe\protocol\LevelSoundEventPacket;
 
 class ChestOpenSound implements Sound{
 
-	public function encode(?Vector3 $pos){
-		return LevelSoundEventPacket::create(LevelSoundEventPacket::SOUND_CHEST_OPEN, $pos);
+	public function encode(?Vector3 $pos) : array{
+		return [LevelSoundEventPacket::create(LevelSoundEventPacket::SOUND_CHEST_OPEN, $pos)];
 	}
 }
diff --git a/src/world/sound/ClickSound.php b/src/world/sound/ClickSound.php
index 67d904784..dad9e325a 100644
--- a/src/world/sound/ClickSound.php
+++ b/src/world/sound/ClickSound.php
@@ -39,7 +39,7 @@ class ClickSound implements Sound{
 		return $this->pitch;
 	}
 
-	public function encode(?Vector3 $pos){
-		return LevelEventPacket::create(LevelEventPacket::EVENT_SOUND_CLICK, (int) ($this->pitch * 1000), $pos);
+	public function encode(?Vector3 $pos) : array{
+		return [LevelEventPacket::create(LevelEventPacket::EVENT_SOUND_CLICK, (int) ($this->pitch * 1000), $pos)];
 	}
 }
diff --git a/src/world/sound/DoorBumpSound.php b/src/world/sound/DoorBumpSound.php
index 3d03176f2..2d13b0ad8 100644
--- a/src/world/sound/DoorBumpSound.php
+++ b/src/world/sound/DoorBumpSound.php
@@ -28,7 +28,7 @@ use pocketmine\network\mcpe\protocol\LevelEventPacket;
 
 class DoorBumpSound implements Sound{
 
-	public function encode(?Vector3 $pos){
-		return LevelEventPacket::create(LevelEventPacket::EVENT_SOUND_DOOR_BUMP, 0, $pos);
+	public function encode(?Vector3 $pos) : array{
+		return [LevelEventPacket::create(LevelEventPacket::EVENT_SOUND_DOOR_BUMP, 0, $pos)];
 	}
 }
diff --git a/src/world/sound/DoorCrashSound.php b/src/world/sound/DoorCrashSound.php
index 833d4e9e3..fa9524a74 100644
--- a/src/world/sound/DoorCrashSound.php
+++ b/src/world/sound/DoorCrashSound.php
@@ -28,7 +28,7 @@ use pocketmine\network\mcpe\protocol\LevelEventPacket;
 
 class DoorCrashSound implements Sound{
 
-	public function encode(?Vector3 $pos){
-		return LevelEventPacket::create(LevelEventPacket::EVENT_SOUND_DOOR_CRASH, 0, $pos);
+	public function encode(?Vector3 $pos) : array{
+		return [LevelEventPacket::create(LevelEventPacket::EVENT_SOUND_DOOR_CRASH, 0, $pos)];
 	}
 }
diff --git a/src/world/sound/DoorSound.php b/src/world/sound/DoorSound.php
index 57f2ba6f9..9eca4181d 100644
--- a/src/world/sound/DoorSound.php
+++ b/src/world/sound/DoorSound.php
@@ -39,7 +39,7 @@ class DoorSound implements Sound{
 		return $this->pitch;
 	}
 
-	public function encode(?Vector3 $pos){
-		return LevelEventPacket::create(LevelEventPacket::EVENT_SOUND_DOOR, (int) ($this->pitch * 1000), $pos);
+	public function encode(?Vector3 $pos) : array{
+		return [LevelEventPacket::create(LevelEventPacket::EVENT_SOUND_DOOR, (int) ($this->pitch * 1000), $pos)];
 	}
 }
diff --git a/src/world/sound/EnderChestCloseSound.php b/src/world/sound/EnderChestCloseSound.php
index 021d6c357..07073b523 100644
--- a/src/world/sound/EnderChestCloseSound.php
+++ b/src/world/sound/EnderChestCloseSound.php
@@ -28,7 +28,7 @@ use pocketmine\network\mcpe\protocol\LevelSoundEventPacket;
 
 class EnderChestCloseSound implements Sound{
 
-	public function encode(?Vector3 $pos){
-		return LevelSoundEventPacket::create(LevelSoundEventPacket::SOUND_ENDERCHEST_CLOSED, $pos);
+	public function encode(?Vector3 $pos) : array{
+		return [LevelSoundEventPacket::create(LevelSoundEventPacket::SOUND_ENDERCHEST_CLOSED, $pos)];
 	}
 }
diff --git a/src/world/sound/EnderChestOpenSound.php b/src/world/sound/EnderChestOpenSound.php
index 13788a6e8..17e6fef9b 100644
--- a/src/world/sound/EnderChestOpenSound.php
+++ b/src/world/sound/EnderChestOpenSound.php
@@ -28,7 +28,7 @@ use pocketmine\network\mcpe\protocol\LevelSoundEventPacket;
 
 class EnderChestOpenSound implements Sound{
 
-	public function encode(?Vector3 $pos){
-		return LevelSoundEventPacket::create(LevelSoundEventPacket::SOUND_ENDERCHEST_OPEN, $pos);
+	public function encode(?Vector3 $pos) : array{
+		return [LevelSoundEventPacket::create(LevelSoundEventPacket::SOUND_ENDERCHEST_OPEN, $pos)];
 	}
 }
diff --git a/src/world/sound/EndermanTeleportSound.php b/src/world/sound/EndermanTeleportSound.php
index 5f6b2372d..544ffcd21 100644
--- a/src/world/sound/EndermanTeleportSound.php
+++ b/src/world/sound/EndermanTeleportSound.php
@@ -28,7 +28,7 @@ use pocketmine\network\mcpe\protocol\LevelEventPacket;
 
 class EndermanTeleportSound implements Sound{
 
-	public function encode(?Vector3 $pos){
-		return LevelEventPacket::create(LevelEventPacket::EVENT_SOUND_ENDERMAN_TELEPORT, 0, $pos);
+	public function encode(?Vector3 $pos) : array{
+		return [LevelEventPacket::create(LevelEventPacket::EVENT_SOUND_ENDERMAN_TELEPORT, 0, $pos)];
 	}
 }
diff --git a/src/world/sound/EntityAttackNoDamageSound.php b/src/world/sound/EntityAttackNoDamageSound.php
index 5684adf6b..edd39483c 100644
--- a/src/world/sound/EntityAttackNoDamageSound.php
+++ b/src/world/sound/EntityAttackNoDamageSound.php
@@ -31,12 +31,12 @@ use pocketmine\network\mcpe\protocol\LevelSoundEventPacket;
  */
 class EntityAttackNoDamageSound implements Sound{
 
-	public function encode(?Vector3 $pos){
-		return LevelSoundEventPacket::create(
+	public function encode(?Vector3 $pos) : array{
+		return [LevelSoundEventPacket::create(
 			LevelSoundEventPacket::SOUND_ATTACK_NODAMAGE,
 			$pos,
 			-1,
 			"minecraft:player"
-		);
+		)];
 	}
 }
diff --git a/src/world/sound/EntityAttackSound.php b/src/world/sound/EntityAttackSound.php
index 102e458d6..04b461f49 100644
--- a/src/world/sound/EntityAttackSound.php
+++ b/src/world/sound/EntityAttackSound.php
@@ -31,12 +31,12 @@ use pocketmine\network\mcpe\protocol\LevelSoundEventPacket;
  */
 class EntityAttackSound implements Sound{
 
-	public function encode(?Vector3 $pos){
-		return LevelSoundEventPacket::create(
+	public function encode(?Vector3 $pos) : array{
+		return [LevelSoundEventPacket::create(
 			LevelSoundEventPacket::SOUND_ATTACK_STRONG, //TODO: seems like ATTACK is dysfunctional
 			$pos,
 			-1,
 			"minecraft:player"
-		);
+		)];
 	}
 }
diff --git a/src/world/sound/EntityLandSound.php b/src/world/sound/EntityLandSound.php
index 47e9736ab..983c0d2e6 100644
--- a/src/world/sound/EntityLandSound.php
+++ b/src/world/sound/EntityLandSound.php
@@ -44,13 +44,13 @@ class EntityLandSound implements Sound{
 		$this->blockLandedOn = $blockLandedOn;
 	}
 
-	public function encode(?Vector3 $pos){
-		return LevelSoundEventPacket::create(
+	public function encode(?Vector3 $pos) : array{
+		return [LevelSoundEventPacket::create(
 			LevelSoundEventPacket::SOUND_LAND,
 			$pos,
 			RuntimeBlockMapping::getInstance()->toRuntimeId($this->blockLandedOn->getFullId()),
 			$this->entity::getNetworkTypeId()
 			//TODO: does isBaby have any relevance here?
-		);
+		)];
 	}
 }
diff --git a/src/world/sound/EntityLongFallSound.php b/src/world/sound/EntityLongFallSound.php
index 93378e218..2e95b9e8c 100644
--- a/src/world/sound/EntityLongFallSound.php
+++ b/src/world/sound/EntityLongFallSound.php
@@ -40,13 +40,13 @@ class EntityLongFallSound implements Sound{
 		$this->entity = $entity;
 	}
 
-	public function encode(?Vector3 $pos){
-		return LevelSoundEventPacket::create(
+	public function encode(?Vector3 $pos) : array{
+		return [LevelSoundEventPacket::create(
 			LevelSoundEventPacket::SOUND_FALL_BIG,
 			$pos,
 			-1,
 			$this->entity::getNetworkTypeId()
 			//TODO: is isBaby relevant here?
-		);
+		)];
 	}
 }
diff --git a/src/world/sound/EntityShortFallSound.php b/src/world/sound/EntityShortFallSound.php
index d1f096ce2..de16c58b0 100644
--- a/src/world/sound/EntityShortFallSound.php
+++ b/src/world/sound/EntityShortFallSound.php
@@ -39,13 +39,13 @@ class EntityShortFallSound implements Sound{
 		$this->entity = $entity;
 	}
 
-	public function encode(?Vector3 $pos){
-		return LevelSoundEventPacket::create(
+	public function encode(?Vector3 $pos) : array{
+		return [LevelSoundEventPacket::create(
 			LevelSoundEventPacket::SOUND_FALL_SMALL,
 			$pos,
 			-1,
 			$this->entity::getNetworkTypeId()
 			//TODO: does isBaby have any relevance here?
-		);
+		)];
 	}
 }
diff --git a/src/world/sound/ExplodeSound.php b/src/world/sound/ExplodeSound.php
index 7e9ee4715..86ed9b342 100644
--- a/src/world/sound/ExplodeSound.php
+++ b/src/world/sound/ExplodeSound.php
@@ -28,7 +28,7 @@ use pocketmine\network\mcpe\protocol\LevelSoundEventPacket;
 
 class ExplodeSound implements Sound{
 
-	public function encode(?Vector3 $pos){
-		return LevelSoundEventPacket::create(LevelSoundEventPacket::SOUND_EXPLODE, $pos);
+	public function encode(?Vector3 $pos) : array{
+		return [LevelSoundEventPacket::create(LevelSoundEventPacket::SOUND_EXPLODE, $pos)];
 	}
 }
diff --git a/src/world/sound/FizzSound.php b/src/world/sound/FizzSound.php
index 1f10bd22a..0e7b42ffb 100644
--- a/src/world/sound/FizzSound.php
+++ b/src/world/sound/FizzSound.php
@@ -39,7 +39,7 @@ class FizzSound implements Sound{
 		return $this->pitch;
 	}
 
-	public function encode(?Vector3 $pos){
-		return LevelEventPacket::create(LevelEventPacket::EVENT_SOUND_FIZZ, (int) ($this->pitch * 1000), $pos);
+	public function encode(?Vector3 $pos) : array{
+		return [LevelEventPacket::create(LevelEventPacket::EVENT_SOUND_FIZZ, (int) ($this->pitch * 1000), $pos)];
 	}
 }
diff --git a/src/world/sound/FlintSteelSound.php b/src/world/sound/FlintSteelSound.php
index eb4fe3e93..185216959 100644
--- a/src/world/sound/FlintSteelSound.php
+++ b/src/world/sound/FlintSteelSound.php
@@ -28,7 +28,7 @@ use pocketmine\network\mcpe\protocol\LevelSoundEventPacket;
 
 class FlintSteelSound implements Sound{
 
-	public function encode(?Vector3 $pos){
-		return LevelSoundEventPacket::create(LevelSoundEventPacket::SOUND_IGNITE, $pos);
+	public function encode(?Vector3 $pos) : array{
+		return [LevelSoundEventPacket::create(LevelSoundEventPacket::SOUND_IGNITE, $pos)];
 	}
 }
diff --git a/src/world/sound/GhastShootSound.php b/src/world/sound/GhastShootSound.php
index 0029553ef..40f6a47cc 100644
--- a/src/world/sound/GhastShootSound.php
+++ b/src/world/sound/GhastShootSound.php
@@ -28,7 +28,7 @@ use pocketmine\network\mcpe\protocol\LevelEventPacket;
 
 class GhastShootSound implements Sound{
 
-	public function encode(?Vector3 $pos){
-		return LevelEventPacket::create(LevelEventPacket::EVENT_SOUND_GHAST_SHOOT, 0, $pos);
+	public function encode(?Vector3 $pos) : array{
+		return [LevelEventPacket::create(LevelEventPacket::EVENT_SOUND_GHAST_SHOOT, 0, $pos)];
 	}
 }
diff --git a/src/world/sound/GhastSound.php b/src/world/sound/GhastSound.php
index 484080397..b49a9c374 100644
--- a/src/world/sound/GhastSound.php
+++ b/src/world/sound/GhastSound.php
@@ -28,7 +28,7 @@ use pocketmine\network\mcpe\protocol\LevelEventPacket;
 
 class GhastSound implements Sound{
 
-	public function encode(?Vector3 $pos){
-		return LevelEventPacket::create(LevelEventPacket::EVENT_SOUND_GHAST, 0, $pos);
+	public function encode(?Vector3 $pos) : array{
+		return [LevelEventPacket::create(LevelEventPacket::EVENT_SOUND_GHAST, 0, $pos)];
 	}
 }
diff --git a/src/world/sound/IgniteSound.php b/src/world/sound/IgniteSound.php
index 4066ef189..dd72342da 100644
--- a/src/world/sound/IgniteSound.php
+++ b/src/world/sound/IgniteSound.php
@@ -28,7 +28,7 @@ use pocketmine\network\mcpe\protocol\LevelEventPacket;
 
 class IgniteSound implements Sound{
 
-	public function encode(?Vector3 $pos){
-		return LevelEventPacket::create(LevelEventPacket::EVENT_SOUND_IGNITE, 0, $pos);
+	public function encode(?Vector3 $pos) : array{
+		return [LevelEventPacket::create(LevelEventPacket::EVENT_SOUND_IGNITE, 0, $pos)];
 	}
 }
diff --git a/src/world/sound/ItemBreakSound.php b/src/world/sound/ItemBreakSound.php
index 7dd7de43b..fbe9aef77 100644
--- a/src/world/sound/ItemBreakSound.php
+++ b/src/world/sound/ItemBreakSound.php
@@ -28,7 +28,7 @@ use pocketmine\network\mcpe\protocol\LevelSoundEventPacket;
 
 class ItemBreakSound implements Sound{
 
-	public function encode(?Vector3 $pos){
-		return LevelSoundEventPacket::create(LevelSoundEventPacket::SOUND_BREAK, $pos);
+	public function encode(?Vector3 $pos) : array{
+		return [LevelSoundEventPacket::create(LevelSoundEventPacket::SOUND_BREAK, $pos)];
 	}
 }
diff --git a/src/world/sound/LaunchSound.php b/src/world/sound/LaunchSound.php
index e84a4a1de..e6772f1c9 100644
--- a/src/world/sound/LaunchSound.php
+++ b/src/world/sound/LaunchSound.php
@@ -39,7 +39,7 @@ class LaunchSound implements Sound{
 		return $this->pitch;
 	}
 
-	public function encode(?Vector3 $pos){
-		return LevelEventPacket::create(LevelEventPacket::EVENT_SOUND_SHOOT, (int) ($this->pitch * 1000), $pos);
+	public function encode(?Vector3 $pos) : array{
+		return [LevelEventPacket::create(LevelEventPacket::EVENT_SOUND_SHOOT, (int) ($this->pitch * 1000), $pos)];
 	}
 }
diff --git a/src/world/sound/NoteSound.php b/src/world/sound/NoteSound.php
index d81db980d..70228021e 100644
--- a/src/world/sound/NoteSound.php
+++ b/src/world/sound/NoteSound.php
@@ -41,7 +41,7 @@ class NoteSound implements Sound{
 		$this->note = $note;
 	}
 
-	public function encode(?Vector3 $pos){
-		return LevelSoundEventPacket::create(LevelSoundEventPacket::SOUND_NOTE, $pos, ($this->instrument->getMagicNumber() << 8) | $this->note);
+	public function encode(?Vector3 $pos) : array{
+		return [LevelSoundEventPacket::create(LevelSoundEventPacket::SOUND_NOTE, $pos, ($this->instrument->getMagicNumber() << 8) | $this->note)];
 	}
 }
diff --git a/src/world/sound/PaintingPlaceSound.php b/src/world/sound/PaintingPlaceSound.php
index cf64b248b..c836e0842 100644
--- a/src/world/sound/PaintingPlaceSound.php
+++ b/src/world/sound/PaintingPlaceSound.php
@@ -28,8 +28,8 @@ use pocketmine\network\mcpe\protocol\LevelEventPacket;
 
 class PaintingPlaceSound implements Sound{
 
-	public function encode(?Vector3 $pos){
+	public function encode(?Vector3 $pos) : array{
 		//item frame and painting have the same sound
-		return LevelEventPacket::create(LevelEventPacket::EVENT_SOUND_ITEMFRAME_PLACE, 0, $pos);
+		return [LevelEventPacket::create(LevelEventPacket::EVENT_SOUND_ITEMFRAME_PLACE, 0, $pos)];
 	}
 }
diff --git a/src/world/sound/PopSound.php b/src/world/sound/PopSound.php
index 6bec571a9..5bce1145f 100644
--- a/src/world/sound/PopSound.php
+++ b/src/world/sound/PopSound.php
@@ -39,7 +39,7 @@ class PopSound implements Sound{
 		return $this->pitch;
 	}
 
-	public function encode(?Vector3 $pos){
-		return LevelEventPacket::create(LevelEventPacket::EVENT_SOUND_POP, (int) ($this->pitch * 1000), $pos);
+	public function encode(?Vector3 $pos) : array{
+		return [LevelEventPacket::create(LevelEventPacket::EVENT_SOUND_POP, (int) ($this->pitch * 1000), $pos)];
 	}
 }
diff --git a/src/world/sound/PotionSplashSound.php b/src/world/sound/PotionSplashSound.php
index 97c1dab08..96a2f6ead 100644
--- a/src/world/sound/PotionSplashSound.php
+++ b/src/world/sound/PotionSplashSound.php
@@ -28,7 +28,7 @@ use pocketmine\network\mcpe\protocol\LevelSoundEventPacket;
 
 class PotionSplashSound implements Sound{
 
-	public function encode(?Vector3 $pos){
-		return LevelSoundEventPacket::create(LevelSoundEventPacket::SOUND_GLASS, $pos);
+	public function encode(?Vector3 $pos) : array{
+		return [LevelSoundEventPacket::create(LevelSoundEventPacket::SOUND_GLASS, $pos)];
 	}
 }
diff --git a/src/world/sound/RecordSound.php b/src/world/sound/RecordSound.php
index 1ec5c23ca..9f8bb15d1 100644
--- a/src/world/sound/RecordSound.php
+++ b/src/world/sound/RecordSound.php
@@ -36,7 +36,7 @@ class RecordSound implements Sound{
 		$this->recordType = $recordType;
 	}
 
-	public function encode(?Vector3 $pos){
-		return LevelSoundEventPacket::create($this->recordType->getSoundId(), $pos);
+	public function encode(?Vector3 $pos) : array{
+		return [LevelSoundEventPacket::create($this->recordType->getSoundId(), $pos)];
 	}
 }
diff --git a/src/world/sound/RecordStopSound.php b/src/world/sound/RecordStopSound.php
index b5f87f87f..ccb139f82 100644
--- a/src/world/sound/RecordStopSound.php
+++ b/src/world/sound/RecordStopSound.php
@@ -28,7 +28,7 @@ use pocketmine\network\mcpe\protocol\LevelSoundEventPacket;
 
 class RecordStopSound implements Sound{
 
-	public function encode(?Vector3 $pos){
-		return LevelSoundEventPacket::create(LevelSoundEventPacket::SOUND_STOP_RECORD, $pos);
+	public function encode(?Vector3 $pos) : array{
+		return [LevelSoundEventPacket::create(LevelSoundEventPacket::SOUND_STOP_RECORD, $pos)];
 	}
 }
diff --git a/src/world/sound/RedstonePowerOffSound.php b/src/world/sound/RedstonePowerOffSound.php
index f8ea474f3..d1363ed54 100644
--- a/src/world/sound/RedstonePowerOffSound.php
+++ b/src/world/sound/RedstonePowerOffSound.php
@@ -28,7 +28,7 @@ use pocketmine\network\mcpe\protocol\LevelSoundEventPacket;
 
 class RedstonePowerOffSound implements Sound{
 
-	public function encode(?Vector3 $pos){
-		return LevelSoundEventPacket::create(LevelSoundEventPacket::SOUND_POWER_OFF, $pos);
+	public function encode(?Vector3 $pos) : array{
+		return [LevelSoundEventPacket::create(LevelSoundEventPacket::SOUND_POWER_OFF, $pos)];
 	}
 }
diff --git a/src/world/sound/RedstonePowerOnSound.php b/src/world/sound/RedstonePowerOnSound.php
index c01ee10b4..eaea5f617 100644
--- a/src/world/sound/RedstonePowerOnSound.php
+++ b/src/world/sound/RedstonePowerOnSound.php
@@ -28,7 +28,7 @@ use pocketmine\network\mcpe\protocol\LevelSoundEventPacket;
 
 class RedstonePowerOnSound implements Sound{
 
-	public function encode(?Vector3 $pos){
-		return LevelSoundEventPacket::create(LevelSoundEventPacket::SOUND_POWER_ON, $pos);
+	public function encode(?Vector3 $pos) : array{
+		return [LevelSoundEventPacket::create(LevelSoundEventPacket::SOUND_POWER_ON, $pos)];
 	}
 }
diff --git a/src/world/sound/Sound.php b/src/world/sound/Sound.php
index e44c0ecce..84121db6a 100644
--- a/src/world/sound/Sound.php
+++ b/src/world/sound/Sound.php
@@ -29,7 +29,7 @@ use pocketmine\network\mcpe\protocol\ClientboundPacket;
 interface Sound{
 
 	/**
-	 * @return ClientboundPacket|ClientboundPacket[]
+	 * @return ClientboundPacket[]
 	 */
-	public function encode(?Vector3 $pos);
+	public function encode(?Vector3 $pos) : array;
 }
diff --git a/src/world/sound/ThrowSound.php b/src/world/sound/ThrowSound.php
index feb0ca724..65c5079af 100644
--- a/src/world/sound/ThrowSound.php
+++ b/src/world/sound/ThrowSound.php
@@ -28,7 +28,7 @@ use pocketmine\network\mcpe\protocol\LevelSoundEventPacket;
 
 class ThrowSound implements Sound{
 
-	public function encode(?Vector3 $pos){
-		return LevelSoundEventPacket::create(LevelSoundEventPacket::SOUND_THROW, $pos, -1, "minecraft:player");
+	public function encode(?Vector3 $pos) : array{
+		return [LevelSoundEventPacket::create(LevelSoundEventPacket::SOUND_THROW, $pos, -1, "minecraft:player")];
 	}
 }
diff --git a/src/world/sound/TotemUseSound.php b/src/world/sound/TotemUseSound.php
index 064008942..baa04275c 100644
--- a/src/world/sound/TotemUseSound.php
+++ b/src/world/sound/TotemUseSound.php
@@ -28,7 +28,7 @@ use pocketmine\network\mcpe\protocol\LevelEventPacket;
 
 class TotemUseSound implements Sound{
 
-	public function encode(?Vector3 $pos){
-		return LevelEventPacket::create(LevelEventPacket::EVENT_SOUND_TOTEM, 0, $pos);
+	public function encode(?Vector3 $pos) : array{
+		return [LevelEventPacket::create(LevelEventPacket::EVENT_SOUND_TOTEM, 0, $pos)];
 	}
 }
diff --git a/src/world/sound/XpCollectSound.php b/src/world/sound/XpCollectSound.php
index f87c2719f..71a304f30 100644
--- a/src/world/sound/XpCollectSound.php
+++ b/src/world/sound/XpCollectSound.php
@@ -28,7 +28,7 @@ use pocketmine\network\mcpe\protocol\LevelEventPacket;
 
 class XpCollectSound implements Sound{
 
-	public function encode(?Vector3 $pos){
-		return LevelEventPacket::create(LevelEventPacket::EVENT_SOUND_ORB, 0, $pos);
+	public function encode(?Vector3 $pos) : array{
+		return [LevelEventPacket::create(LevelEventPacket::EVENT_SOUND_ORB, 0, $pos)];
 	}
 }
diff --git a/src/world/sound/XpLevelUpSound.php b/src/world/sound/XpLevelUpSound.php
index 837067446..abc41fef7 100644
--- a/src/world/sound/XpLevelUpSound.php
+++ b/src/world/sound/XpLevelUpSound.php
@@ -41,9 +41,9 @@ class XpLevelUpSound implements Sound{
 		return $this->xpLevel;
 	}
 
-	public function encode(?Vector3 $pos){
+	public function encode(?Vector3 $pos) : array{
 		//No idea why such odd numbers, but this works...
 		//TODO: check arbitrary volume
-		return LevelSoundEventPacket::create(LevelSoundEventPacket::SOUND_LEVELUP, $pos, 0x10000000 * intdiv(min(30, $this->xpLevel), 5));
+		return [LevelSoundEventPacket::create(LevelSoundEventPacket::SOUND_LEVELUP, $pos, 0x10000000 * intdiv(min(30, $this->xpLevel), 5))];
 	}
 }