diff --git a/src/main/resources/application.conf b/src/main/resources/application.conf
index 593b7237c..fe45447c6 100644
--- a/src/main/resources/application.conf
+++ b/src/main/resources/application.conf
@@ -97,6 +97,9 @@ opencomputers {
     # range of [0, 127], where 0 means mute (the sound will not even be
     # generated), and 127 means maximum amplitude / volume.
     beepVolume: 32
+
+    # The radius in which computer beeps can be heard.
+    beepRadius: 16
   }
 
   # Computer related settings, concerns server performance and security.
diff --git a/src/main/scala/li/cil/oc/Settings.scala b/src/main/scala/li/cil/oc/Settings.scala
index ec5341f33..146977bc2 100644
--- a/src/main/scala/li/cil/oc/Settings.scala
+++ b/src/main/scala/li/cil/oc/Settings.scala
@@ -37,6 +37,7 @@ class Settings(val config: Config) {
   val fontRenderer = config.getString("client.fontRenderer")
   val beepSampleRate = config.getInt("client.beepSampleRate")
   val beepAmplitude = config.getInt("client.beepVolume") max 0 min Byte.MaxValue
+  val beepRadius = config.getDouble("client.beepRadius").toFloat max 1 min 32
 
   // ----------------------------------------------------------------------- //
   // computer
diff --git a/src/main/scala/li/cil/oc/server/PacketSender.scala b/src/main/scala/li/cil/oc/server/PacketSender.scala
index f0d639768..e01552273 100644
--- a/src/main/scala/li/cil/oc/server/PacketSender.scala
+++ b/src/main/scala/li/cil/oc/server/PacketSender.scala
@@ -586,7 +586,7 @@ object PacketSender {
     pb.writeShort(frequency.toShort)
     pb.writeShort(duration.toShort)
 
-    pb.sendToNearbyPlayers(world, x, y, z, Option(16))
+    pb.sendToNearbyPlayers(world, x, y, z, Option(32))
   }
 
   def sendSound(world: World, x: Double, y: Double, z: Double, pattern: String) {
@@ -599,7 +599,7 @@ object PacketSender {
     pb.writeInt(blockPos.z)
     pb.writeUTF(pattern)
 
-    pb.sendToNearbyPlayers(world, x, y, z, Option(16))
+    pb.sendToNearbyPlayers(world, x, y, z, Option(32))
   }
 
   def sendWaypointLabel(t: Waypoint): Unit = {
diff --git a/src/main/scala/li/cil/oc/server/component/Agent.scala b/src/main/scala/li/cil/oc/server/component/Agent.scala
index 5c92ef30f..6dd6c5337 100644
--- a/src/main/scala/li/cil/oc/server/component/Agent.scala
+++ b/src/main/scala/li/cil/oc/server/component/Agent.scala
@@ -70,7 +70,7 @@ trait Agent extends traits.WorldControl with traits.InventoryControl with traits
   @Callback(doc = "function():string -- Get the name of the agent.")
   def name(context: Context, args: Arguments): Array[AnyRef] = result(agent.name)
 
-  @Callback
+  @Callback(doc = "function(side:number[, face:number=side[, sneaky:boolean=false]]):boolean, string -- Perform a 'left click' towards the specified side. The `face' allows a more precise click calibration, and is relative to the targeted blockspace.")
   def swing(context: Context, args: Arguments): Array[AnyRef] = {
     // Swing the equipped tool (left click).
     val facing = checkSideForAction(args, 0)
@@ -154,7 +154,7 @@ trait Agent extends traits.WorldControl with traits.InventoryControl with traits
     result(false, reason.orNull)
   }
 
-  @Callback
+  @Callback(doc = "function(side:number[, face:number=side[, sneaky:boolean=false[, duration:number=0]]]):boolean, string -- Perform a 'right click' towards the specified side. The `face' allows a more precise click calibration, and is relative to the targeted blockspace.")
   def use(context: Context, args: Arguments): Array[AnyRef] = {
     val facing = checkSideForAction(args, 0)
     val sides =
@@ -233,7 +233,7 @@ trait Agent extends traits.WorldControl with traits.InventoryControl with traits
     result(false)
   }
 
-  @Callback
+  @Callback(doc = "function(side:number[, face:number=side[, sneaky:boolean=false]]):boolean -- Place a block towards the specified side. The `face' allows a more precise click calibration, and is relative to the targeted blockspace.")
   def place(context: Context, args: Arguments): Array[AnyRef] = {
     val facing = checkSideForAction(args, 0)
     val sides =
diff --git a/src/main/scala/li/cil/oc/server/component/traits/InventoryWorldControl.scala b/src/main/scala/li/cil/oc/server/component/traits/InventoryWorldControl.scala
index 46423a470..f01f866d1 100644
--- a/src/main/scala/li/cil/oc/server/component/traits/InventoryWorldControl.scala
+++ b/src/main/scala/li/cil/oc/server/component/traits/InventoryWorldControl.scala
@@ -12,7 +12,7 @@ import net.minecraft.item.ItemBlock
 import net.minecraft.util.EnumFacing
 
 trait InventoryWorldControl extends InventoryAware with WorldAware with SideRestricted {
-  @Callback
+  @Callback(doc = "function(side:number):boolean -- Compare the block on the specified side with the one in the selected slot. Returns true if equal.")
   def compare(context: Context, args: Arguments): Array[AnyRef] = {
     val side = checkSideForAction(args, 0)
     stackInSlot(selectedSlot) match {
@@ -30,7 +30,7 @@ trait InventoryWorldControl extends InventoryAware with WorldAware with SideRest
     result(false)
   }
 
-  @Callback
+  @Callback(doc = "function(side:number[, count:number=64]):boolean -- Drops items from the selected slot towards the specified side.")
   def drop(context: Context, args: Arguments): Array[AnyRef] = {
     val facing = checkSideForAction(args, 0)
     val count = args.optionalItemCount(1)
@@ -66,7 +66,7 @@ trait InventoryWorldControl extends InventoryAware with WorldAware with SideRest
     else result(false)
   }
 
-  @Callback
+  @Callback(doc = "function(side:number[, count:number=64]):boolean -- Suck up items from the specified side.")
   def suck(context: Context, args: Arguments): Array[AnyRef] = {
     val facing = checkSideForAction(args, 0)
     val count = args.optionalItemCount(1)
diff --git a/src/main/scala/li/cil/oc/server/component/traits/TankControl.scala b/src/main/scala/li/cil/oc/server/component/traits/TankControl.scala
index cb4cc3ba2..a57293d32 100644
--- a/src/main/scala/li/cil/oc/server/component/traits/TankControl.scala
+++ b/src/main/scala/li/cil/oc/server/component/traits/TankControl.scala
@@ -7,10 +7,10 @@ import li.cil.oc.util.ExtendedArguments._
 import li.cil.oc.util.ResultWrapper.result
 
 trait TankControl extends TankAware {
-  @Callback
+  @Callback(doc = "function():number -- The number of tanks installed in the device.")
   def tankCount(context: Context, args: Arguments): Array[AnyRef] = result(tank.tankCount)
 
-  @Callback
+  @Callback(doc = "function([index:number]):number -- Select a tank and/or get the number of the currently selected tank.")
   def selectTank(context: Context, args: Arguments): Array[AnyRef] = {
     if (args.count > 0 && args.checkAny(0) != null) {
       selectedTank = args.checkTank(tank, 0)
@@ -18,7 +18,7 @@ trait TankControl extends TankAware {
     result(selectedTank + 1)
   }
 
-  @Callback(direct = true)
+  @Callback(direct = true, doc = "function([index:number]):number -- Get the fluid amount in the specified or selected tank.")
   def tankLevel(context: Context, args: Arguments): Array[AnyRef] = {
     val index =
       if (args.count > 0 && args.checkAny(0) != null) args.checkTank(tank, 0)
@@ -29,7 +29,7 @@ trait TankControl extends TankAware {
     })
   }
 
-  @Callback(direct = true)
+  @Callback(direct = true, doc = "function([index:number]):number -- Get the remaining fluid capacity in the specified or selected tank.")
   def tankSpace(context: Context, args: Arguments): Array[AnyRef] = {
     val index =
       if (args.count > 0 && args.checkAny(0) != null) args.checkTank(tank, 0)
@@ -40,7 +40,7 @@ trait TankControl extends TankAware {
     })
   }
 
-  @Callback
+  @Callback(doc = "function(index:number):boolean -- Compares the fluids in the selected and the specified tank. Returns true if equal.")
   def compareFluidTo(context: Context, args: Arguments): Array[AnyRef] = {
     val index = args.checkTank(tank, 0)
     result((fluidInTank(selectedTank), fluidInTank(index)) match {
@@ -50,7 +50,7 @@ trait TankControl extends TankAware {
     })
   }
 
-  @Callback
+  @Callback(doc = "function(index:number[, count:number=1000]):boolean -- Move the specified amount of fluid from the selected tank into the specified tank.")
   def transferFluidTo(context: Context, args: Arguments): Array[AnyRef] = {
     val index = args.checkTank(tank, 0)
     val count = args.optionalFluidCount(1)
diff --git a/src/main/scala/li/cil/oc/server/component/traits/TankWorldControl.scala b/src/main/scala/li/cil/oc/server/component/traits/TankWorldControl.scala
index 5f07e7892..5024723bb 100644
--- a/src/main/scala/li/cil/oc/server/component/traits/TankWorldControl.scala
+++ b/src/main/scala/li/cil/oc/server/component/traits/TankWorldControl.scala
@@ -14,7 +14,7 @@ import net.minecraftforge.fluids.IFluidBlock
 import net.minecraftforge.fluids.IFluidHandler
 
 trait TankWorldControl extends TankAware with WorldAware with SideRestricted {
-  @Callback
+  @Callback(doc = "function(side:number):boolean -- Compare the fluid in the selected tank with the fluid on the specified side. Returns true if equal.")
   def compareFluid(context: Context, args: Arguments): Array[AnyRef] = {
     val side = checkSideForAction(args, 0)
     fluidInTank(selectedTank) match {
@@ -33,7 +33,7 @@ trait TankWorldControl extends TankAware with WorldAware with SideRestricted {
     }
   }
 
-  @Callback
+  @Callback(doc = "function(side:boolean[, amount:number=1000]):boolean, number or string -- Drains the specified amount of fluid from the specified side. Returns the amount drained, or an error message.")
   def drain(context: Context, args: Arguments): Array[AnyRef] = {
     val facing = checkSideForAction(args, 0)
     val count = args.optionalFluidCount(1)
@@ -94,7 +94,7 @@ trait TankWorldControl extends TankAware with WorldAware with SideRestricted {
     }
   }
 
-  @Callback
+  @Callback(doc = "function(side:number[, amount:number=1000]):boolean, number of string -- Eject the specified amount of fluid to the specified side. Returns the amount ejected or an error message.")
   def fill(context: Context, args: Arguments): Array[AnyRef] = {
     val facing = checkSideForAction(args, 0)
     val count = args.optionalFluidCount(1)
diff --git a/src/main/scala/li/cil/oc/server/component/traits/WorldControl.scala b/src/main/scala/li/cil/oc/server/component/traits/WorldControl.scala
index 2e0c657f6..a0076068e 100644
--- a/src/main/scala/li/cil/oc/server/component/traits/WorldControl.scala
+++ b/src/main/scala/li/cil/oc/server/component/traits/WorldControl.scala
@@ -6,7 +6,7 @@ import li.cil.oc.api.machine.Context
 import li.cil.oc.util.ResultWrapper.result
 
 trait WorldControl extends WorldAware with SideRestricted {
-  @Callback
+  @Callback(doc = "function(side:number):boolean, string -- Checks the contents of the block on the specified sides and returns the findings.")
   def detect(context: Context, args: Arguments): Array[AnyRef] = {
     val side = checkSideForAction(args, 0)
     val (something, what) = blockContent(side)
diff --git a/src/main/scala/li/cil/oc/util/Audio.scala b/src/main/scala/li/cil/oc/util/Audio.scala
index 1a8b645c2..144ecffa8 100644
--- a/src/main/scala/li/cil/oc/util/Audio.scala
+++ b/src/main/scala/li/cil/oc/util/Audio.scala
@@ -30,6 +30,8 @@ object Audio {
 
   private def amplitude = Settings.get.beepAmplitude
 
+  private def maxDistance = Settings.get.beepRadius
+
   private val sources = mutable.Set.empty[Source]
 
   private def volume = Minecraft.getMinecraft.gameSettings.getSoundLevel(SoundCategory.BLOCKS)
@@ -42,7 +44,7 @@ object Audio {
 
   def play(x: Float, y: Float, z: Float, pattern: String, frequencyInHz: Int = 1000, durationInMilliseconds: Int = 200): Unit = {
     val mc = Minecraft.getMinecraft
-    val distanceBasedGain = math.max(0, 1 - mc.thePlayer.getDistance(x, y, z) / 12).toFloat
+    val distanceBasedGain = math.max(0, 1 - mc.thePlayer.getDistance(x, y, z) / maxDistance).toFloat
     val gain = distanceBasedGain * volume
     if (gain <= 0 || amplitude <= 0) return
 
@@ -142,6 +144,8 @@ object Audio {
           checkALError()
 
           AL10.alSource3f(source, AL10.AL_POSITION, x, y, z)
+          AL10.alSourcef(source, AL10.AL_REFERENCE_DISTANCE, maxDistance)
+          AL10.alSourcef(source, AL10.AL_MAX_DISTANCE, maxDistance)
           AL10.alSourcef(source, AL10.AL_GAIN, gain * 0.3f)
           checkALError()