Bumped default sample rate for generating computer speaker beeps to avoid artifacts and made it a setting.

src/main/resources/application.conf

@@ -105,6 +105,13 @@ opencomputers {
       #            importantly, can only render code page 437 (as opposed to...
       #            a *lot* of unicode).
       fontRenderer: "unifont"
+
+      # The sample rate used for generating beeps of computers' internal
+      # speakers. Use custom values at your own responsibility here; if it
+      # breaks OC you'll get no support. Some potentially reasonable
+      # lower values are 16000 or even 8000 (which was the old default, but
+      # leads to artifacting on certain frequencies).
+      beepSampleRate: 44100
   }
 
   # Computer related settings, concerns server performance and security.

src/main/scala/li/cil/oc/Settings.scala

@@ -49,6 +49,7 @@ class Settings(val config: Config) {
   }
   val monochromeColor = Integer.decode(config.getString("client.monochromeColor"))
   val fontRenderer = config.getString("client.fontRenderer")
+  val beepSampleRate = config.getInt("client.beepSampleRate")
 
   // ----------------------------------------------------------------------- //
   // computer

src/main/scala/li/cil/oc/util/Audio.scala

@@ -6,6 +6,7 @@ import cpw.mods.fml.common.FMLCommonHandler
 import cpw.mods.fml.common.eventhandler.SubscribeEvent
 import cpw.mods.fml.common.gameevent.TickEvent.ClientTickEvent
 import li.cil.oc.OpenComputers
+import li.cil.oc.Settings
 import net.minecraft.client.Minecraft
 import net.minecraft.client.audio.SoundCategory
 import org.lwjgl.BufferUtils
@@ -23,7 +24,7 @@ import scala.collection.mutable
  * tick handler.
  */
 object Audio {
-  private def sampleRate = 8000
+  private def sampleRate = Settings.get.beepSampleRate
 
   private val sources = mutable.Set.empty[Source]