Tidy muting code.

OpenRA.Game/Sound/Sound.cs

@@ -43,6 +43,9 @@ namespace OpenRA
 		public Sound(IPlatform platform, SoundSettings soundSettings)
 		{
 			soundEngine = platform.CreateSound(soundSettings.Device);
+
+			if (soundSettings.Mute)
+				MuteAudio();
 		}
 
 		ISoundSource LoadSound(ISoundLoader[] loaders, IReadOnlyFileSystem fileSystem, string filename)
@@ -223,12 +226,6 @@ namespace OpenRA
 			soundEngine.PauseSound(music, true);
 		}
 
-		public float GlobalVolume
-		{
-			get { return soundEngine.Volume; }
-			set { soundEngine.Volume = value; }
-		}
-
 		float soundVolumeModifier = 1.0f;
 		public float SoundVolumeModifier
 		{

OpenRA.Platforms.Default/OpenAlSoundEngine.cs

@@ -207,9 +207,6 @@ namespace OpenRA.Platforms.Default
 			if (!TryGetSourceFromPool(out source))
 				return null;
 
-			if (Game.Settings.Sound.Mute)
-				Game.Sound.MuteAudio();
-
 			var slot = sourcePool[source];
 			slot.Pos = pos;
 			slot.FrameStarted = currFrame;