fix StaticSoundInstance race condition and state

lib/FAudio

@@ -1 +1 @@
-Subproject commit 63071f2c309f6fc2193de1c6b85da0e31df80040
+Subproject commit 590cc3537f64d3b118f0001a2f2c111fcbd2b23f

src/Audio/StaticSound.cs

@@ -274,10 +274,11 @@ namespace MoonWorks.Audio
 		{
 			if (AvailableInstances.Count == 0)
 			{
-				AvailableInstances.Push(new StaticSoundInstance(Device, this, autoFree));
+				AvailableInstances.Push(new StaticSoundInstance(Device, this));
 			}
 
 			var instance = AvailableInstances.Pop();
+			instance.AutoFree = autoFree;
 			UsedInstances.Add(instance);
 			return instance;
 		}

src/Audio/StaticSoundInstance.cs

@@ -32,21 +32,14 @@ namespace MoonWorks.Audio
 			}
 		}
 
-		public bool AutoFree { get; }
+		public bool AutoFree { get; internal set; }
 
 		internal StaticSoundInstance(
 			AudioDevice device,
-			StaticSound parent,
+			StaticSound parent
-			bool autoFree
 		) : base(device, parent.FormatTag, parent.BitsPerSample, parent.BlockAlign, parent.Channels, parent.SamplesPerSecond)
 		{
 			Parent = parent;
-			AutoFree = autoFree;
-
-			if (AutoFree)
-			{
-				device.AddAutoFreeStaticSoundInstance(this);
-			}
 		}
 
 		public override void Play()
@@ -87,6 +80,11 @@ namespace MoonWorks.Audio
 
 			FAudio.FAudioSourceVoice_Start(Voice, 0, operationSet);
 			State = SoundState.Playing;
+
+			if (AutoFree)
+			{
+				Device.AddAutoFreeStaticSoundInstance(this);
+			}
 		}
 
 		public override void Pause()