Audio class should be static

There's no need for instance methods.

Audio.cs

@@ -3,21 +3,20 @@ using System.Collections.Generic;
 using System.IO;
 using System.Reflection;
 using System.Runtime.InteropServices;
-using System.CodeDom.Compiler;
 
 namespace BabySmash
 {
-    public class Win32Audio
+    public static class Win32Audio
     {
         /// <summary>
         /// Collection of soundname->WAV bytes mappings
         /// </summary>
-        public static Dictionary<string, byte[]> cachedWavs = new Dictionary<string, byte[]>();
+        private static Dictionary<string, byte[]> cachedWavs = new Dictionary<string, byte[]>();
 
         /// <summary>
         /// Lock this object to protect against concurrent writes to the cachedWavs collection.
         /// </summary>
-        public static object cachedWavsLock = new object();
+        private static object cachedWavsLock = new object();
 
         #region NativeAPI
         private const UInt32 SND_ASYNC = 0x0001;
@@ -30,20 +29,22 @@ namespace BabySmash
 
         #endregion NativeAPI
 
-        public void PlayWavResource(string wav)
+        public static void PlayWavResource(string wav)
         {
             byte[] arrWav = GetWavResource(wav);
             PlaySound(arrWav, IntPtr.Zero, SND_ASYNC | SND_MEMORY);
         }
 
-        public void PlayWavResourceYield(string wav)
+        public static void PlayWavResourceYield(string wav)
         {
             byte[] arrWav = GetWavResource(wav);
             PlaySound(arrWav, IntPtr.Zero, SND_ASYNC | SND_NOSTOP | SND_MEMORY);
         }
 
-        private byte[] GetWavResource(string wav)
+        private static byte[] GetWavResource(string wav)
         {
+            wav = ".Resources.Sounds." + wav;
+
             if (cachedWavs.ContainsKey(wav))
             {
                 return cachedWavs[wav];

Controller.cs

@@ -33,7 +33,7 @@ namespace BabySmash
       private bool isDrawing = false;
       private readonly SpeechSynthesizer objSpeech = new SpeechSynthesizer();
       private readonly List<MainWindow> windows = new List<MainWindow>();
-      private readonly Win32Audio audio = new Win32Audio();
+
       private DispatcherTimer timer = new DispatcherTimer();
       private Queue<Shape> ellipsesQueue = new Queue<Shape>();
       private Dictionary<string,Queue<UserControl>> ellipsesUserControlQueue = new Dictionary<string,Queue<UserControl>>();
@@ -138,7 +138,7 @@ namespace BabySmash
          windows[0].infoLabel.Visibility = Visibility.Visible;
 
          //Startup sound
-         audio.PlayWavResourceYield(".Resources.Sounds." + "EditedJackPlaysBabySmash.wav");
+         Win32Audio.PlayWavResourceYield("EditedJackPlaysBabySmash.wav");
 
          string[] args = Environment.GetCommandLineArgs();
          string ext = System.IO.Path.GetExtension(System.Reflection.Assembly.GetExecutingAssembly().CodeBase);
@@ -308,7 +308,7 @@ namespace BabySmash
 
       private void PlayLaughter()
       {
-         audio.PlayWavResource(Utils.GetRandomSoundFile());
+          Win32Audio.PlayWavResource(Utils.GetRandomSoundFile());
       }
 
       private void SpeakString(string s)
@@ -390,18 +390,18 @@ namespace BabySmash
          isDrawing = true;
          main.CaptureMouse();
 
-         audio.PlayWavResource(".Resources.Sounds." + "smallbumblebee.wav");
+         Win32Audio.PlayWavResource("smallbumblebee.wav");
       }
 
       public void MouseWheel(MainWindow main, MouseWheelEventArgs e)
       {
          if (e.Delta > 0)
          {
-            audio.PlayWavResourceYield(".Resources.Sounds." + "rising.wav");
+             Win32Audio.PlayWavResourceYield("rising.wav");
          }
          else
          {
-            audio.PlayWavResourceYield(".Resources.Sounds." + "falling.wav");
+             Win32Audio.PlayWavResourceYield("falling.wav");
          }
       }
 
@@ -453,7 +453,7 @@ namespace BabySmash
          Canvas.SetTop(shape, p.Y - 25);
 
          if (Settings.Default.MouseDraw)
-            audio.PlayWavResourceYield(".Resources.Sounds." + "smallbumblebee.wav");
+            Win32Audio.PlayWavResourceYield("smallbumblebee.wav");
 
          if (ellipsesQueue.Count > 30) //this is arbitrary
          {

Utils.cs

@@ -11,7 +11,8 @@ namespace BabySmash
    internal static class Utils
    {
       private static readonly Dictionary<Color, string> brushToString;
-      private static readonly Random lRandom = new Random();
+
+      private static readonly Random lRandom = new Random(); // BUG BUG: Believe it or not, Random is NOT THREAD SAFE!
 
       private static readonly FunCursor1 fun1 = new FunCursor1();
       private static readonly FunCursor2 fun2 = new FunCursor2();
@@ -80,8 +81,7 @@ namespace BabySmash
 
       public static string GetRandomSoundFile()
       {
-         string retVal = sounds[lRandom.Next(0, sounds.Length)];
-         return ".Resources.Sounds." + retVal;
+         return sounds[lRandom.Next(0, sounds.Length)];
       }
 
       public static bool GetRandomBoolean()