Made _activeBuffers volatile witin the WaveOut class. This is done be…

…cause the WaitForBuffersToFinish was getting stuck in a hard loop based on the _activeBuffers not being volatile.

CSCore/SoundOut/WaveOut.cs

@@ -17,7 +17,7 @@ public class WaveOut : ISoundOut
         private readonly WaveCallback _callback;
         private readonly Queue<int> _failedBuffers = new Queue<int>();
         private readonly object _lockObject = new object();
-        private int _activeBuffers;
+        private volatile int _activeBuffers;
         private WaveOutBuffer[] _buffers;
         private Thread _callbackThread;
         private WaveOutDevice _device;
@@ -465,7 +465,6 @@ private void StopFromCallback(Exception exception)
 
         private void WaitForBuffersToFinish()
         {
-            //do we have volatile to _activeBuffers???
             while (Interlocked.CompareExchange(ref _activeBuffers, 0, 0) != 0 && PlaybackState != PlaybackState.Stopped)
             {
                 Thread.Sleep(10);