wait until rec streams have stopped (max 5ms) before starting new ones

Vocaluxe/Lib/Sound/CPortAudioRecord.cs

@@ -119,6 +119,16 @@ namespace Vocaluxe.Lib.Sound
                 _Buffer[i].Reset();
             }
 
+            for (int i = 0; i < _recHandle.Length; i++)
+            {
+                int waitcount = 0;
+                while (waitcount < 5 && PortAudio.Pa_IsStreamStopped(_recHandle[i]) == PortAudio.PaError.paStreamIsNotStopped)
+                {
+                    System.Threading.Thread.Sleep(1);
+                    waitcount++;
+                }
+            }
+
             for (int i = 0; i < _recHandle.Length; i++)
             {
                 _recHandle[i] = IntPtr.Zero;