diff --git a/DMX-2.0/SequenceurSon.cs b/DMX-2.0/SequenceurSon.cs
index f997f89..a63b0a2 100644
--- a/DMX-2.0/SequenceurSon.cs
+++ b/DMX-2.0/SequenceurSon.cs
@@ -107,9 +107,10 @@ namespace DMX2
 			set{
 				if(element==null) return;
 				if(element.CurrentState != Gst.State.Paused && element.CurrentState != Gst.State.Playing){
-					lock(taskQueue)taskQueue.Enqueue(delegate(){
-						PlayTime = value;
-					});
+					lock(this)
+						taskQueue.Enqueue(delegate(){
+							PlayTime = value;
+						});
 					return;
 				}
 				long pos = (long)(value.TotalMilliseconds) * 1000000;
@@ -122,12 +123,12 @@ namespace DMX2
 		public TimeSpan Duration {
 			get {
 				if(element==null) return TimeSpan.Zero;
-				if(duration == TimeSpan.Zero) {
+				//if(duration == TimeSpan.Zero) {
 					Gst.Format format = Gst.Format.Time ; 
 					long dur;
 					element.QueryDuration(ref format, out dur);
 					duration = TimeSpan.FromMilliseconds(dur/1000000);
-				}
+				//}
 				return duration;
 			}
 		}
@@ -162,9 +163,10 @@ namespace DMX2
 		{
 			if(element == null)return;
 			if(element.CurrentState != Gst.State.Paused && element.CurrentState != Gst.State.Playing){
-				lock(taskQueue)taskQueue.Enqueue(delegate(){
-					Play();
-				});
+				lock(this)
+					taskQueue.Enqueue(delegate(){
+						Play();
+					});
 				return;
 			}
 
@@ -211,7 +213,7 @@ namespace DMX2
 
 		void UiDestroyed (object sender, EventArgs e)
 		{
-			//throw new NotImplementedException ();
+			ui=null;
 		}
 		public override int ValeurCircuit (Circuit c)
 		{
@@ -221,7 +223,9 @@ namespace DMX2
 		public override void Tick (TimeSpan time)
 		{
 			if(element!=null && taskQueue.Count>0)
-				lock(taskQueue)taskQueue.Dequeue()();
+				if(element.CurrentState == Gst.State.Paused || element.CurrentState == Gst.State.Playing)
+					lock(this)
+						taskQueue.Dequeue()();
 
 			if (fading != TimeSpan.Zero) {
 				fading-=time;
@@ -282,7 +286,7 @@ namespace DMX2
 			System.Text.RegularExpressions.RegexOptions.Compiled);
 
 		static System.Text.RegularExpressions.Regex regexCommand2 = new System.Text.RegularExpressions.Regex(
-			@"(?<file>\d+)(?<params>[gvp](.+)?)?",
+			@"^(?<file>\d+)(?<params>[gvp](.+)?)?",
 			System.Text.RegularExpressions.RegexOptions.Compiled);