diff --git a/tek/src/arranger.edn b/tek/src/arranger.edn
index 351737e6..1d1ac948 100644
--- a/tek/src/arranger.edn
+++ b/tek/src/arranger.edn
@@ -1,3 +1,3 @@
 (bsp/s :toolbar
-  (fill/x (align/c 
-    (bsp/s :outputs (bsp/s :inputs (bsp/s :tracks :scenes)))))))
+  (fill/x (align/c (bsp/w :pool
+    (bsp/n :outputs (bsp/n :inputs (bsp/n :tracks :scenes)))))))
diff --git a/tek/src/arranger/arranger_track.rs b/tek/src/arranger/arranger_track.rs
index c3e5c2ff..4f0d9f47 100644
--- a/tek/src/arranger/arranger_track.rs
+++ b/tek/src/arranger/arranger_track.rs
@@ -40,7 +40,13 @@ impl Arranger {
             name,
         };
         self.tracks.push(track);
-        let index = self.tracks.len() - 1;
+        let len = self.tracks.len();
+        let index = len - 1;
+        for scene in self.scenes.iter_mut() {
+            while scene.clips.len() < len {
+                scene.clips.push(None);
+            }
+        }
         Ok(&mut self.tracks[index])
     }
     pub fn track_del (&mut self, index: usize) {