compact sampler

src/device/launcher/handle.rs

@@ -17,7 +17,12 @@ pub fn handle (state: &mut Launcher, event: &AppEvent) -> Usually<bool> {
             }
         },
         LauncherView::Chains => {
-            true
+            let i = state.col().saturating_sub(1);
+            if let Some(track) = state.tracks.get_mut(i) {
+                crate::device::chain::handle(&mut *track.chain.state(), event)?
+            } else {
+                true
+            }
         }
     })
 }