extract Sequencer model

src/edn.rs

@@ -172,7 +172,7 @@ impl Track {
             _ => {}
         });
         let track = app.arranger.track_add(name)?;
-        for phrase in phrases { track.phrases.push(phrase); }
+        for phrase in phrases { track.phrases.push(Arc::new(RwLock::new(phrase))); }
         for device in devices { track.add_device(device)?; }
         Ok(track)
     }