big worky on sequencer and launcher

src/device/track.rs

@@ -8,11 +8,12 @@ impl Track {
     pub fn new (
         name:    &str,
         tempo:   &Arc<Timebase>,
-        devices: Vec<Box<dyn Device>>
+        devices: Option<Vec<Box<dyn Device>>>,
+        phrases: Option<Vec<Phrase>>,
     ) -> Usually<Self> {
         Ok(Self {
             name:      name.to_string(),
-            sequencer: Sequencer::new(&name, tempo, None)?,
+            sequencer: Sequencer::new(&name, tempo, phrases)?,
             chain:     Chain::new(&name, devices)?,
         })
     }