struct Track; load Sampler in Launcher

src/device/track.rs

@@ -0,0 +1,27 @@
+use crate::prelude::*;
+pub struct Track {
+    pub name:      String,
+    pub sequencer: DynamicDevice<Sequencer>,
+    pub chain:     DynamicDevice<Chain>,
+}
+impl Track {
+    pub fn new (
+        name:    &str,
+        tempo:   &Arc<Timebase>,
+        devices: Vec<Box<dyn Device>>
+    ) -> Usually<Self> {
+        Ok(Self {
+            name:      name.to_string(),
+            sequencer: Sequencer::new(&name, tempo, None)?,
+            chain:     Chain::new(&name, devices)?,
+        })
+    }
+}
+impl PortList for Track {
+    fn midi_ins (&self) -> Usually<Vec<String>> {
+        self.sequencer.midi_ins()
+    }
+    fn audio_outs (&self) -> Usually<Vec<String>> {
+        self.chain.audio_outs()
+    }
+}