sampler: wip: add play_sample and stop_sample

crates/device/src/sampler/sampler_api.rs

@@ -81,6 +81,16 @@ impl SamplerCommand {
         sampler.recording = None;
         Ok(None)
     }
+    fn play_sample (sampler: &mut Sampler, pitch: usize) -> Perhaps<Self> {
+        if let Some(ref sample) = sampler.mapped[pitch] {
+            sampler.voices.write().unwrap().push(Sample::play(sample, 0, &u7::from(128)));
+        }
+        Ok(None)
+    }
+    fn stop_sample (sampler: &mut Sampler, pitch: usize) -> Perhaps<Self> {
+        todo!();
+        Ok(None)
+    }
     //fn select (&self, state: &mut Sampler, i: usize) -> Option<Self> {
         //Self::Select(state.set_note_pos(i))
     //}