diff --git a/demos/project.edn b/demos/project.edn
index 288d577d..863978b3 100644
--- a/demos/project.edn
+++ b/demos/project.edn
@@ -1,7 +1,7 @@
 (bpm 150)
 
 (midi-in "nanoKEY Studio.*capture.*")
-(audio-out "Komplete.+:playback_FL", "Komplete.+:playback_FR")
+(audio-out "Built-.+:playback_FL", "Built-.+:playback_FR")
 
 (scene { :name "Intro"  } 0 0 _ _)
 (scene { :name "Hook"   } 1 1 0 _)
diff --git a/src/devices/sampler.rs b/src/devices/sampler.rs
index 115213f7..387400b2 100644
--- a/src/devices/sampler.rs
+++ b/src/devices/sampler.rs
@@ -11,7 +11,7 @@ pub struct Sampler {
     pub editing:     Option<Arc<RwLock<Sample>>>,
     pub mapped:      BTreeMap<u7, Arc<RwLock<Sample>>>,
     pub unmapped:    Vec<Arc<RwLock<Sample>>>,
-    pub voices:      Vec<Voice>,
+    pub voices:      Arc<RwLock<Vec<Voice>>>,
     pub ports:       JackPorts,
     pub buffer:      Vec<Vec<f32>>,
     pub output_gain: f32
@@ -20,7 +20,7 @@ pub struct Sampler {
 render!(Sampler |self, buf, area| {
     let Rect { x, y, height, .. } = area;
     let style = Style::default().gray();
-    let title = format!(" {} ({})", self.name, self.voices.len());
+    let title = format!(" {} ({})", self.name, self.voices.read().unwrap().len());
     title.blit(buf, x+1, y, Some(style.white().bold().not_dim()))?;
     let mut width = title.len() + 2;
     let mut y1 = 1;
@@ -63,7 +63,7 @@ handle!(Sampler |self, event| handle_keymap(self, event, KEYMAP_SAMPLER));
 
 /// Key bindings for sampler device.
 pub const KEYMAP_SAMPLER: &'static [KeyBinding<Sampler>] = keymap!(Sampler {
-    [Up, NONE, "cursor_up", "move cursor up", |state: &mut Sampler| {
+    [Up, NONE, "/sampler/cursor/up", "move cursor up", |state: &mut Sampler| {
         state.cursor.0 = if state.cursor.0 == 0 {
             state.mapped.len() + state.unmapped.len() - 1
         } else {
@@ -71,29 +71,29 @@ pub const KEYMAP_SAMPLER: &'static [KeyBinding<Sampler>] = keymap!(Sampler {
         };
         Ok(true)
     }],
-    [Down, NONE, "cursor_down", "move cursor down", |state: &mut Sampler| {
+    [Down, NONE, "/sampler/cursor/down", "move cursor down", |state: &mut Sampler| {
         state.cursor.0 = (state.cursor.0 + 1) % (state.mapped.len() + state.unmapped.len());
         Ok(true)
     }],
-    [Char('t'), NONE, "sample_play", "play current sample",  |state: &mut Sampler| {
+    [Char('t'), NONE, "/sampler/play", "play current sample",  |state: &mut Sampler| {
         if let Some(sample) = state.sample() {
-            state.voices.push(Sample::play(sample, 0, &100.into()))
+            state.voices.write().unwrap().push(Sample::play(sample, 0, &100.into()));
         }
         Ok(true)
     }],
-    [Char('a'), NONE, "sample_add", "add a new sample", |state: &mut Sampler| {
-        let sample = Sample::new("", 0, 0, vec![]);
-        *MODAL.lock().unwrap() = Some(Exit::boxed(AddSampleModal::new(&sample)?));
+    [Char('a'), NONE, "/sampler/add", "add a new sample", |state: &mut Sampler| {
+        let sample = Arc::new(RwLock::new(Sample::new("", 0, 0, vec![])));
+        *MODAL.lock().unwrap() = Some(Exit::boxed(AddSampleModal::new(&sample, &state.voices)?));
         state.unmapped.push(sample);
         Ok(true)
     }],
-    [Char('r'), NONE, "sample_replace", "replace selected sample", |state: &mut Sampler| {
+    [Char('r'), NONE, "/sampler/replace", "replace selected sample", |state: &mut Sampler| {
         if let Some(sample) = state.sample() {
-            *MODAL.lock().unwrap() = Some(Exit::boxed(AddSampleModal::new(&sample)?));
+            *MODAL.lock().unwrap() = Some(Exit::boxed(AddSampleModal::new(&sample, &state.voices)?));
         }
         Ok(true)
     }],
-    [Enter, NONE, "sample_edit", "edit selected sample", |state: &mut Sampler| {
+    [Enter, NONE, "/sampler/edit", "edit selected sample", |state: &mut Sampler| {
         if let Some(sample) = state.sample() {
             state.editing = Some(sample.clone());
         }
@@ -117,7 +117,7 @@ impl Sampler {
                 editing:  None,
                 mapped:   mapped.unwrap_or_else(||BTreeMap::new()),
                 unmapped: vec![],
-                voices:   vec![],
+                voices:   Arc::new(RwLock::new(vec![])),
                 ports,
                 buffer:   vec![vec![0.0;16384];2],
                 output_gain: 0.5,
@@ -153,7 +153,7 @@ impl Sampler {
             if let LiveEvent::Midi { message, .. } = LiveEvent::parse(bytes).unwrap() {
                 if let MidiMessage::NoteOn { ref key, ref vel } = message {
                     if let Some(sample) = self.mapped.get(key) {
-                        self.voices.push(Sample::play(sample, time as usize, vel));
+                        self.voices.write().unwrap().push(Sample::play(sample, time as usize, vel));
                     }
                 }
             }
@@ -170,7 +170,7 @@ impl Sampler {
     /// Mix all currently playing samples into the output.
     fn process_audio_out (&mut self, scope: &ProcessScope) {
         let channel_count = self.buffer.len();
-        self.voices.retain_mut(|voice|{
+        self.voices.write().unwrap().retain_mut(|voice|{
             for index in 0..scope.n_frames() as usize {
                 if let Some(frame) = voice.next() {
                     for (channel, sample) in frame.iter().enumerate() {
diff --git a/src/devices/sampler/add_sample.rs b/src/devices/sampler/add_sample.rs
index 24704f13..b05aef58 100644
--- a/src/devices/sampler/add_sample.rs
+++ b/src/devices/sampler/add_sample.rs
@@ -17,6 +17,7 @@ pub struct AddSampleModal {
     cursor:  usize,
     offset:  usize,
     sample:  Arc<RwLock<Sample>>,
+    voices:  Arc<RwLock<Vec<Voice>>>,
     _search: Option<String>,
 }
 
@@ -65,7 +66,10 @@ handle!(AddSampleModal |self,e|{
 });
 
 impl AddSampleModal {
-    pub fn new (sample: &Arc<RwLock<Sample>>) -> Usually<Self> {
+    pub fn new (
+        sample: &Arc<RwLock<Sample>>,
+        voices: &Arc<RwLock<Vec<Voice>>>
+    ) -> Usually<Self> {
         let dir = std::env::current_dir()?;
         let (subdirs, files) = scan(&dir)?;
         Ok(Self {
@@ -76,6 +80,7 @@ impl AddSampleModal {
             cursor: 0,
             offset: 0,
             sample: sample.clone(),
+            voices: voices.clone(),
             _search: None
         })
     } 
@@ -93,6 +98,12 @@ impl AddSampleModal {
     }
     fn try_preview (&mut self) -> Usually<()> {
         if let Some(path) = self.cursor_file() {
+            if let Ok(sample) = Sample::from_file(&path) {
+                *self.sample.write().unwrap() = sample;
+                self.voices.write().unwrap().push(
+                    Sample::play(&self.sample, 0, &u7::from(100u8))
+                );
+            }
             //load_sample(&path)?;
             //let src = std::fs::File::open(&path)?;
             //let mss = MediaSourceStream::new(Box::new(src), Default::default());
@@ -198,9 +209,9 @@ fn scan (dir: &PathBuf) -> Usually<(Vec<OsString>, Vec<OsString>)> {
 }
 
 impl Sample {
-    fn from_file (path: &PathBuf) -> Usually<Arc<RwLock<Self>>> {
+    fn from_file (path: &PathBuf) -> Usually<Self> {
         let mut sample = Self::default();
-        sample.name = path.to_string_lossy().into();
+        sample.name = path.file_name().unwrap().to_string_lossy().into();
         // Use file extension if present
         let mut hint = Hint::new();
         if let Some(ext) = path.extension() {
@@ -256,6 +267,7 @@ impl Sample {
                 Err(err) => return Err(err.into()),
             };
         };
-        Ok(Arc::new(RwLock::new(sample)))
+        sample.end = sample.channels.iter().fold(0, |l, c|l + c.len());
+        Ok(sample)
     }
 }
diff --git a/src/devices/sampler/sample.rs b/src/devices/sampler/sample.rs
index 4116d869..5b17d93c 100644
--- a/src/devices/sampler/sample.rs
+++ b/src/devices/sampler/sample.rs
@@ -2,7 +2,7 @@ use crate::core::*;
 use super::*;
 
 /// A sound sample.
-#[derive(Default)]
+#[derive(Default, Debug)]
 pub struct Sample {
     pub name:     String,
     pub start:    usize,
@@ -12,10 +12,8 @@ pub struct Sample {
 }
 
 impl Sample {
-    pub fn new (
-        name: &str, start: usize, end: usize, channels: Vec<Vec<f32>>
-    ) -> Arc<RwLock<Self>> {
-        Arc::new(RwLock::new(Self { name: name.to_string(), start, end, channels, rate: None }))
+    pub fn new (name: &str, start: usize, end: usize, channels: Vec<Vec<f32>>) -> Self {
+        Self { name: name.to_string(), start, end, channels, rate: None }
     }
     pub fn play (sample: &Arc<RwLock<Self>>, after: usize, velocity: &u7) -> Voice {
         Voice {
diff --git a/src/edn.rs b/src/edn.rs
index 10200ed1..887159ad 100644
--- a/src/edn.rs
+++ b/src/edn.rs
@@ -295,7 +295,7 @@ impl Sample {
             _ => panic!("unexpected in sample {name}"),
         });
         let (end, data) = read_sample_data(&format!("{dir}/{file}"))?;
-        Ok((midi, Self::new(&name, start, end, data)))
+        Ok((midi, Arc::new(RwLock::new(Self::new(&name, start, end, data)))))
     }
 }