diff --git a/crates/app/src/api.rs b/crates/app/src/api.rs
index 72edce2a..b217633a 100644
--- a/crates/app/src/api.rs
+++ b/crates/app/src/api.rs
@@ -15,6 +15,8 @@ view!(TuiOut: |self: Tek| self.size.of(View(self, self.view)); {
         ().boxed(),//self.view_sample(self.is_editing()).boxed(),
     ":sampler" =>
         ().boxed(),//self.view_sampler(self.is_editing(), &self.editor).boxed(),
+    ":samples-grid" =>
+        self.tracks[0].sampler(0).map(|s|s.view_grid()).boxed(),
     ":status" =>
         self.view_status().boxed(),
     ":pool" => self.pool.as_ref()
diff --git a/crates/app/src/device.rs b/crates/app/src/device.rs
index c9db7a79..c7b7e813 100644
--- a/crates/app/src/device.rs
+++ b/crates/app/src/device.rs
@@ -1,10 +1 @@
 use crate::*;
-
-pub trait Device: Send + Sync + std::fmt::Debug {
-    fn boxed <'a> (self) -> Box<dyn Device + 'a> where Self: Sized + 'a { Box::new(self) }
-}
-
-impl Device for Sampler {}
-
-#[cfg(feature = "host")]
-impl Device for Plugin {}
diff --git a/crates/app/src/model.rs b/crates/app/src/model.rs
index 6ba1add7..fa0030b0 100644
--- a/crates/app/src/model.rs
+++ b/crates/app/src/model.rs
@@ -247,60 +247,6 @@ impl HasSelection for Tek {
     fn selected_mut (&mut self) -> &mut Selection { &mut self.selected }
 }
 
-pub trait HasTracks: HasSelection + HasClock + HasJack + HasEditor + Send + Sync {
-    fn midi_ins (&self) -> &Vec<JackMidiIn>;
-    fn midi_outs (&self) -> &Vec<JackMidiOut>;
-    fn tracks (&self) -> &Vec<Track>;
-    fn tracks_mut (&mut self) -> &mut Vec<Track>;
-    fn track_longest (&self) -> usize {
-        self.tracks().iter().map(|s|s.name.len()).fold(0, usize::max)
-    }
-    const WIDTH_OFFSET: usize = 1;
-    fn track_next_name (&self) -> Arc<str> {
-        format!("Track{:02}", self.tracks().len() + 1).into()
-    }
-    fn track (&self) -> Option<&Track> {
-        self.selected().track().and_then(|s|self.tracks().get(s))
-    }
-    fn track_mut (&mut self) -> Option<&mut Track> {
-        self.selected().track().and_then(|s|self.tracks_mut().get_mut(s))
-    }
-}
-
-#[derive(Debug, Default)] pub struct Track {
-    /// Name of track
-    pub name: Arc<str>,
-    /// Preferred width of track column
-    pub width: usize,
-    /// Identifying color of track
-    pub color: ItemPalette,
-    /// MIDI player state
-    pub player: MidiPlayer,
-    /// Device chain
-    pub devices: Vec<Box<dyn Device>>,
-    /// Inputs of 1st device
-    pub audio_ins:  Vec<JackAudioIn>,
-    /// Outputs of last device
-    pub audio_outs: Vec<JackAudioOut>,
-}
-
-has_clock!(|self: Track|self.player.clock);
-
-has_player!(|self: Track|self.player);
-
-impl Track {
-    const MIN_WIDTH: usize = 9;
-    fn width_inc (&mut self) { self.width += 1; }
-    fn width_dec (&mut self) { if self.width > Track::MIN_WIDTH { self.width -= 1; } }
-}
-
-impl HasTracks for Tek {
-    fn midi_ins (&self) -> &Vec<JackMidiIn> { &self.midi_ins }
-    fn midi_outs (&self) -> &Vec<JackMidiOut> { &self.midi_outs }
-    fn tracks (&self) -> &Vec<Track> { &self.tracks }
-    fn tracks_mut (&mut self) -> &mut Vec<Track> { &mut self.tracks }
-}
-
 pub trait HasScenes: HasSelection + HasEditor + Send + Sync {
     fn scenes (&self) -> &Vec<Scene>;
     fn scenes_mut (&mut self) -> &mut Vec<Scene>;
@@ -361,3 +307,97 @@ impl HasScenes for Tek {
     fn scenes (&self) -> &Vec<Scene> { &self.scenes }
     fn scenes_mut (&mut self) -> &mut Vec<Scene> { &mut self.scenes }
 }
+
+pub trait HasTracks: HasSelection + HasClock + HasJack + HasEditor + Send + Sync {
+    fn midi_ins (&self) -> &Vec<JackMidiIn>;
+    fn midi_outs (&self) -> &Vec<JackMidiOut>;
+    fn tracks (&self) -> &Vec<Track>;
+    fn tracks_mut (&mut self) -> &mut Vec<Track>;
+    fn track_longest (&self) -> usize {
+        self.tracks().iter().map(|s|s.name.len()).fold(0, usize::max)
+    }
+    const WIDTH_OFFSET: usize = 1;
+    fn track_next_name (&self) -> Arc<str> {
+        format!("Track{:02}", self.tracks().len() + 1).into()
+    }
+    fn track (&self) -> Option<&Track> {
+        self.selected().track().and_then(|s|self.tracks().get(s))
+    }
+    fn track_mut (&mut self) -> Option<&mut Track> {
+        self.selected().track().and_then(|s|self.tracks_mut().get_mut(s))
+    }
+}
+
+#[derive(Debug, Default)] pub struct Track {
+    /// Name of track
+    pub name:       Arc<str>,
+    /// Preferred width of track column
+    pub width:      usize,
+    /// Identifying color of track
+    pub color:      ItemPalette,
+    /// MIDI player state
+    pub player:     MidiPlayer,
+    /// Device chain
+    pub devices:    Vec<Device>,
+    /// Inputs of 1st device
+    pub audio_ins:  Vec<JackAudioIn>,
+    /// Outputs of last device
+    pub audio_outs: Vec<JackAudioOut>,
+}
+
+has_clock!(|self: Track|self.player.clock);
+
+has_player!(|self: Track|self.player);
+
+impl Track {
+    pub const MIN_WIDTH: usize = 9;
+    pub fn width_inc (&mut self) {
+        self.width += 1;
+    }
+    pub fn width_dec (&mut self) {
+        if self.width > Track::MIN_WIDTH {
+            self.width -= 1;
+        }
+    }
+    pub fn sequencer (&self, mut nth: usize) -> Option<&MidiPlayer> {
+        for device in self.devices.iter() {
+            match device {
+                Device::Sequencer(s) => if nth == 0 {
+                    return Some(s);
+                } else {
+                    nth -= 1;
+                },
+                _ => {}
+            }
+        }
+        None
+    }
+    pub fn sampler (&self, mut nth: usize) -> Option<&Sampler> {
+        for device in self.devices.iter() {
+            match device {
+                Device::Sampler(s) => if nth == 0 {
+                    return Some(s);
+                } else {
+                    nth -= 1;
+                },
+                _ => {}
+            }
+        }
+        None
+    }
+}
+
+impl HasTracks for Tek {
+    fn midi_ins (&self) -> &Vec<JackMidiIn> { &self.midi_ins }
+    fn midi_outs (&self) -> &Vec<JackMidiOut> { &self.midi_outs }
+    fn tracks (&self) -> &Vec<Track> { &self.tracks }
+    fn tracks_mut (&mut self) -> &mut Vec<Track> { &mut self.tracks }
+}
+
+#[derive(Debug)]
+pub enum Device {
+    Sequencer(MidiPlayer),
+    Sampler(Sampler),
+    #[cfg(feature="host")]
+    Plugin(Plugin),
+}
diff --git a/crates/cli/Cargo.toml b/crates/cli/Cargo.toml
index b040d826..765cd93f 100644
--- a/crates/cli/Cargo.toml
+++ b/crates/cli/Cargo.toml
@@ -4,7 +4,7 @@ edition = { workspace = true }
 version = { workspace = true }
 
 [dependencies]
-tek = { workspace = true }
+tek  = { workspace = true }
 clap = { workspace = true }
 
 [[bin]]
diff --git a/crates/cli/tek.rs b/crates/cli/tek.rs
index 3e2a3524..465959f2 100644
--- a/crates/cli/tek.rs
+++ b/crates/cli/tek.rs
@@ -128,19 +128,51 @@ impl Cli {
                 keys_scene: SourceIter(include_str!("./edn/arranger_keys_scene.edn")),
                 keys_mix:   SourceIter(include_str!("./edn/arranger_keys_mix.edn")),
                 tracks: match mode {
-                    Mode::Sequencer => vec![Track::default()],
-                    Mode::Groovebox | Mode::Sampler => vec![Track {
-                        devices: vec![
-                            Device::boxed(Sampler::new(
-                                jack,
-                                &"sampler",
-                                midi_froms.as_slice(),
-                                audio_froms,
-                                audio_tos
-                            )?)
-                        ],
-                        ..Track::default()
-                    }],
+
+                    Mode::Sequencer => vec![
+                        Track {
+                            devices: vec![
+                                Device::Sequencer(
+                                    MidiPlayer::default()
+                                ),
+                            ],
+                            ..Track::default()
+                        },
+                    ],
+
+                    Mode::Groovebox => vec![
+                        Track {
+                            devices: vec![
+                                Device::Sequencer(
+                                    MidiPlayer::default()
+                                ),
+                                Device::Sampler(Sampler::new(
+                                    jack,
+                                    &"sampler",
+                                    midi_froms.as_slice(),
+                                    audio_froms,
+                                    audio_tos
+                                )?)
+                            ],
+                            ..Track::default()
+                        }
+                    ],
+
+                    Mode::Sampler => vec![
+                        Track {
+                            devices: vec![
+                                Device::Sampler(Sampler::new(
+                                    jack,
+                                    &"sampler",
+                                    midi_froms.as_slice(),
+                                    audio_froms,
+                                    audio_tos
+                                )?)
+                            ],
+                            ..Track::default()
+                        }
+                    ],
+
                     _ => vec![]
                 },
                 scenes,
diff --git a/crates/midi/src/midi_out.rs b/crates/midi/src/midi_out.rs
index 913832de..1cdee9cb 100644
--- a/crates/midi/src/midi_out.rs
+++ b/crates/midi/src/midi_out.rs
@@ -20,7 +20,8 @@ pub trait MidiPlaybackApi: HasPlayClip + HasClock + HasMidiOuts {
     fn clear (
         &mut self, scope: &ProcessScope, out: &mut [Vec<Vec<u8>>], reset: bool
     ) {
-        for frame in &mut out[0..scope.n_frames() as usize] {
+        let n_frames = (scope.n_frames() as usize).min(out.len());
+        for frame in &mut out[0..n_frames] {
             frame.clear();
         }
         if reset {
diff --git a/crates/sampler/src/sampler_api.rs b/crates/sampler/src/sampler_api.rs
index e1451cc1..e60b262e 100644
--- a/crates/sampler/src/sampler_api.rs
+++ b/crates/sampler/src/sampler_api.rs
@@ -6,20 +6,6 @@ provide!(f32: |self: Sampler| {});
 provide!(u7: |self: Sampler| {});
 provide!(usize: |self: Sampler| {});
 
-//handle!(TuiIn: |self: Sampler, input|SamplerCommand::execute_with_state(self, input.event()));
-//input_to_command!(SamplerCommand: |state: Sampler, input: Event|match state.mode{
-    //Some(SamplerMode::Import(..)) => Self::Import(
-        //FileBrowserCommand::input_to_command(state, input)?
-    //),
-    //_ => match input {
-        //// load sample
-        //kpat!(Shift-Char('L')) => Self::Import(FileBrowserCommand::Begin),
-        //kpat!(KeyCode::Up)     => Self::Select(state.note_pos().overflowing_add(1).0.min(127)),
-        //kpat!(KeyCode::Down)   => Self::Select(state.note_pos().overflowing_sub(1).0.min(127)),
-        //_ => return None
-    //}
-//});
-
 defcom! { |self, state: Sampler|
 
     SamplerCommand {
diff --git a/crates/sampler/src/sampler_view.rs b/crates/sampler/src/sampler_view.rs
index a39c7193..e1411007 100644
--- a/crates/sampler/src/sampler_view.rs
+++ b/crates/sampler/src/sampler_view.rs
@@ -1,5 +1,11 @@
 use crate::*;
 
+impl Sampler {
+    pub fn view_grid (&self) -> impl Content<TuiOut> {
+        "sampler grid view"
+    }
+}
+
 content!(TuiOut: |self: Sampler| {
     let keys_width  = 5;
     let keys        = move||"";//SamplerKeys(self);