diff --git a/src/midi_edit.rs b/src/midi_edit.rs
index 2703e8fc..bb08e820 100644
--- a/src/midi_edit.rs
+++ b/src/midi_edit.rs
@@ -1,13 +1,9 @@
 #![allow(unused)]
 use crate::*;
 
-pub trait HasEditor: AsRef<Option<MidiEditor>> + AsMut<Option<MidiEditor>> {
-    fn editor (&self) -> &Option<MidiEditor> {
-        self.as_ref()
-    }
-    fn editor_mut (&mut self) -> &mut Option<MidiEditor> {
-        self.as_mut()
-    }
+impl<T: HasEditor> EditorModel for T {}
+
+pub trait EditorModel: HasEditor {
     fn is_editing (&self) -> bool {
         self.editor().is_some()
     }
@@ -19,8 +15,6 @@ pub trait HasEditor: AsRef<Option<MidiEditor>> + AsMut<Option<MidiEditor>> {
     }
 }
 
-impl<T> HasEditor for T where T: AsRef<Option<MidiEditor>> + AsMut<Option<MidiEditor>> {}
-
 /// Contains state for viewing and editing a clip.
 ///
 /// ```
diff --git a/src/midi_mon.rs b/src/midi_mon.rs
index bbf7a4ec..0a5fbe83 100644
--- a/src/midi_mon.rs
+++ b/src/midi_mon.rs
@@ -1,10 +1,5 @@
 use crate::*;
 
-pub trait HasMidiBuffers {
-    fn note_buf_mut (&mut self) -> &mut Vec<u8>;
-    fn midi_buf_mut (&mut self) -> &mut Vec<Vec<Vec<u8>>>;
-}
-
 pub trait MidiMonitor: HasMidiIns + HasMidiBuffers {
     /// Input note flags.
     fn notes_in (&self) -> &Arc<RwLock<[bool;128]>>;
diff --git a/src/midi_play.rs b/src/midi_play.rs
index 8fcab188..f732ae51 100644
--- a/src/midi_play.rs
+++ b/src/midi_play.rs
@@ -1,12 +1,25 @@
 use crate::*;
 
-pub trait HasPlayClip: HasClock {
-    fn reset (&self) -> bool;
-    fn reset_mut (&mut self) -> &mut bool;
-    fn play_clip (&self) -> &Option<(Moment, Option<Arc<RwLock<MidiClip>>>)>;
-    fn play_clip_mut (&mut self) -> &mut Option<(Moment, Option<Arc<RwLock<MidiClip>>>)>;
-    fn next_clip (&self) -> &Option<(Moment, Option<Arc<RwLock<MidiClip>>>)>;
-    fn next_clip_mut (&mut self) -> &mut Option<(Moment, Option<Arc<RwLock<MidiClip>>>)>;
+#[cfg(feature="clip")] impl HasPlayClip for Sequencer {
+    fn reset (&self) -> bool { self.reset }
+    fn reset_mut (&mut self) -> &mut bool { &mut self.reset }
+    fn play_clip (&self) -> &Option<(Moment, Option<Arc<RwLock<MidiClip>>>)> {
+        &self.play_clip
+    }
+    fn play_clip_mut (&mut self) -> &mut Option<(Moment, Option<Arc<RwLock<MidiClip>>>)> {
+        &mut self.play_clip
+    }
+    fn next_clip (&self) -> &Option<(Moment, Option<Arc<RwLock<MidiClip>>>)> {
+        &self.next_clip
+    }
+    fn next_clip_mut (&mut self) -> &mut Option<(Moment, Option<Arc<RwLock<MidiClip>>>)> {
+        &mut self.next_clip
+    }
+}
+
+impl<T: HasPlayClip> PlaybackModel for T {}
+
+pub trait PlaybackModel: HasPlayClip {
 
     fn pulses_since_start (&self) -> Option<f64> {
         if let Some((started, Some(_))) = self.play_clip().as_ref() {
@@ -88,20 +101,3 @@ pub trait HasPlayClip: HasClock {
         field_v(color, "Next:", format!("{} {}", time, name))
     }
 }
-
-#[cfg(feature="clip")] impl HasPlayClip for Sequencer {
-    fn reset (&self) -> bool { self.reset }
-    fn reset_mut (&mut self) -> &mut bool { &mut self.reset }
-    fn play_clip (&self) -> &Option<(Moment, Option<Arc<RwLock<MidiClip>>>)> {
-        &self.play_clip
-    }
-    fn play_clip_mut (&mut self) -> &mut Option<(Moment, Option<Arc<RwLock<MidiClip>>>)> {
-        &mut self.play_clip
-    }
-    fn next_clip (&self) -> &Option<(Moment, Option<Arc<RwLock<MidiClip>>>)> {
-        &self.next_clip
-    }
-    fn next_clip_mut (&mut self) -> &mut Option<(Moment, Option<Arc<RwLock<MidiClip>>>)> {
-        &mut self.next_clip
-    }
-}
diff --git a/src/midi_seq.rs b/src/midi_seq.rs
index ddec83ce..e8da23f7 100644
--- a/src/midi_seq.rs
+++ b/src/midi_seq.rs
@@ -1,12 +1,5 @@
 use crate::*;
 
-impl <T: AsRef<Sequencer>+AsMut<Sequencer>> HasSequencer for T {}
-
-pub trait HasSequencer: AsRef<Sequencer> + AsMut<Sequencer> {
-    fn sequencer_mut (&mut self) -> &mut Sequencer { self.as_mut() }
-    fn sequencer     (&self)     -> &Sequencer     { self.as_ref() }
-}
-
 /// Contains state for playing a clip
 ///
 /// ```
diff --git a/src/proj.rs b/src/proj.rs
index 7417fbee..99bb095c 100644
--- a/src/proj.rs
+++ b/src/proj.rs
@@ -1,11 +1,10 @@
 use crate::*;
-pub trait HasProject: AsRef<Option<Project>> + AsMut<Option<Project>> {}
-impl<T: AsRef<Option<Project>> + AsMut<Option<Project>>> HasProject for T {}
 /// Arranger.
 ///
 /// ```
 /// let arranger = tek::Project::default();
 /// ```
+#[namespace(ClipPool ClipPool::eval)]
 #[derive(Default, Debug)] pub struct Project {
     /// JACK client handle.
     pub jack:       Jack<'static>,
@@ -204,6 +203,35 @@ impl ClipLength {
         self.pulses % self.ppq
     }
 }
+
+impl HasTrackScroll for &mut Project {
+    fn track_scroll (&self) -> usize {
+        self.track_scroll
+    }
+    fn tracks_last (&self) -> usize {
+        self.track_last
+    }
+    fn tracks_last_mut (&mut self) -> &mut usize {
+        &mut self.track_last
+    }
+}
+
+impl HasTrackScroll for Project {
+    fn track_scroll (&self) -> usize {
+        self.track_scroll
+    }
+    fn tracks_last (&self) -> usize {
+        self.track_last
+    }
+    fn tracks_last_mut (&mut self) -> &mut usize {
+        &mut self.track_last
+    }
+}
+
+impl HasSceneScroll for Project {
+    fn scene_scroll (&self) -> usize { self.scene_scroll }
+}
+
 //impl_from!(Pool<MidiClip>: |clip:&Arc<RwLock<MidiClip>>|{
     //let model = Self::default();
     //model.clips.try_write().unwrap().push(clip.clone());
diff --git a/src/proj_clock.rs b/src/proj_clock.rs
index 27a78bf1..56ea1c9e 100644
--- a/src/proj_clock.rs
+++ b/src/proj_clock.rs
@@ -46,17 +46,6 @@ impl App {
     #[cfg(feature = "port")] pub click_out: Arc<RwLock<Option<AudioOutput>>>,
 }
 
-impl<T: AsRef<Clock> + AsMut<Clock>> HasClock for T {}
-
-pub trait HasClock: AsRef<Clock> + AsMut<Clock> {
-    fn clock (&self) -> &Clock {
-        self.as_ref()
-    }
-    fn clock_mut (&mut self) -> &mut Clock {
-        self.as_mut()
-    }
-}
-
 //impl<T: HasClock> Act<T> for ClockCmd {
     //fn act (&self, state: &mut T) -> Perhaps<Self> {
         //self.act(state.clock_mut()) // awesome
diff --git a/src/proj_device.rs b/src/proj_device.rs
index 52aa013c..9f6153d9 100644
--- a/src/proj_device.rs
+++ b/src/proj_device.rs
@@ -189,12 +189,3 @@ impl<T: AsRef<Vec<Device>> + AsMut<Vec<Device>>> HasDevices for T {
         self.as_mut()
     }
 }
-
-pub trait HasDevices: AsRef<Vec<Device>> + AsMut<Vec<Device>> {
-    fn devices (&self) -> &Vec<Device> {
-        self.as_ref()
-    }
-    fn devices_mut (&mut self) -> &mut Vec<Device> {
-        self.as_mut()
-    }
-}
diff --git a/src/proj_scene.rs b/src/proj_scene.rs
index 06f65e74..e3a91663 100644
--- a/src/proj_scene.rs
+++ b/src/proj_scene.rs
@@ -48,17 +48,6 @@ impl Scene {
 }
 
 
-impl<T: AsRefOpt<Scene> + AsMutOpt<Scene> + Send + Sync> HasScene for T {}
-
-pub trait HasScene: AsRefOpt<Scene> + AsMutOpt<Scene> {
-    fn scene (&self) -> Option<&Scene> {
-        self.as_ref_opt()
-    }
-    fn scene_mut (&mut self) -> Option<&mut Scene> {
-        self.as_mut_opt()
-    }
-}
-
 pub type SceneWith<'a, T> = (usize, &'a Scene, usize, usize, T);
 
 def_sizes_iter!(ScenesSizes => Scene);
@@ -66,53 +55,3 @@ impl_as_ref!(Vec<Scene>: |self: App| self.project.as_ref());
 impl_as_mut!(Vec<Scene>: |self: App| self.project.as_mut());
 impl_as_ref_opt!(Scene:  |self: App| self.project.as_ref_opt());
 impl_as_mut_opt!(Scene:  |self: App| self.project.as_mut_opt());
-
-impl<T: AsRef<Vec<Scene>> + AsMut<Vec<Scene>>> HasScenes for T {}
-
-pub trait HasScenes: AsRef<Vec<Scene>> + AsMut<Vec<Scene>> {
-    fn scenes (&self) -> &Vec<Scene> {
-        self.as_ref()
-    }
-    fn scenes_mut (&mut self) -> &mut Vec<Scene> {
-        self.as_mut()
-    }
-    /// Generate the default name for a new scene
-    fn scenes_default_name (&self) -> Arc<str> {
-        format!("s{:3>}", self.scenes().len() + 1).into()
-    }
-    fn scenes_longest_name (&self) -> usize {
-        self.scenes().iter().map(|s|s.name.len()).fold(0, usize::max)
-    }
-    /// Add multiple scenes
-    fn scenes_add_many (&mut self, n: usize)
-        -> Usually<()> where Self: HasTracks
-    {
-        let scene_color_1 = ItemColor::random();
-        let scene_color_2 = ItemColor::random();
-        for i in 0..n {
-            let _ = self.scenes_add_one(None, Some(
-                scene_color_1.mix(scene_color_2, i as f32 / n as f32).into()
-            ))?;
-        }
-        Ok(())
-    }
-    /// Add a scene
-    fn scenes_add_one (&mut self, name: Option<Arc<str>>, color: Option<ItemTheme>)
-        -> Usually<(usize, &mut Scene)>
-    where
-        Self: HasTracks
-    {
-        let scene = Scene {
-            name: name.map_or_else(||self.scenes_default_name(), |x|x.to_string().into()),
-            clips: Pool::from(vec![None;self.tracks().len()]),
-            color: color.unwrap_or_else(ItemTheme::random),
-        };
-        self.scenes_mut().push(scene);
-        let index = self.scenes().len() - 1;
-        Ok((index, &mut self.scenes_mut()[index]))
-    }
-}
-
-pub trait HasSceneScroll: HasScenes { fn scene_scroll (&self) -> usize; }
-impl HasSceneScroll for Project { fn scene_scroll (&self) -> usize { self.scene_scroll } }
-impl HasSceneScroll for App { fn scene_scroll (&self) -> usize { self.project.scene_scroll() } }
diff --git a/src/proj_select.rs b/src/proj_select.rs
index 632babc7..4098f30f 100644
--- a/src/proj_select.rs
+++ b/src/proj_select.rs
@@ -4,40 +4,6 @@ impl_as_ref_opt!(Track: |self: Project| self.selected_track());
 impl_as_mut_opt!(Track: |self: Project| self.selected_track_mut());
 impl_as_ref_opt!(Track: |self: App| self.project.as_ref_opt());
 impl_as_mut_opt!(Track: |self: App| self.project.as_mut_opt());
-impl <T: AsRef<Selection>+AsMut<Selection>> HasSelection for T {}
-
-pub trait HasSelection: AsRef<Selection> + AsMut<Selection> {
-    fn selection (&self) -> &Selection {
-        self.as_ref()
-    }
-    fn selection_mut (&mut self) -> &mut Selection {
-        self.as_mut()
-    }
-    /// Get the active track
-    #[cfg(feature = "track")] fn selected_track (&self) -> Option<&Track> where Self: HasTracks {
-        let index = self.selection().track()?;
-        self.tracks().get(index)
-    }
-    /// Get a mutable reference to the active track
-    #[cfg(feature = "track")] fn selected_track_mut (&mut self) -> Option<&mut Track> where Self: HasTracks {
-        let index = self.selection().track()?;
-        self.tracks_mut().get_mut(index)
-    }
-    /// Get the active scene
-    #[cfg(feature = "scene")] fn selected_scene (&self) -> Option<&Scene> where Self: HasScenes {
-        let index = self.selection().scene()?;
-        self.scenes().get(index)
-    }
-    /// Get a mutable reference to the active scene
-    #[cfg(feature = "scene")] fn selected_scene_mut (&mut self) -> Option<&mut Scene> where Self: HasScenes {
-        let index = self.selection().scene()?;
-        self.scenes_mut().get_mut(index)
-    }
-    /// Get the active clip
-    #[cfg(feature = "clip")] fn selected_clip (&self) -> Option<Slot<MidiClip>> where Self: HasScenes + HasTracks {
-        self.selected_scene()?.clips.read().get(self.selection().track()?).cloned()
-    }
-}
 
 /// Represents the current user selection in the arranger
 #[derive(PartialEq, Clone, Copy, Debug, Default)]
@@ -188,3 +154,32 @@ impl Selection {
     }
 
 }
+
+impl<T: HasSelection> SelectionModel for T {}
+
+pub trait SelectionModel: HasSelection {
+    /// Get the active track
+    #[cfg(feature = "track")] fn selected_track (&self) -> Option<&Track> where Self: HasTracks {
+        let index = self.selection().track()?;
+        self.tracks().get(index)
+    }
+    /// Get a mutable reference to the active track
+    #[cfg(feature = "track")] fn selected_track_mut (&mut self) -> Option<&mut Track> where Self: HasTracks {
+        let index = self.selection().track()?;
+        self.tracks_mut().get_mut(index)
+    }
+    /// Get the active scene
+    #[cfg(feature = "scene")] fn selected_scene (&self) -> Option<&Scene> where Self: HasScenes {
+        let index = self.selection().scene()?;
+        self.scenes().get(index)
+    }
+    /// Get a mutable reference to the active scene
+    #[cfg(feature = "scene")] fn selected_scene_mut (&mut self) -> Option<&mut Scene> where Self: HasScenes {
+        let index = self.selection().scene()?;
+        self.scenes_mut().get_mut(index)
+    }
+    /// Get the active clip
+    #[cfg(feature = "clip")] fn selected_clip (&self) -> Option<Slot<MidiClip>> where Self: HasScenes + HasTracks {
+        self.selected_scene()?.clips.read().get(self.selection().track()?).cloned()
+    }
+}
diff --git a/src/proj_track.rs b/src/proj_track.rs
index d66d8e52..5573c7fe 100644
--- a/src/proj_track.rs
+++ b/src/proj_track.rs
@@ -80,148 +80,8 @@ impl HasWidth for Track {
     }
 }
 
-impl<T: AsRefOpt<Track> + AsMutOpt<Track>> HasTrack for T {}
-
-pub trait HasTrack: AsRefOpt<Track> + AsMutOpt<Track> {
-    fn track (&self) -> Option<&Track> {
-        self.as_ref_opt()
-    }
-    fn track_mut (&mut self) -> Option<&mut Track> {
-        self.as_mut_opt()
-    }
-}
-
 def_sizes_iter!(TracksSizes => Track);
 impl_has!(Vec<Track>: |self: Project| self.tracks);
 impl_as_ref!(Vec<Track>: |self: App| self.project.as_ref());
 impl_as_mut!(Vec<Track>: |self: App| self.project.as_mut());
 impl_has!(Sequencer: |self: Track| self.sequencer);
-
-impl<T: AsRef<Vec<Track>> + AsMut<Vec<Track>> + HasClock + HasTrackScroll> HasTracks for T {}
-
-pub trait HasTracks: AsRef<Vec<Track>> + AsMut<Vec<Track>> + HasClock + HasTrackScroll {
-    /// Spacing between tracks.
-    const TRACK_SPACING: usize = 0;
-
-    /// Read-only reference to collection of [Track]s.
-    fn tracks (&self) -> &Vec<Track> {
-        self.as_ref()
-    }
-
-    /// Mutable reference to collection of [Track]s.
-    fn tracks_mut (&mut self) -> &mut Vec<Track> {
-        self.as_mut()
-    }
-
-    /// Run audio callbacks for every track and every device
-    fn tracks_jack_process (&mut self, client: &Client, scope: &ProcessScope) -> Control
-        where Self: HasJack<'static>
-    {
-        for track in self.tracks_mut().iter_mut() {
-            if Control::Quit == Audio::process(&mut track.sequencer, client, scope) {
-                return Control::Quit
-            }
-            for device in track.devices.iter_mut() {
-                if Control::Quit == DeviceAudio(device).process(client, scope) {
-                    return Control::Quit
-                }
-            }
-        }
-        Control::Continue
-    }
-
-    /// Add multiple tracks
-    fn tracks_add_many (
-        &mut self,
-        count: usize,
-        width: Option<usize>,
-        mins:  Arc<[Connect]>,
-        mouts: Arc<[Connect]>,
-    ) -> Usually<()>
-        where Self: HasJack<'static> + HasScenes
-    {
-        let track_color_1 = ItemColor::random();
-        let track_color_2 = ItemColor::random();
-        for i in 0..count {
-            let color = track_color_1.mix(track_color_2, i as f32 / count as f32).into();
-            let track = self.tracks_add_one(None, Some(color), mins.clone(), mouts.clone())?.1;
-            if let Some(width) = width {
-                track.width = width;
-            }
-        }
-        Ok(())
-    }
-
-    /// Add a track
-    fn tracks_add_one (
-        &mut self,
-        name:  Option<Arc<str>>,
-        color: Option<ItemTheme>,
-        mins:  Arc<[Connect]>,
-        mouts: Arc<[Connect]>,
-    ) -> Usually<(usize, &mut Track)>
-        where Self: HasJack<'static> + HasScenes
-    {
-        let name: Arc<str> = name.map_or_else(
-            ||format!("trk{}", self.tracks_last()).into(),
-            |x|x.to_string().into()
-        );
-        *self.tracks_last_mut() += 1;
-        let track = Track::new_added(self.jack(), Some(self.clock()), &name, color, None, mins, mouts)?;
-        self.tracks_mut().push(track);
-        let len = self.tracks().len();
-        let index = len - 1;
-        for scene in self.scenes_mut().iter_mut() {
-            while scene.clips.len() < len {
-                scene.clips.append(None);
-            }
-        }
-        Ok((index, &mut self.tracks_mut()[index]))
-    }
-
-    fn track_longest_name (&self) -> usize {
-        self.tracks().iter().map(|s|s.name.len()).fold(0, usize::max)
-    }
-}
-
-pub trait HasTrackScroll {
-    fn track_scroll (&self) -> usize;
-    fn tracks_last (&self) -> usize;
-    fn tracks_last_mut (&mut self) -> &mut usize;
-}
-
-impl HasTrackScroll for &mut Project {
-    fn track_scroll (&self) -> usize {
-        self.track_scroll
-    }
-    fn tracks_last (&self) -> usize {
-        self.track_last
-    }
-    fn tracks_last_mut (&mut self) -> &mut usize {
-        &mut self.track_last
-    }
-}
-
-impl HasTrackScroll for Project {
-    fn track_scroll (&self) -> usize {
-        self.track_scroll
-    }
-    fn tracks_last (&self) -> usize {
-        self.track_last
-    }
-    fn tracks_last_mut (&mut self) -> &mut usize {
-        &mut self.track_last
-    }
-}
-
-impl HasTrackScroll for App {
-    fn track_scroll (&self) -> usize {
-        self.project.track_scroll()
-    }
-    fn tracks_last (&self) -> usize {
-        self.project.track_last
-    }
-    fn tracks_last_mut (&mut self) -> &mut usize {
-        &mut self.project.track_last
-    }
-}
diff --git a/src/smpl.rs b/src/smpl.rs
index 5337ec7c..d5e69c50 100644
--- a/src/smpl.rs
+++ b/src/smpl.rs
@@ -58,15 +58,6 @@ pub(crate) use symphonia::{
     #[cfg(feature = "meter")] pub output_meters: Vec<f32>,
 }
 
-pub trait HasSampler: AsRef<Sampler> + AsMut<Sampler> {
-    fn sampler (&self) -> &Sampler {
-        self.as_ref()
-    }
-    fn sampler_mut (&mut self) -> &mut Sampler {
-        self.as_mut()
-    }
-}
-
 impl<T: AsRef<Sampler> + AsMut<Sampler>> HasSampler for T {}
 
 impl_audio!(Sampler: sampler_jack_process);
diff --git a/src/tek.edn b/src/tek.edn
index 48bec674..3fd26f6f 100644
--- a/src/tek.edn
+++ b/src/tek.edn
@@ -1,5 +1,5 @@
 (mode Menu (name Main Menu) (info Welcome to Tek!) (keys Y Confirm)
-  (view (bar/s 2 Transport (bar/n 2 StatusBar (align/c (bar/s 2 (align/x (bg (g 12) Logo)) Menu))))))
+  (view (bar/s 2 Transport (bar/n 2 StatusBar (align/c (bar/s 2 (align/x Logo) Menu))))))
 (mode Transport (name Transport) (info JACK transport controller.)
   (keys Clock Global)
   (view Transport))
@@ -24,7 +24,7 @@
   (keys Global Clock Sampler I IFine Y Page EditorView EditorAdd EditorDel)
   (view (bsp/w MetersOut (bsp/e MetersIn (bsp/w GrooveMeta GrooveEditor)))))
 
-(view Logo           (text tek! 0.4.0 ))
+(view Logo           (bg (g 255) (pad/xy 1 0 (bg (g 0) (fg (g 255) (text tek! 0.4.0 ))))))
 (view Browse         (bsp/s (pad/xy 3 1 BrowseTitle) (fg (g 96) browser)))
 (view PortsOut       (bsp/s (align/w (text L-AUDIO-OUT)) (bsp/e (text MIDI-OUT) (align/e (text AUDIO-OUT-R)))))
 (view PortsIn        (bsp/s (align/w (text L-AUDIO-IN)) (bsp/e (text MIDI-IN) (align/e (text AUDIO-IN-R)))))
@@ -36,13 +36,14 @@
                                (bg (g 20) (full/x (pad/x 1 (bar/s 1 (text Mode) ModeList))))))
 (view Transport      (bg (g 0) (pad/x 1 (bar/e 4 PlayPause (bar/e 16 Bpm (bar/e 16 Beat Time))))))
 
-(keys Global (@f1 (dialog Help))
-             (@f2 (project new))
-             (@f3 (dialog History))
-             (@f6 (dialog :save))
-             (@f8 (dialog :options))
-             (@f9 (dialog :load))
-             (@f10 (dialog :quit)))
+(keys Global (@f1  (enter Help))
+             (@f2  (project new))
+             (@f3  (enter History))
+             (@f6  (enter Save))
+             (@f8  (enter Options))
+             (@f9  (enter Load))
+             (@f10 (enter Quit))
+             (@f12 (enter Devtools)))
 
 (keys Back    (@escape cancel))
 (keys Confirm (@enter  confirm))
diff --git a/src/tek.rs b/src/tek.rs
index 90ce4736..0bdb0ad1 100644
--- a/src/tek.rs
+++ b/src/tek.rs
@@ -45,6 +45,7 @@ mod tek_bind; pub use self::tek_bind::*;
 mod tek_cli;  pub use self::tek_cli::*;
 mod tek_conf; pub use self::tek_conf::*;
 mod tek_ctrl; pub use self::tek_ctrl::*;
+mod tek_has;  pub use self::tek_has::*;
 mod tek_mode; pub use self::tek_mode::*;
 mod tek_pool; pub use self::tek_pool::*;
 mod tek_view; pub use self::tek_view::*;
@@ -461,14 +462,6 @@ impl ControlAxis {
     }
 }
 
-pub trait HasWidth {
-    const MIN_WIDTH: usize;
-    /// Increment track width.
-    fn width_inc (&mut self);
-    /// Decrement track width, down to a hardcoded minimum of [Self::MIN_WIDTH].
-    fn width_dec (&mut self);
-}
-
 /// Various possible dialog modes.
 ///
 /// ```
@@ -538,7 +531,7 @@ impl Dialog {
 
             MenuItem::new(" Create session ", [
                 AppCmd::Dialog   { dialog: Dialog::None },
-                AppCmd::Mode     { command: ModeCmd::Reset { modes: vec!["Arranger".into()] } },
+                AppCmd::Mode     { modes: vec!["Arranger".into()] },
                 AppCmd::Tracks   { command: TracksCmd::Add },
                 AppCmd::Scenes   { command: ScenesCmd::Add },
                 AppCmd::MidiClip { command: MidiClipCmd::Upsert },
@@ -790,3 +783,19 @@ impl App {
         if let Dialog::Browse(_, ref b) = self.dialog { Some(b) } else { None }
     }
 }
+
+impl HasTrackScroll for App {
+    fn track_scroll (&self) -> usize {
+        self.project.track_scroll()
+    }
+    fn tracks_last (&self) -> usize {
+        self.project.track_last
+    }
+    fn tracks_last_mut (&mut self) -> &mut usize {
+        &mut self.project.track_last
+    }
+}
+
+impl HasSceneScroll for App {
+    fn scene_scroll (&self) -> usize { self.project.scene_scroll() }
+}
diff --git a/src/tek_ctrl.rs b/src/tek_ctrl.rs
index 6618d7cf..799f2a56 100644
--- a/src/tek_ctrl.rs
+++ b/src/tek_ctrl.rs
@@ -4,8 +4,6 @@ impl_from!(AppCmd: |x: AxisCmd|     AppCmd::Axis     { command: x });
 impl_from!(AppCmd: |x: BrowseCmd|   AppCmd::Browse   { command: x });
 impl_from!(AppCmd: |x: MidiClipCmd| AppCmd::MidiClip { command: x });
 impl_from!(AppCmd: |x: MidiEditCmd| AppCmd::MidiEdit { command: x });
-impl_from!(AppCmd: |x: ModeCmd|     AppCmd::Mode     { command: x });
-//impl_from!(AppCmd: |x: PoolCmd|     AppCmd::Pool     { command: x });
 impl_from!(AppCmd: |x: ProjectCmd|  AppCmd::Project  { command: x });
 impl_from!(AppCmd: |x: SceneCmd|    AppCmd::Scene    { command: x });
 impl_from!(AppCmd: |x: ScenesCmd|   AppCmd::Scenes   { command: x });
@@ -18,6 +16,25 @@ impl_from!(AppCmd: |x: TracksCmd|   AppCmd::Tracks   { command: x });
         self.exit.exit();
         Ok(None)
     }
+    /// Switch to another set of contextual modes.
+    #[command(Mode = "mode")] pub fn cmd_mode (&mut self, modes: Vec<Arc<str>>) -> Perhaps<AppCmd> {
+        *self.modes_mut() = modes.into();
+        Ok(None)
+    }
+    /// Enter a contextual mode.
+    #[command(Enter = "enter")] pub fn cmd_mode_enter (&mut self, mode: Arc<str>) -> Perhaps<AppCmd> {
+        self.modes_mut().push(mode);
+        Ok(Some(AppCmd::Leave))
+    }
+    /// Leave a contextual mode.
+    #[command(Leave = "leave")] fn cmd_mode_leave (&mut self) -> Perhaps<AppCmd> {
+        let mode = self.modes_mut().pop();
+        Ok(mode.map(|mode|AppCmd::Enter { mode }))
+    }
+    /// Navigate along a contextual axis.
+    #[command(Axis = "axis")] pub fn cmd_axis (&mut self, command: AxisCmd) -> Perhaps<AppCmd> {
+        Ok(command.dispatch(self)?.map(Into::into))
+    }
     /// Cancel current selection.
     #[command(Cancel = "cancel")] pub fn cmd_cancel (&mut self) -> Perhaps<AppCmd> {
         todo!("cancel")
@@ -44,27 +61,22 @@ impl_from!(AppCmd: |x: TracksCmd|   AppCmd::Tracks   { command: x });
         std::mem::swap(&mut self.dialog, &mut dialog);
         Ok(Some(AppCmd::Dialog { dialog }))
     }
-    #[command(Mode = "mode")] pub fn cmd_mode (&mut self, command: ModeCmd) -> Perhaps<AppCmd> {
-        Ok(command.dispatch(self)?.map(Into::into))
-    }
-    #[command(Project = "session")] pub fn cmd_session (&mut self, command: ProjectCmd) -> Perhaps<AppCmd> {
-        Ok(command.dispatch(self)?.map(Into::into))
-    }
-    #[command(Axis = "axis")] pub fn cmd_axis (&mut self, command: AxisCmd) -> Perhaps<AppCmd> {
-        Ok(command.dispatch(self)?.map(Into::into))
-    }
+    /// Command the file browser.
     #[command(Browse = "browse")] pub fn cmd_browse (&mut self, command: BrowseCmd) -> Perhaps<AppCmd> {
         Ok(command.dispatch(self)?.map(Into::into))
     }
+    /// Commands that alter the current session.
+    #[command(Project = "session")] pub fn cmd_session (&mut self, command: ProjectCmd) -> Perhaps<AppCmd> {
+        Ok(command.dispatch(self)?.map(Into::into))
+    }
+    /// Commands pertaining to MIDI clips.
     #[command(MidiClip = "clip")] pub fn cmd_midi_clip (&mut self, command: MidiClipCmd) -> Perhaps<AppCmd> {
         Ok(command.dispatch(self)?.map(Into::into))
     }
+    /// Commands pertaining to the MIDI clip editor.
     #[command(MidiEdit = "edit")] pub fn cmd_midi_edit (&mut self, command: MidiEditCmd) -> Perhaps<AppCmd> {
         Ok(command.dispatch(self)?.map(Into::into))
     }
-    //#[command(Pool = "pool")] pub fn cmd_pool (&mut self, command: PoolCmd) -> Perhaps<AppCmd> {
-        //Ok(command.dispatch(self)?.map(Into::into))
-    //}
     #[command(Scene = "scene")] pub fn cmd_scene (&mut self, command: SceneCmd) -> Perhaps<AppCmd> {
         Ok(command.dispatch(self)?.map(Into::into))
     }
@@ -77,6 +89,9 @@ impl_from!(AppCmd: |x: TracksCmd|   AppCmd::Tracks   { command: x });
     #[command(Tracks = "tracks")] pub fn cmd_tracks (&mut self, command: TracksCmd) -> Perhaps<AppCmd> {
         Ok(command.dispatch(self)?.map(Into::into))
     }
+    //#[command(Pool = "pool")] pub fn cmd_pool (&mut self, command: PoolCmd) -> Perhaps<AppCmd> {
+        //Ok(command.dispatch(self)?.map(Into::into))
+    //}
 }
 
 impl<T: HasProject> ProjectControl for T {}
@@ -142,29 +157,17 @@ impl<T> ClockControl for T where T: HasClock
     }
 }
 
-impl<T: HasTracks
+impl<T> TracksControl for T where T: HasTracks
     + HasScenes
     + HasSelection
     + HasJack<'static>
-    + Namespace<usize>
-    + Namespace<Arc<[Connect]>>
-    + Namespace<Option<usize>>
-    + Namespace<Option<Arc<str>>>
-    + Namespace<Option<ItemTheme>>
-    + Namespace<Option<Arc<[Connect]>>>
     + Namespace<ClipPool>
-> TracksControl for T {}
+{}
 
 #[tek_proc::commands(TracksCmd)] pub trait TracksControl: HasTracks
     + HasScenes
     + HasSelection
     + HasJack<'static>
-    + Namespace<usize>
-    + Namespace<Arc<[Connect]>>
-    + Namespace<Option<usize>>
-    + Namespace<Option<Arc<str>>>
-    + Namespace<Option<ItemTheme>>
-    + Namespace<Option<Arc<[Connect]>>>
     + Namespace<ClipPool>
 {
     /// Stop all playing clips
@@ -190,7 +193,7 @@ impl<T: HasTracks
         Ok(None)
     }
     #[command(Add = "add")] fn tracks_add (&mut self) -> Perhaps<TracksCmd>
-        where Self: HasScenes + HasJack<'static>
+        where Self: HasScenes + HasJack<'static> + Sized
     {
         let (_index, _) = self.tracks_add_one(None, None, [].into(), [].into())?;
         Ok(None)
@@ -212,6 +215,76 @@ impl<T: HasTracks
         *self.selection_mut() = select;
         Ok(None)
     }
+
+    /// Run audio callbacks for every track and every device
+    fn tracks_jack_process (&mut self, client: &Client, scope: &ProcessScope) -> Control
+        where Self: HasJack<'static>
+    {
+        for track in self.tracks_mut().iter_mut() {
+            if Control::Quit == Audio::process(&mut track.sequencer, client, scope) {
+                return Control::Quit
+            }
+            for device in track.devices.iter_mut() {
+                if Control::Quit == DeviceAudio(device).process(client, scope) {
+                    return Control::Quit
+                }
+            }
+        }
+        Control::Continue
+    }
+
+    /// Add multiple tracks
+    fn tracks_add_many (
+        &mut self,
+        count: usize,
+        width: Option<usize>,
+        mins:  Arc<[Connect]>,
+        mouts: Arc<[Connect]>,
+    ) -> Usually<()>
+        where Self: HasJack<'static> + HasScenes
+    {
+        let track_color_1 = ItemColor::random();
+        let track_color_2 = ItemColor::random();
+        for i in 0..count {
+            let color = track_color_1.mix(track_color_2, i as f32 / count as f32).into();
+            let track = self.tracks_add_one(None, Some(color), mins.clone(), mouts.clone())?.1;
+            if let Some(width) = width {
+                track.width = width;
+            }
+        }
+        Ok(())
+    }
+
+    /// Add a track
+    fn tracks_add_one (
+        &mut self,
+        name:  Option<Arc<str>>,
+        color: Option<ItemTheme>,
+        mins:  Arc<[Connect]>,
+        mouts: Arc<[Connect]>,
+    ) -> Usually<(usize, &mut Track)>
+        where Self: HasJack<'static> + HasScenes
+    {
+        let name: Arc<str> = name.map_or_else(
+            ||format!("trk{}", self.tracks_last()).into(),
+            |x|x.to_string().into()
+        );
+        *self.tracks_last_mut() += 1;
+        let track = Track::new_added(self.jack(), Some(self.clock()), &name, color, None, mins, mouts)?;
+        self.tracks_mut().push(track);
+        let len = self.tracks().len();
+        let index = len - 1;
+        for scene in self.scenes_mut().iter_mut() {
+            while scene.clips.len() < len {
+                scene.clips.append(None);
+            }
+        }
+        Ok((index, &mut self.tracks_mut()[index]))
+    }
+
+    fn track_longest_name (&self) -> usize {
+        self.tracks().iter().map(|s|s.name.len()).fold(0, usize::max)
+    }
 }
 
 impl<T: HasTrack
@@ -283,9 +356,6 @@ impl<T: HasScenes
     + HasTrackScroll
     + HasSelection
     + HasJack<'static>
-    + Namespace<usize>
-    + Namespace<Option<ItemTheme>>
-    + Namespace<Option<Arc<str>>>
 > ScenesControl for T {}
 
 #[tek_proc::commands(ScenesCmd)] pub trait ScenesControl: HasScenes
@@ -293,11 +363,8 @@ impl<T: HasScenes
     + HasTrackScroll
     + HasSelection
     + HasJack<'static>
-    + Namespace<usize>
-    + Namespace<Option<ItemTheme>>
-    + Namespace<Option<Arc<str>>>
 {
-    #[command(Add = "add")] fn scenes_add (&mut self) -> Perhaps<ScenesCmd> {
+    #[command(Add = "add")] fn scenes_add (&mut self) -> Perhaps<ScenesCmd> where Self: Sized {
         let (_index, _) = self.scenes_add_one(None, None)?;
         Ok(None)
     }
@@ -318,6 +385,41 @@ impl<T: HasScenes
         *self.selection_mut() = select;
         Ok(None)
     }
+    /// Generate the default name for a new scene
+    fn scenes_default_name (&self) -> Arc<str> {
+        format!("s{:3>}", self.scenes().len() + 1).into()
+    }
+    fn scenes_longest_name (&self) -> usize {
+        self.scenes().iter().map(|s|s.name.len()).fold(0, usize::max)
+    }
+    /// Add multiple scenes
+    fn scenes_add_many (&mut self, n: usize)
+        -> Usually<()> where Self: HasTracks
+    {
+        let scene_color_1 = ItemColor::random();
+        let scene_color_2 = ItemColor::random();
+        for i in 0..n {
+            let _ = self.scenes_add_one(None, Some(
+                scene_color_1.mix(scene_color_2, i as f32 / n as f32).into()
+            ))?;
+        }
+        Ok(())
+    }
+    /// Add a scene
+    fn scenes_add_one (&mut self, name: Option<Arc<str>>, color: Option<ItemTheme>)
+        -> Usually<(usize, &mut Scene)>
+    where
+        Self: HasTracks
+    {
+        let scene = Scene {
+            name: name.map_or_else(||self.scenes_default_name(), |x|x.to_string().into()),
+            clips: Pool::from(vec![None;self.tracks().len()]),
+            color: color.unwrap_or_else(ItemTheme::random),
+        };
+        self.scenes_mut().push(scene);
+        let index = self.scenes().len() - 1;
+        Ok((index, &mut self.scenes_mut()[index]))
+    }
 }
 
 impl<T: HasScene
@@ -721,36 +823,6 @@ impl<T: HasClip + HasEditor
     ////}
 //}
 
-impl<T> ModeControl for T where T: HasModeStack
-    + Namespace<Vec<Arc<str>>> + Namespace<Arc<str>> + Namespace<usize>
-{}
-#[tek_proc::commands(ModeCmd)] pub trait ModeControl: HasModeStack
-    + Namespace<Vec<Arc<str>>> + Namespace<Arc<str>> + Namespace<usize>
-{
-    #[command(Reset = "reset")] fn mode_reset (&mut self, modes: Vec<Arc<str>>) -> Perhaps<ModeCmd> {
-        *self.modes_mut() = modes.into();
-        Ok(None)
-    }
-    #[command(Push = "push")] fn mode_push (&mut self, mode: Arc<str>) -> Perhaps<ModeCmd> {
-        self.modes_mut().push(mode);
-        Ok(Some(ModeCmd::Pop))
-    }
-    #[command(Pop = "pop")] fn mode_pop (&mut self) -> Perhaps<ModeCmd> {
-        let mode = self.modes_mut().pop();
-        Ok(mode.map(|mode|ModeCmd::Push { mode }))
-    }
-}
-
-pub trait HasClip {
-    fn clip (&self) -> Option<ArcRwLockReadGuard<RawRwLock, Option<Arc<RwLock<MidiClip>>>>> {
-        self.clip_slot().map(|slot|slot.read())
-    }
-    fn clip_mut (&self) -> Option<ArcRwLockWriteGuard<RawRwLock, Option<Arc<RwLock<MidiClip>>>>> {
-        self.clip_slot().map(|slot|slot.write())
-    }
-    fn clip_slot (&self) -> Option<Slot<MidiClip>>;
-}
-
 impl<T> MidiClipControl for T where T: HasClip
     + Namespace<Option<bool>> + Namespace<Option<ItemTheme>> {}
 #[tek_proc::commands(MidiClipCmd)] pub trait MidiClipControl: HasClip
diff --git a/src/tek_has.rs b/src/tek_has.rs
new file mode 100644
index 00000000..b74506a6
--- /dev/null
+++ b/src/tek_has.rs
@@ -0,0 +1,198 @@
+use crate::*;
+
+pub trait HasModeStack {
+    fn modes (&self) -> RwLockReadGuard<'_, Vec<Arc<str>>>;
+    fn modes_mut (&mut self) -> RwLockWriteGuard<'_, Vec<Arc<str>>>;
+}
+
+impl<T> HasEditor for T where T:
+    AsRef<Option<MidiEditor>> + AsMut<Option<MidiEditor>> {}
+pub trait HasEditor:
+    AsRef<Option<MidiEditor>> + AsMut<Option<MidiEditor>>
+{
+    fn editor (&self) -> &Option<MidiEditor> {
+        self.as_ref()
+    }
+    fn editor_mut (&mut self) -> &mut Option<MidiEditor> {
+        self.as_mut()
+    }
+}
+
+pub trait HasMidiBuffers {
+    fn note_buf_mut (&mut self) -> &mut Vec<u8>;
+    fn midi_buf_mut (&mut self) -> &mut Vec<Vec<Vec<u8>>>;
+}
+
+pub trait HasPlayClip: HasClock {
+    fn reset (&self) -> bool;
+    fn reset_mut (&mut self) -> &mut bool;
+    fn play_clip (&self) -> &Option<(Moment, Option<Arc<RwLock<MidiClip>>>)>;
+    fn play_clip_mut (&mut self) -> &mut Option<(Moment, Option<Arc<RwLock<MidiClip>>>)>;
+    fn next_clip (&self) -> &Option<(Moment, Option<Arc<RwLock<MidiClip>>>)>;
+    fn next_clip_mut (&mut self) -> &mut Option<(Moment, Option<Arc<RwLock<MidiClip>>>)>;
+}
+
+impl <T> HasSequencer for T where T:
+    AsRef<Sequencer> + AsMut<Sequencer> {}
+pub trait HasSequencer:
+    AsRef<Sequencer> + AsMut<Sequencer>
+{
+    fn sequencer (&self) -> &Sequencer {
+        self.as_ref()
+    }
+    fn sequencer_mut (&mut self) -> &mut Sequencer {
+        self.as_mut()
+    }
+}
+
+impl<T> HasClock for T where T:
+    AsRef<Clock> + AsMut<Clock> {}
+
+pub trait HasClock:
+    AsRef<Clock> + AsMut<Clock>
+{
+    fn clock (&self) -> &Clock {
+        self.as_ref()
+    }
+    fn clock_mut (&mut self) -> &mut Clock {
+        self.as_mut()
+    }
+}
+
+pub trait HasDevices:
+    AsRef<Vec<Device>> + AsMut<Vec<Device>>
+{
+    fn devices (&self) -> &Vec<Device> {
+        self.as_ref()
+    }
+    fn devices_mut (&mut self) -> &mut Vec<Device> {
+        self.as_mut()
+    }
+}
+
+pub trait HasProject:
+    AsRef<Option<Project>> + AsMut<Option<Project>>
+{}
+
+impl<T> HasProject for T where T:
+    AsRef<Option<Project>> + AsMut<Option<Project>>
+{}
+
+pub trait HasSceneScroll: HasScenes {
+    fn scene_scroll (&self) -> usize;
+}
+
+impl<T> HasScene for T where T:
+    AsRefOpt<Scene> + AsMutOpt<Scene> + Send + Sync
+{}
+
+pub trait HasScene:
+    AsRefOpt<Scene> + AsMutOpt<Scene>
+{
+    fn scene (&self) -> Option<&Scene> {
+        self.as_ref_opt()
+    }
+    fn scene_mut (&mut self) -> Option<&mut Scene> {
+        self.as_mut_opt()
+    }
+}
+
+impl<T> HasScenes for T where T:
+    AsRef<Vec<Scene>> + AsMut<Vec<Scene>>
+{}
+
+pub trait HasScenes: AsRef<Vec<Scene>> + AsMut<Vec<Scene>> {
+    fn scenes (&self) -> &Vec<Scene> {
+        self.as_ref()
+    }
+    fn scenes_mut (&mut self) -> &mut Vec<Scene> {
+        self.as_mut()
+    }
+}
+
+impl<T> HasSelection for T where T:
+    AsRef<Selection> + AsMut<Selection>
+{}
+
+pub trait HasSelection: AsRef<Selection> + AsMut<Selection> {
+    fn selection (&self) -> &Selection {
+        self.as_ref()
+    }
+    fn selection_mut (&mut self) -> &mut Selection {
+        self.as_mut()
+    }
+}
+
+impl<T> HasTrack for T where T:
+    AsRefOpt<Track> + AsMutOpt<Track>
+{}
+
+pub trait HasTrack: AsRefOpt<Track> + AsMutOpt<Track> {
+    fn track (&self) -> Option<&Track> {
+        self.as_ref_opt()
+    }
+    fn track_mut (&mut self) -> Option<&mut Track> {
+        self.as_mut_opt()
+    }
+}
+
+impl<T> HasTracks for T where T:
+    AsRef<Vec<Track>> + AsMut<Vec<Track>> + HasClock + HasTrackScroll
+{}
+
+pub trait HasTracks: AsRef<Vec<Track>> + AsMut<Vec<Track>> + HasClock + HasTrackScroll {
+    /// Read-only reference to collection of [Track]s.
+    fn tracks (&self) -> &Vec<Track> {
+        self.as_ref()
+    }
+    /// Mutable reference to collection of [Track]s.
+    fn tracks_mut (&mut self) -> &mut Vec<Track> {
+        self.as_mut()
+    }
+}
+
+pub trait HasTrackScroll {
+    fn track_scroll (&self) -> usize;
+    fn tracks_last (&self) -> usize;
+    fn tracks_last_mut (&mut self) -> &mut usize;
+}
+
+pub trait HasSampler: AsRef<Sampler> + AsMut<Sampler> {
+    fn sampler (&self) -> &Sampler {
+        self.as_ref()
+    }
+    fn sampler_mut (&mut self) -> &mut Sampler {
+        self.as_mut()
+    }
+}
+
+pub trait HasClip {
+    fn clip_slot (&self) -> Option<Slot<MidiClip>>;
+    fn clip (&self) -> Option<ArcRwLockReadGuard<RawRwLock, Option<Arc<RwLock<MidiClip>>>>> {
+        self.clip_slot().map(|slot|slot.read())
+    }
+    fn clip_mut (&self) -> Option<ArcRwLockWriteGuard<RawRwLock, Option<Arc<RwLock<MidiClip>>>>> {
+        self.clip_slot().map(|slot|slot.write())
+    }
+}
+
+pub trait HasWidth {
+    const MIN_WIDTH: usize;
+    /// Increment track width.
+    fn width_inc (&mut self);
+    /// Decrement track width, down to a hardcoded minimum of [Self::MIN_WIDTH].
+    fn width_dec (&mut self);
+}
+
+pub trait HasClipsSize {
+    /// Size of clips area.
+    fn clips_size (&self) -> &Sizer;
+    /// Draw content annotated with value of [Self::clips_size].
+    fn with_clips_size (&self, show: bool, content: impl Draw<Tui>) -> impl Draw<Tui> {
+        let size = self.clips_size();
+        above(
+            when(show, fg(Green, east!(size.w() as usize, "x", size.h() as usize)).align_se()),
+            size.of(content.align_c().full_wh())
+        )
+    }
+}
diff --git a/src/tek_mode.rs b/src/tek_mode.rs
index b4aa8970..0cfb6ad2 100644
--- a/src/tek_mode.rs
+++ b/src/tek_mode.rs
@@ -116,11 +116,6 @@ impl AsMut<Mode> for Mode {
     }
 }
 
-pub trait HasModeStack {
-    fn modes     (&self)     -> RwLockReadGuard<'_, Vec<Arc<str>>>;
-    fn modes_mut (&mut self) -> RwLockWriteGuard<'_, Vec<Arc<str>>>;
-}
-
 impl HasModeStack for App {
     fn modes (&self) -> RwLockReadGuard<'_, Vec<Arc<str>>> {
         self.modes.read()
diff --git a/src/tek_pool.rs b/src/tek_pool.rs
index 308ea183..8272455d 100644
--- a/src/tek_pool.rs
+++ b/src/tek_pool.rs
@@ -41,7 +41,7 @@ impl<T> Pool<T> {
 }
 
 impl Pool<MidiClip> {
-    pub fn eval <'a> (_: &App, _: impl Language) -> Perhaps<ClipPool> {
+    pub fn eval <'a, T> (_: &T, _: impl Language) -> Perhaps<ClipPool> {
         todo!()
     }
     pub fn remove (&self, filter: &MidiClip) {
diff --git a/src/tek_view.rs b/src/tek_view.rs
index c46c6fb5..8f4e6473 100644
--- a/src/tek_view.rs
+++ b/src/tek_view.rs
@@ -600,18 +600,6 @@ impl OctaveVertical {
 
 impl HasClipsSize for App { fn clips_size (&self) -> &Sizer { &self.project.size_inner } }
 impl HasClipsSize for Project { fn clips_size (&self) -> &Sizer { &self.size_inner } }
-pub trait HasClipsSize {
-    /// Size of clips area.
-    fn clips_size (&self) -> &Sizer;
-    /// Draw content annotated with value of [Self::clips_size].
-    fn with_clips_size (&self, show: bool, content: impl Draw<Tui>) -> impl Draw<Tui> {
-        let size = self.clips_size();
-        above(
-            when(show, fg(Green, east!(size.w() as usize, "x", size.h() as usize)).align_se()),
-            size.of(content.align_c().full_wh())
-        )
-    }
-}
 
 impl MidiEditor {
     pub fn clip_status (&self) -> impl Draw<Tui> + '_ {
@@ -668,6 +656,8 @@ impl<T> TracksView for T where T:
 pub trait TracksView:
     HasTracks + ScenesView + HasMidiIns + HasMidiOuts + HasTrack
 {
+    /// Spacing between tracks.
+    const TRACK_SPACING: usize = 0;
 
     /// Iterate over tracks with their corresponding sizes.
     fn tracks_with_sizes (&self) -> impl TracksSizes<'_> {
@@ -880,7 +870,7 @@ pub trait ScenesView: HasEditor + HasSelection + HasSceneScroll + HasClipsSize +
     fn w_side   (&self) -> u16;
     fn w_mid    (&self) -> u16;
 
-    fn view_scenes_names (&self) -> impl Draw<Tui> {
+    fn view_scenes_names (&self) -> impl Draw<Tui> where Self: Sized {
         let select  = self.selection();
         let editor  = self.editor();
         let editing = self.is_editing();