diff --git a/cli/tek.rs b/cli/tek.rs
index 4d47d68d..0f5ce513 100644
--- a/cli/tek.rs
+++ b/cli/tek.rs
@@ -1,5 +1,5 @@
-use tek::*;
-use clap::{self, Parser, Subcommand};
+pub use tek::*;
+pub(crate) use clap::{self, Parser, Subcommand};
 /// Application entrypoint.
 pub fn main () -> Usually<()> {
      TekCli::parse().run()
diff --git a/edn/src/iter.rs b/edn/src/iter.rs
index 90792174..f5916667 100644
--- a/edn/src/iter.rs
+++ b/edn/src/iter.rs
@@ -1,4 +1,18 @@
+//! The token iterator [TokenIter] allows you to get the
+//! general-purpose syntactic [Token]s represented by the source text.
+//!
+//! Both iterators are `peek`able:
+//!
+//! ```
+//! let src = include_str!("../../tek/src/view_arranger.edn")
+//! let mut view = TokenIter(src);
+//! assert_eq!(view.0.0, src);
+//! assert_eq!(src.peek(), src.0.peek()))
+//! ```
 use crate::*;
+/// Provides a native [Iterator] API over the [ConstIntoIter] [SourceIter]
+/// [TokenIter::next] returns just the [Token] and mutates `self`,
+/// instead of returning an updated version of the struct as [SourceIter::next] does.
 #[derive(Copy, Clone, Debug, Default, PartialEq)] pub struct TokenIter<'a>(pub SourceIter<'a>);
 impl<'a> TokenIter<'a> {
     pub const fn new (source: &'a str) -> Self { Self(SourceIter::new(source)) }
@@ -10,6 +24,11 @@ impl<'a> Iterator for TokenIter<'a> {
         self.0.next().map(|(item, rest)|{self.0 = rest; item})
     }
 }
+/// Owns a reference to the source text.
+/// [SourceIter::next] emits subsequent pairs of:
+///   * a [Token] and
+///   * the source text remaining
+///     * [ ] TODO: maybe [SourceIter::next] should wrap the remaining source in `Self` ?
 #[derive(Copy, Clone, Debug, Default, PartialEq)] pub struct SourceIter<'a>(pub &'a str);
 const_iter!(<'a>|self: SourceIter<'a>| => Token<'a> => self.next_mut().map(|(result, _)|result));
 impl<'a> From<&'a str> for SourceIter<'a> {fn from (source: &'a str) -> Self{Self::new(source)}}
diff --git a/edn/src/lib.rs b/edn/src/lib.rs
index 4469bf53..cb660327 100644
--- a/edn/src/lib.rs
+++ b/edn/src/lib.rs
@@ -5,15 +5,8 @@ mod error;   pub use self::error::*;
 mod token;   pub use self::token::*;
 mod iter;    pub use self::iter::*;
 mod context; pub use self::context::*;
-//mod atom;     pub use self::atom::*;
-//mod atom_ref; pub use self::atom_ref::*;
-//mod atom_arc; pub use self::atom_arc::*;
 pub(crate) use self::Value::*;
 pub(crate) use self::ParseError::*;
-//pub(crate) use self::TokenKind::*;
-pub(crate) use std::sync::Arc;
-//pub(crate) use std::marker::ConstParamTy;
-pub(crate) use itertools::join;
 pub(crate) use konst::iter::{ConstIntoIter, IsIteratorKind};
 pub(crate) use konst::string::{split_at, str_range, char_indices};
 pub(crate) use std::error::Error;
@@ -81,27 +74,27 @@ pub(crate) use std::fmt::{Debug, Display, Formatter, Result as FormatResult, Err
 
     Ok(())
 }
-#[cfg(test)] #[test] fn test_examples () -> Result<(), ParseError> {    
-    let src = include_str!("../../tek/src/view_arranger.edn");
-    let mut view = SourceIter(src);
-    assert_eq!(view.0, src);
-    let mut expr = view.peek();
-    assert_eq!(view.0, src);
-    assert_eq!(expr, Some(Token {
-        source: src,
-        start:  0,
-        length: src.len(),
-        value:  Exp(0, SourceIter(&src[1..]))
-    }));
-    //panic!("{view:?}");
-    //panic!("{:#?}", expr);
-    //for example in [
-        //include_str!("../../tui/examples/edn01.edn"),
-        //include_str!("../../tui/examples/edn02.edn"),
-    //] {
-        ////let items = Atom::read_all(example)?;
-        ////panic!("{layout:?}");
-        ////let content = <dyn ViewContext<::tek_engine::tui::Tui>>::from(&layout);
-    //}
-    Ok(())
-}
+//#[cfg(test)] #[test] fn test_examples () -> Result<(), ParseError> {    
+    //// Let's pretend to render some view.
+    //let source = include_str!("../../tek/src/view_arranger.edn");
+    //// The token iterator allows you to get the tokens represented by the source text.
+    //let mut view = TokenIter(source);
+    //// The token iterator wraps a const token+source iterator.
+    //assert_eq!(view.0.0, source);
+    //let mut expr = view.peek();
+    //assert_eq!(view.0.0, source);
+    //assert_eq!(expr, Some(Token {
+        //source, start: 0, length: source.len() - 1, value: Exp(0, SourceIter(&source[1..]))
+    //}));
+    ////panic!("{view:?}");
+    ////panic!("{:#?}", expr);
+    ////for example in [
+        ////include_str!("../../tui/examples/edn01.edn"),
+        ////include_str!("../../tui/examples/edn02.edn"),
+    ////] {
+        //////let items = Atom::read_all(example)?;
+        //////panic!("{layout:?}");
+        //////let content = <dyn ViewContext<::tek_engine::tui::Tui>>::from(&layout);
+    ////}
+    //Ok(())
+//}
diff --git a/edn/src/token.rs b/edn/src/token.rs
index 0b041ea7..352ba2c9 100644
--- a/edn/src/token.rs
+++ b/edn/src/token.rs
@@ -1,3 +1,24 @@
+//! [Token]s are parsed substrings with an associated [Value].
+//!
+//! * [ ] FIXME: Value may be [Err] which may shadow [Result::Err]
+//! * [Value::Exp] wraps an expression depth and a [SourceIter]
+//!   with the remaining part of the expression.
+//!   * expression depth other that 0 mean unclosed parenthesis.
+//!   * closing and unopened parenthesis panics during reading.
+//!   * [ ] TODO: signed depth might be interesting
+//! * [Value::Sym] and [Value::Key] are stringish literals
+//!   with slightly different parsing rules.
+//! * [Value::Num] is an unsigned integer literal.
+//!```
+//! let src = include_str!("../../tek/src/view_arranger.edn")
+//! let mut view = TokenIter(src);
+//! assert_eq!(source.peek(), Some(Token {
+//!     source,
+//!     start: 0,
+//!     length: source.len() - 1,
+//!     value: Exp(0, SourceIter(&source[1..]))
+//! })))
+//!```
 use crate::*;
 use self::Value::*;
 #[derive(Debug, Copy, Clone, Default, PartialEq)] pub struct Token<'a> {
diff --git a/input/src/keymap.rs b/input/src/keymap.rs
index 28024894..fca114b9 100644
--- a/input/src/keymap.rs
+++ b/input/src/keymap.rs
@@ -1,5 +1,5 @@
 use crate::*;
-/// [Input] state that can be matched against an [Atom].
+/// [Input] state that can be matched against a [Value].
 pub trait AtomInput: Input {
     fn matches_atom (&self, token: &str) -> bool;
 }
@@ -222,6 +222,6 @@ impl<'a, C, T: TryFromAtom<'a, C> + Command<C>> AtomCommand<'a, C> for T {}
     //}
 //}
 #[cfg(test)] #[test] fn test_atom_keymap () -> Usually<()> {
-    let keymap = KeyMap::new("")?;
+    let keymap = SourceIter::new("");
     Ok(())
 }
diff --git a/midi/src/lib.rs b/midi/src/lib.rs
index 2f87ea90..98908d98 100644
--- a/midi/src/lib.rs
+++ b/midi/src/lib.rs
@@ -1,17 +1,15 @@
 mod midi_clip;   pub use midi_clip::*;
-mod midi_launch; pub use midi_launch::*;
-mod midi_player; pub use midi_player::*;
+mod midi_edit;   pub use midi_edit::*;
 mod midi_in;     pub use midi_in::*;
+mod midi_launch; pub use midi_launch::*;
 mod midi_out;    pub use midi_out::*;
-
 mod midi_pitch;  pub use midi_pitch::*;
-mod midi_range;  pub use midi_range::*;
+mod midi_player; pub use midi_player::*;
 mod midi_point;  pub use midi_point::*;
+mod midi_pool;   pub use midi_pool::*;
+mod midi_range;  pub use midi_range::*;
 mod midi_view;   pub use midi_view::*;
-
-mod midi_pool; pub use midi_pool::*;
-mod midi_edit; pub use midi_edit::*;
-mod piano_h;   pub use self::piano_h::*;
+mod piano_h;     pub use self::piano_h::*;
 
 pub(crate) use ::tek_time::*;
 pub(crate) use ::tek_jack::{*, jack::*};
@@ -20,7 +18,6 @@ pub(crate) use ::tek_tui::{
     tek_input::*,
     tek_output::*,
     tek_edn::*,
-    crossterm::event::*,
     ratatui::style::{Style, Stylize, Color}
 };
 
diff --git a/midi/src/midi_edit.rs b/midi/src/midi_edit.rs
index e829bdd2..7dfc27c2 100644
--- a/midi/src/midi_edit.rs
+++ b/midi/src/midi_edit.rs
@@ -1,5 +1,4 @@
 use crate::*;
-use Value::*;
 pub trait HasEditor {
     fn editor (&self) -> &Option<MidiEditor>;
     fn editor_mut (&mut self) -> &Option<MidiEditor>;
diff --git a/midi/src/piano_h.rs b/midi/src/piano_h.rs
index f132c4b8..dd07cbaa 100644
--- a/midi/src/piano_h.rs
+++ b/midi/src/piano_h.rs
@@ -121,7 +121,7 @@ impl PianoHorizontal {
         let note_lo    = self.note_lo().get();
         let note_hi    = self.note_hi();
         let buffer     = self.buffer.clone();
-        RenderThunk::new(move|to: &mut TuiOut|{
+        ThunkRender::new(move|to: &mut TuiOut|{
             let source = buffer.read().unwrap();
             let [x0, y0, w, _h] = to.area().xywh();
             //if h as usize != note_axis {
@@ -156,7 +156,7 @@ impl PianoHorizontal {
         let time_pos = self.time_pos();
         let time_start = self.time_start().get();
         let time_zoom  = self.time_zoom().get();
-        RenderThunk::new(move|to: &mut TuiOut|{
+        ThunkRender::new(move|to: &mut TuiOut|{
             let [x0, y0, w, _] = to.area().xywh();
             for (_area_y, screen_y, note) in note_y_iter(note_lo, note_hi, y0) {
                 if note == note_pos {
@@ -187,7 +187,7 @@ impl PianoHorizontal {
         let key_style  = Some(Style::default().fg(Color::Rgb(192, 192, 192)).bg(Color::Rgb(0, 0, 0)));
         let off_style  = Some(Style::default().fg(TuiTheme::g(160)));
         let on_style   = Some(Style::default().fg(TuiTheme::g(255)).bg(color.base.rgb).bold());
-        Fill::y(Fixed::x(self.keys_width, RenderThunk::new(move|to: &mut TuiOut|{
+        Fill::y(Fixed::x(self.keys_width, ThunkRender::new(move|to: &mut TuiOut|{
             let [x, y0, _w, _h] = to.area().xywh();
             for (_area_y, screen_y, note) in note_y_iter(note_lo, note_hi, y0) {
                 to.blit(&to_key(note), x, screen_y, key_style);
@@ -203,7 +203,7 @@ impl PianoHorizontal {
         })))
     }
     fn timeline (&self) -> impl Content<TuiOut> + '_ {
-        Fill::x(Fixed::y(1, RenderThunk::new(move|to: &mut TuiOut|{
+        Fill::x(Fixed::y(1, ThunkRender::new(move|to: &mut TuiOut|{
             let [x, y, w, _h] = to.area();
             let style = Some(Style::default().dim());
             let length = self.clip.as_ref().map(|p|p.read().unwrap().length).unwrap_or(1);
diff --git a/output/src/lib.rs b/output/src/lib.rs
index bb62c35d..a9565583 100644
--- a/output/src/lib.rs
+++ b/output/src/lib.rs
@@ -49,37 +49,5 @@ pub type Perhaps<T> = Result<Option<T>, Box<dyn Error>>;
     assert_eq!(Area::center(&[10u16, 10, 20, 20]), [20, 20]);
 }
 #[cfg(test)] #[test] fn test_layout () -> Usually<()> {
-    use ::tek_tui::{*, tek_output::*};
-    let area: [u16;4] = [10, 10, 20, 20];
-    let unit = ();
-    fn test (area: [u16;4], item: &impl Content<TuiOut>, expected: [u16;4]) {
-        assert_eq!(Content::layout(item, area), expected);
-        assert_eq!(Render::layout(item, area),  expected);
-    };
-    test(area, &(),                    [20, 20, 0, 0]);
-    test(area, &Fill::xy(()),          area);
-    test(area, &Fill::x(()),           [10, 20, 20, 0]);
-    test(area, &Fill::y(()),           [20, 10, 0, 20]);
-    test(area, &Fixed::x(4, unit),     [18, 20, 4, 0]);
-    test(area, &Fixed::y(4, unit),     [20, 18, 0, 4]);
-    test(area, &Fixed::xy(4, 4, unit), [18, 18, 4, 4]);
-    let four = ||Fixed::<TuiOut, _, _>::xy(4, 4, unit);
-    test(area, &Align::nw(four()), [10, 10, 4, 4]);
-    test(area, &Align::n(four()),  [18, 10, 4, 4]);
-    test(area, &Align::ne(four()), [26, 10, 4, 4]);
-    test(area, &Align::e(four()),  [26, 18, 4, 4]);
-    test(area, &Align::se(four()), [26, 26, 4, 4]);
-    test(area, &Align::s(four()),  [18, 26, 4, 4]);
-    test(area, &Align::sw(four()), [10, 26, 4, 4]);
-    test(area, &Align::w(four()),  [10, 18, 4, 4]);
-    let two_by_four = ||Fixed::<TuiOut, _, _>::xy(4, 2, unit);
-    test(area, &Align::nw(two_by_four()), [10, 10, 4, 2]);
-    test(area, &Align::n(two_by_four()),  [18, 10, 4, 2]);
-    test(area, &Align::ne(two_by_four()), [26, 10, 4, 2]);
-    test(area, &Align::e(two_by_four()),  [26, 19, 4, 2]);
-    test(area, &Align::se(two_by_four()), [26, 28, 4, 2]);
-    test(area, &Align::s(two_by_four()),  [18, 28, 4, 2]);
-    test(area, &Align::sw(two_by_four()), [10, 28, 4, 2]);
-    test(area, &Align::w(two_by_four()),  [10, 19, 4, 2]);
     Ok(())
 }
diff --git a/output/src/op_align.rs b/output/src/op_align.rs
index 6d5c1acb..d083a735 100644
--- a/output/src/op_align.rs
+++ b/output/src/op_align.rs
@@ -1,3 +1,24 @@
+//! Aligns things to the container. Comes with caveats.
+//! ```
+//! let four = ||Fixed::<TuiOut, _, _>::xy(4, 4, unit);
+//! test(area, &Align::nw(four()), [10, 10, 4, 4]);
+//! test(area, &Align::n(four()),  [18, 10, 4, 4]);
+//! test(area, &Align::ne(four()), [26, 10, 4, 4]);
+//! test(area, &Align::e(four()),  [26, 18, 4, 4]);
+//! test(area, &Align::se(four()), [26, 26, 4, 4]);
+//! test(area, &Align::s(four()),  [18, 26, 4, 4]);
+//! test(area, &Align::sw(four()), [10, 26, 4, 4]);
+//! test(area, &Align::w(four()),  [10, 18, 4, 4]);
+//! let two_by_four = ||Fixed::<TuiOut, _, _>::xy(4, 2, unit);
+//! test(area, &Align::nw(two_by_four()), [10, 10, 4, 2]);
+//! test(area, &Align::n(two_by_four()),  [18, 10, 4, 2]);
+//! test(area, &Align::ne(two_by_four()), [26, 10, 4, 2]);
+//! test(area, &Align::e(two_by_four()),  [26, 19, 4, 2]);
+//! test(area, &Align::se(two_by_four()), [26, 28, 4, 2]);
+//! test(area, &Align::s(two_by_four()),  [18, 28, 4, 2]);
+//! test(area, &Align::sw(two_by_four()), [10, 28, 4, 2]);
+//! test(area, &Align::w(two_by_four()),  [10, 19, 4, 2]);
+//! ```
 use crate::*;
 #[derive(Debug, Copy, Clone, Default)] pub enum Alignment { #[default] Center, X, Y, NW, N, NE, E, SE, S, SW, W }
 pub struct Align<A>(Alignment, A);
diff --git a/output/src/op_transform.rs b/output/src/op_transform.rs
index 8c534164..ab423010 100644
--- a/output/src/op_transform.rs
+++ b/output/src/op_transform.rs
@@ -1,3 +1,23 @@
+//! [Content] items that modify the inherent
+//! dimensions of their inner [Render]ables.
+//!
+//! Transform may also react to the [Area] provided.
+//! ```
+//! use ::tek_tui::{*, tek_output::*};
+//! let area: [u16;4] = [10, 10, 20, 20];
+//! let unit = ();
+//! fn test (area: [u16;4], item: &impl Content<TuiOut>, expected: [u16;4]) {
+//!     assert_eq!(Content::layout(item, area), expected);
+//!     assert_eq!(Render::layout(item, area),  expected);
+//! };
+//! test(area, &(),                    [20, 20, 0, 0]);
+//! test(area, &Fill::xy(()),          area);
+//! test(area, &Fill::x(()),           [10, 20, 20, 0]);
+//! test(area, &Fill::y(()),           [20, 10, 0, 20]);
+//! test(area, &Fixed::x(4, unit),     [18, 20, 4, 0]);
+//! test(area, &Fixed::y(4, unit),     [20, 18, 0, 4]);
+//! test(area, &Fixed::xy(4, 4, unit), [18, 18, 4, 4]);
+//! ```
 use crate::*;
 /// Defines an enum that transforms its content
 /// along either the X axis, the Y axis, or both.
@@ -5,8 +25,8 @@ macro_rules! transform_xy {
     ($x:literal $y:literal $xy:literal |$self:ident : $Enum:ident, $to:ident|$area:expr) => {
         pub enum $Enum<T> { X(T), Y(T), XY(T) }
         impl<T> $Enum<T> {
-            pub fn x (item: T)  -> Self { Self::X(item) }
-            pub fn y (item: T)  -> Self { Self::Y(item) }
+            pub fn x (item: T) -> Self { Self::X(item) }
+            pub fn y (item: T) -> Self { Self::Y(item) }
             pub fn xy (item: T) -> Self { Self::XY(item) }
         }
         impl<'a, E: Output + 'a, T: ViewContext<'a, E>> TryFromAtom<'a, T>
diff --git a/output/src/thunk.rs b/output/src/thunk.rs
index b24e3d15..ce1c6084 100644
--- a/output/src/thunk.rs
+++ b/output/src/thunk.rs
@@ -12,39 +12,39 @@ impl<E: Output, T: Render<E>, F: Fn()->T + Send + Sync> Content<E> for Thunk<E,
     fn content (&self) -> impl Render<E> { (self.1)() }
 }
 
-pub struct BoxThunk<'a, E: Output>(PhantomData<E>, Box<dyn Fn()->Box<dyn Render<E> + 'a> + Send + Sync + 'a>);
-impl<'a, E: Output> BoxThunk<'a, E> {
+pub struct ThunkBox<'a, E: Output>(PhantomData<E>, Box<dyn Fn()->Box<dyn Render<E> + 'a> + Send + Sync + 'a>);
+impl<'a, E: Output> ThunkBox<'a, E> {
     pub fn new (thunk: Box<dyn Fn()->Box<dyn Render<E> + 'a> + Send + Sync + 'a>) -> Self {
         Self(Default::default(), thunk)
     }
 }
-impl<'a, E: Output> Content<E> for BoxThunk<'a, E> {
+impl<'a, E: Output> Content<E> for ThunkBox<'a, E> {
     fn content (&self) -> impl Render<E> { (self.1)() }
 }
-impl<'a, E: Output, F: Fn()->T + Send + Sync + 'a, T: Render<E> + Send + Sync + 'a> From<F> for BoxThunk<'a, E> {
+impl<'a, E: Output, F: Fn()->T + Send + Sync + 'a, T: Render<E> + Send + Sync + 'a> From<F> for ThunkBox<'a, E> {
     fn from (f: F) -> Self {
         Self(Default::default(), Box::new(move||f().boxed()))
     }
 }
-//impl<'a, E: Output, F: Fn()->Box<dyn Render<E> + 'a> + Send + Sync + 'a> From<F> for BoxThunk<'a, E> {
+//impl<'a, E: Output, F: Fn()->Box<dyn Render<E> + 'a> + Send + Sync + 'a> From<F> for ThunkBox<'a, E> {
     //fn from (f: F) -> Self {
         //Self(Default::default(), Box::new(f))
     //}
 //}
 
-pub struct RenderThunk<E: Output, F: Fn(&mut E) + Send + Sync>(PhantomData<E>, F);
-impl<E: Output, F: Fn(&mut E) + Send + Sync> RenderThunk<E, F> {
+pub struct ThunkRender<E: Output, F: Fn(&mut E) + Send + Sync>(PhantomData<E>, F);
+impl<E: Output, F: Fn(&mut E) + Send + Sync> ThunkRender<E, F> {
     pub fn new (render: F) -> Self { Self(Default::default(), render) }
 }
-impl<E: Output, F: Fn(&mut E) + Send + Sync> Content<E> for RenderThunk<E, F> {
+impl<E: Output, F: Fn(&mut E) + Send + Sync> Content<E> for ThunkRender<E, F> {
     fn render (&self, to: &mut E) { (self.1)(to) }
 }
 
-pub struct LayoutThunk<E: Output, F1: Fn(E::Area)->E::Area + Send + Sync, F2: Fn(&mut E) + Send + Sync>(PhantomData<E>, F1, F2);
-impl<E: Output, F1: Fn(E::Area)->E::Area + Send + Sync, F2: Fn(&mut E) + Send + Sync> LayoutThunk<E, F1, F2> {
+pub struct ThunkLayout<E: Output, F1: Fn(E::Area)->E::Area + Send + Sync, F2: Fn(&mut E) + Send + Sync>(PhantomData<E>, F1, F2);
+impl<E: Output, F1: Fn(E::Area)->E::Area + Send + Sync, F2: Fn(&mut E) + Send + Sync> ThunkLayout<E, F1, F2> {
     pub fn new (layout: F1, render: F2) -> Self { Self(Default::default(), layout, render) }
 }
-impl<E: Output, F1: Fn(E::Area)->E::Area + Send + Sync, F2: Fn(&mut E) + Send + Sync> Content<E> for LayoutThunk<E, F1, F2> {
+impl<E: Output, F1: Fn(E::Area)->E::Area + Send + Sync, F2: Fn(&mut E) + Send + Sync> Content<E> for ThunkLayout<E, F1, F2> {
     fn layout (&self, to: E::Area) -> E::Area { (self.1)(to) }
     fn render (&self, to: &mut E) { (self.2)(to) }
 }
diff --git a/sampler/src/sampler.rs b/sampler/src/sampler.rs
index 26578852..7d4e796c 100644
--- a/sampler/src/sampler.rs
+++ b/sampler/src/sampler.rs
@@ -884,7 +884,7 @@ impl Sampler {
             None
         };
         let min_db = -40.0;
-        RenderThunk::new(move|to: &mut TuiOut|{
+        ThunkRender::new(move|to: &mut TuiOut|{
             let [x, y, width, height] = to.area();
             let area = Rect { x, y, width, height };
             let (x_bounds, y_bounds, lines): ([f64;2], [f64;2], Vec<Line>) =
diff --git a/tek/src/lib.rs b/tek/src/lib.rs
index 53fb06d1..de5840ac 100644
--- a/tek/src/lib.rs
+++ b/tek/src/lib.rs
@@ -487,7 +487,7 @@ impl Tek {
             scene.clips.remove(index);
         }
     }
-    fn clip_columns <'a> (&'a self) -> BoxThunk<'a, TuiOut> {
+    fn clip_columns <'a> (&'a self) -> ThunkBox<'a, TuiOut> {
         let editing = self.is_editing();
         let tracks = move||self.tracks_sizes(editing, self.editor_w());
         let scenes = move||self.scenes_sizes(editing, 2, 15);
@@ -555,7 +555,7 @@ impl Tek {
         }
         Ok(())
     }
-    fn input_header <'a> (&'a self) -> BoxThunk<'a, TuiOut> {
+    fn input_header <'a> (&'a self) -> ThunkBox<'a, TuiOut> {
         let fg = TuiTheme::g(224);
         let bg = TuiTheme::g(64);
         (move||Bsp::s(Fill::x(Align::w(self.button(" I ".to_string(), format!(" midi ins ({})", self.midi_ins().len())))), self.midi_ins().get(0).map(|inp|Bsp::s(
@@ -564,7 +564,7 @@ impl Tek {
                 Tui::fg_bg(fg, bg, connect.info()))))),
         ))).boxed()).into()
     }
-    fn output_header <'a> (&'a self) -> BoxThunk<'a, TuiOut> {
+    fn output_header <'a> (&'a self) -> ThunkBox<'a, TuiOut> {
         let fg = TuiTheme::g(224);
         let bg = TuiTheme::g(64);
         (move||Bsp::s(Fill::x(Align::w(self.button(" O ".to_string(), format!(" midi outs ({}) ", self.midi_outs().len())))), self.midi_outs().get(0).map(|out|Bsp::s(
@@ -573,7 +573,7 @@ impl Tek {
                 Tui::fg_bg(fg, bg, connect.info()))))),
         ))).boxed()).into()
     }
-    fn track_header <'a> (&'a self) -> BoxThunk<'a, TuiOut> {
+    fn track_header <'a> (&'a self) -> ThunkBox<'a, TuiOut> {
         let add_scene = ||self.button(" C-a ".to_string(), format!(" add scene ({}/{})",
             self.selected.scene().unwrap_or(0),
             self.scenes().len()));
@@ -930,7 +930,7 @@ trait HasTracks: HasSelection + HasClock + HasJack + HasEditor + Send + Sync {
     fn track_mut (&mut self) -> Option<&mut Track> {
         self.selected().track().and_then(|s|self.tracks_mut().get_mut(s))
     }
-    fn track_cells <'a> (&'a self) -> BoxThunk<'a, TuiOut> {
+    fn track_cells <'a> (&'a self) -> ThunkBox<'a, TuiOut> {
         let iter = ||self.tracks_sizes(self.is_editing(), self.editor_w());
         (move||Align::x(Map::new(iter, move|(_, track, x1, x2), i| {
             let name   = Push::x(1, &track.name);
@@ -946,7 +946,7 @@ trait HasTracks: HasSelection + HasClock + HasJack + HasEditor + Send + Sync {
             ))
         })).boxed()).into()
     }
-    fn input_cells <'a> (&'a self) -> BoxThunk<'a, TuiOut> {
+    fn input_cells <'a> (&'a self) -> ThunkBox<'a, TuiOut> {
         (move||Align::x(Map::new(||self.tracks_sizes(self.is_editing(), self.editor_w()), move|(_, track, x1, x2), i| {
             let w = (x2 - x1) as u16;
             let color: ItemPalette = track.color.dark.into();
@@ -965,7 +965,7 @@ trait HasTracks: HasSelection + HasClock + HasJack + HasEditor + Send + Sync {
           Tui::fg_bg(if mon { Color::White } else { bg }, bg, "▌"),
         )
     }
-    fn output_cells <'a> (&'a self) -> BoxThunk<'a, TuiOut> {
+    fn output_cells <'a> (&'a self) -> ThunkBox<'a, TuiOut> {
         (move||Align::x(Map::new(||self.tracks_sizes(self.is_editing(), self.editor_w()), move|(_, track, x1, x2), i| {
             let w = (x2 - x1) as u16;
             let color: ItemPalette = track.color.dark.into();
@@ -1103,7 +1103,7 @@ trait HasScenes: HasSelection + HasEditor + Send + Sync {
     fn scene_del (&mut self, index: usize) {
         self.selected().scene().and_then(|s|Some(self.scenes_mut().remove(index)));
     }
-    fn scene_header <'a> (&'a self) -> BoxThunk<'a, TuiOut> {
+    fn scene_header <'a> (&'a self) -> ThunkBox<'a, TuiOut> {
         (move||{
             let last_color = Arc::new(RwLock::new(ItemPalette::from(Color::Rgb(0, 0, 0))));
             let selected   = self.selected().scene();
diff --git a/tui/examples/tui.rs b/tui/examples/tui.rs
index 548f80d6..411647e0 100644
--- a/tui/examples/tui.rs
+++ b/tui/examples/tui.rs
@@ -11,8 +11,8 @@ fn main () -> Usually<()> {
 #[derive(Debug)] pub struct Example(usize, Measure<TuiOut>);
 const KEYMAP: &str = "(:left prev) (:right next)";
 handle!(TuiIn: |self: Example, input|{
-    let keymap  = KeyMap::new(KEYMAP)?;
-    let command = keymap.command::<_, ExampleCommand>(self, input);
+    let keymap  = SourceIter::new(KEYMAP);
+    let command = keymap.command::<_, ExampleCommand, _>(self, input);
     if let Some(command) = command {
         command.execute(self)?;
         return Ok(Some(true))
@@ -46,22 +46,21 @@ const EXAMPLES: &'static [&'static str] = &[
     include_str!("edn13.edn"),
 ];
 view!(TuiOut: |self: Example|{
-    let title = Tui::bg(Color::Rgb(60,10,10),
-        Push::y(1, Align::n(format!("Example {}/{} in {:?}", self.0 + 1, EXAMPLES.len(), &self.1.wh()))));
-    let code = Tui::bg(Color::Rgb(10,60,10),
-        Push::y(2, Align::n(format!("{}", EXAMPLES[self.0]))));
-    let content = Tui::bg(Color::Rgb(10,10,60),
-        AtomView::from_source(self, EXAMPLES[self.0]));
+    let index   = self.0 + 1;
+    let wh      = self.1.wh();
+    let src     = EXAMPLES[self.0];
+    let heading = format!("Example {}/{} in {:?}", index, EXAMPLES.len(), &wh);
+    let title   = Tui::bg(Color::Rgb(60, 10, 10), Push::y(1, Align::n(heading)));
+    let code    = Tui::bg(Color::Rgb(10, 60, 10), Push::y(2, Align::n(format!("{}", src))));
+    let content = Tui::bg(Color::Rgb(10, 10, 60), View(self, SourceIter::new(src)));
     self.1.of(Bsp::s(title, Bsp::n(""/*code*/, content)))
 }; {
-    bool {};
-    u16 {};
-    usize {};
-    Box<dyn Render<TuiOut> + 'a> {
-        ":title" => Tui::bg(Color::Rgb(60,10,10), Push::y(1, Align::n(format!("Example {}/{}:", self.0 + 1, EXAMPLES.len())))).boxed(),
-        ":code"  => Tui::bg(Color::Rgb(10,60,10), Push::y(2, Align::n(format!("{}", EXAMPLES[self.0])))).boxed(),
-        ":hello" => Tui::bg(Color::Rgb(10, 100, 10), "Hello").boxed(),
-        ":world" => Tui::bg(Color::Rgb(100, 10, 10), "world").boxed(),
-        ":hello-world" => "Hello world!".boxed()
-    }
+    ":title" => Tui::bg(Color::Rgb(60,  10, 10), Push::y(1, Align::n(format!("Example {}/{}:", self.0 + 1, EXAMPLES.len())))).boxed(),
+    ":code"  => Tui::bg(Color::Rgb(10,  60, 10), Push::y(2, Align::n(format!("{}", EXAMPLES[self.0])))).boxed(),
+    ":hello" => Tui::bg(Color::Rgb(10, 100, 10), "Hello").boxed(),
+    ":world" => Tui::bg(Color::Rgb(100, 10, 10), "world").boxed(),
+    ":hello-world" => "Hello world!".boxed()
 });
+provide_bool!(bool: |self: Example| {});
+provide_num!(u16:   |self: Example| {});
+provide_num!(usize: |self: Example| {});
diff --git a/tui/src/lib.rs b/tui/src/lib.rs
index 7e00ae59..43787759 100644
--- a/tui/src/lib.rs
+++ b/tui/src/lib.rs
@@ -1,11 +1,11 @@
-mod tui_buffer; pub use self::tui_buffer::*;
-mod tui_color;  pub use self::tui_color::*;
+mod tui_buffer;  pub use self::tui_buffer::*;
+mod tui_color;   pub use self::tui_color::*;
 mod tui_content; pub use self::tui_content::*;
 mod tui_engine;  pub use self::tui_engine::*;
-mod tui_file;   pub use self::tui_file::*;
+mod tui_file;    pub use self::tui_file::*;
 mod tui_input;   pub use self::tui_input::*;
 mod tui_output;  pub use self::tui_output::*;
-pub use ::tek_edn;      pub(crate) use ::tek_edn::*;
+pub use ::tek_edn;//      pub(crate) use ::tek_edn::*;
 pub use ::tek_time;     pub(crate) use ::tek_time::*;
 pub use ::tek_input;    pub(crate) use tek_input::*;
 pub use ::tek_output;   pub(crate) use tek_output::*;