diff --git a/crates/app/src/api.rs b/crates/app/src/api.rs
index 1790ddc1..bb1d067c 100644
--- a/crates/app/src/api.rs
+++ b/crates/app/src/api.rs
@@ -7,10 +7,11 @@ macro_rules! cmd_todo { ($msg:literal) => {{ println!($msg); None }}; }
 handle!(TuiIn: |self: App, input|self.handle_tui_key_with_history(input));
 impl App {
     fn handle_tui_key_with_history (&mut self, input: &TuiIn) -> Perhaps<bool> {
-        Ok(if let Some(command) = self.config.keys.handle(self, input)? {
-            // FIXME failed commands not persisted in undo history
-            let undo = command.clone().execute(self)?;
-            self.history.push((command, undo));
+        Ok(if let Some(binding) = self.config.keys.dispatch(input.event()) {
+            let binding = binding.clone();
+            let undo = binding.command.clone().execute(self)?;
+            // FIXME failed commands are not persisted in undo history
+            //self.history.push((binding.command.clone(), undo));
             Some(true)
         } else {
             None
diff --git a/crates/app/src/model.rs b/crates/app/src/model.rs
index 40d9b508..113ec3b4 100644
--- a/crates/app/src/model.rs
+++ b/crates/app/src/model.rs
@@ -1,5 +1,6 @@
 use crate::*;
 use std::path::PathBuf;
+use std::error::Error;
 #[derive(Default, Debug)]
 pub struct App {
     /// Must not be dropped for the duration of the process
@@ -9,7 +10,7 @@ pub struct App {
     /// Performance counter
     pub perf: PerfModel,
     // View and input definition
-    pub config: Configuration<Ast>,
+    pub config: Configuration,
     /// Contains all recently created clips.
     pub pool: Pool,
     /// Contains the currently edited musical arrangement
@@ -319,7 +320,7 @@ impl App {
 
 /// Configuration
 #[derive(Default, Debug)]
-pub struct Configuration<T: Dsl> {
+pub struct Configuration {
     /// Path of configuration entrypoint
     pub path: PathBuf,
     /// Name of configuration
@@ -327,99 +328,39 @@ pub struct Configuration<T: Dsl> {
     /// Description of configuration
     pub info: Option<Arc<str>>,
     /// View definition
-    pub view: T,
+    pub view: Arc<str>,
     // Input keymap
-    pub keys: EventMap<TuiEvent, T>,
+    pub keys: EventMap<TuiEvent, AppCommand>,
 }
 
-impl<T: Dsl> Configuration<T> {
-    pub fn from_path (path: &impl AsRef<Path>, _watch: bool) -> Usually<Self> where T: for<'a> From<&'a str> {
-        let mut dsl = T::from(read_and_leak(path.as_ref())?);
-        let mut name: Option<T::Exp> = None;
-        let mut info: Option<T::Exp> = None;
-        let mut view: Option<T::Exp> = None;
-        let mut keys: Option<T::Exp> = None;
-        dsl.exp_each(|form|Ok(match form.exp_head().dsl() {
-            Val::Key(key) => match key.as_ref() {
-                "name" => name = Some(form.exp_tail()),
-                "info" => info = Some(form.exp_tail()),
-                "keys" => keys = Some(form.exp_tail()),
-                "view" => view = Some(form.exp_tail()),
-                _ => return Err(format!("(e3) unexpected key {key:?} in {form:?}").into())
-            },
-            _ => return Err(format!("(e2) unexpected exp {form :?}").into())
-        }))?;
-        Ok(Self {
-            path: path.as_ref().into(),
-            info: info.map(Self::parse_info).flatten(),
-            name: name.map(Self::parse_name).flatten(),
-            view: Self::parse_view(view)?.into(),
-            keys: Self::parse_keys(&path, keys)?.into(),
-        })
-    }
-    fn parse_name (dsl: T) -> Option<Arc<str>> {
-        dsl.str().map(Into::into)
-    }
-    fn parse_info (dsl: T) -> Option<Arc<str>> {
-        dsl.str().map(Into::into)
-    }
-    fn parse_view (dsl: Option<T>) -> Usually<T> {
-        match dsl { Some(view) => Ok(view), _ => Err(format!("missing view definition").into()) }
-    }
-    fn parse_keys (base: &impl AsRef<Path>, dsl: Option<T>) -> Usually<EventMap<TuiIn, T>> {
-        let mut map = EventMap::default();
-        let mut keys = if let Some(keys) = dsl { keys } else {
-            return Err(format!("missing keys definition").into())
-        };
-        keys.exp_each(|form|Ok(match form.exp_head().dsl() {
-            Val::Sym(s) if s.as_ref() == "layer" =>
-                Self::parse_keys_layer(&mut map, base, form.exp_tail()),
-            Val::Sym(s) if s.as_ref() == "layer-if" =>
-                Self::parse_keys_layer_if(&mut map, base, form.exp_tail()),
-            x =>
-                return Err(format!("(e3) unexpected {x:?} in {form:?}").into())
-        }))?;
-        Ok(map)
-    }
-    fn parse_keys_layer (map: &mut EventMap<TuiIn, T>, base: &impl AsRef<Path>, exp: &T) {
-        let next = exp.peek().map(|x|x.val());
-        if let Some(Val::Str(path)) = next {
-            let path = base.as_ref().parent().unwrap().join(unquote(path));
-            if !std::fs::exists(&path)? {
-                return Err(format!("(e5) not found: {path:?}").into())
+impl Configuration {
+    pub fn from_path (path: &impl AsRef<Path>, _watch: bool) -> Usually<Self> {
+        let mut config = Self::default();
+        config.path = path.as_ref().into();
+        let mut dsl = read_and_leak(path.as_ref())?;
+        while let Some(mut exp) = dsl.exp_next()? {
+            match exp.exp_head()?.key()? {
+                Some("name") => match exp.text()? {
+                    Some(name) => config.name = Some(name.into()),
+                    _ => return Err(format!("missing name definition").into())
+                },
+                Some("info") => match exp.text()? {
+                    Some(info) => config.info = Some(info.into()),
+                    _ => return Err(format!("missing info definition").into())
+                },
+                Some("keys") => match exp.text()? {
+                    Some(keys) => config.keys = EventMap::from_dsl(keys)?,
+                    _ => return Err(format!("missing keys definition").into())
+                },
+                Some("view") => match exp.exp_tail()? {
+                    Some(tail) => config.view = tail.src().into(),
+                    _ => return Err(format!("missing view definition").into())
+                },
+                Some(k) => return Err(format!("(e3) unexpected key {k:?} in {exp:?}").into()),
+                None => return Err(format!("(e2) unexpected exp {exp:?}").into()),
             }
-            map.add_layer(read_and_leak(path)?.into());
-            print!("layer:\n  path: {:?}...", exp.0.0.trim());
-            println!("ok");
-        } else {
-            return Err(format!("(e4) unexpected non-string {next:?}").into())
-        }
-    }
-    fn parse_keys_layer_if (map: &mut EventMap<TuiIn, T>, base: &impl AsRef<Path>, exp: &T) {
-        let next = exp.next().map(|x|x.val());
-        let cond = if let Some(Val::Sym(sym)) = next {
-            leak(sym)
-        } else {
-            return Err(format!("(e4) unexpected non-symbol {next:?}").into())
-        };
-
-        let next = exp.peek().map(|x|x.val());
-        if let Some(Val::Str(path)) = next {
-            let path = base.as_ref().parent().unwrap().join(unquote(path));
-            if !std::fs::exists(&path)? {
-                return Err(format!("(e5) not found: {path:?}").into())
-            }
-            print!("layer-if:\n  cond: {cond}\n  path: {path:?}...");
-            let keys = read_and_leak(path)?.into();
-            println!("ok");
-            //map.add_layer_if(
-                //Box::new(move |state: &App|Take::take_or_fail(
-                    //state, exp, ||"missing input layer conditional"
-                //)), keys
-            //);
-        } else {
-            return Err(format!("(e4) unexpected non-symbol {next:?}").into())
         }
+        Ok(config)
     }
 }
 
diff --git a/deps/tengri b/deps/tengri
index 7b67d29c..360b404b 160000
--- a/deps/tengri
+++ b/deps/tengri
@@ -1 +1 @@
-Subproject commit 7b67d29c012f2d39a5d9d2fcd840417c90256503
+Subproject commit 360b404b69abb1ec4e0e9959667e08d4b99c6131