diff --git a/crates/tek_core/src/command.rs b/crates/tek_core/src/command.rs
new file mode 100644
index 00000000..d2653176
--- /dev/null
+++ b/crates/tek_core/src/command.rs
@@ -0,0 +1,44 @@
+use crate::*;
+
+pub const fn key (code: KeyCode) -> KeyEvent {
+    KeyEvent {
+        code,
+        modifiers: KeyModifiers::NONE,
+        kind:      crossterm::event::KeyEventKind::Press,
+        state:     crossterm::event::KeyEventState::NONE
+    }
+}
+
+pub const fn ctrl (key: KeyEvent) -> KeyEvent {
+    KeyEvent { modifiers: key.modifiers.union(KeyModifiers::CONTROL), ..key }
+}
+
+pub const fn alt (key: KeyEvent) -> KeyEvent {
+    KeyEvent { modifiers: key.modifiers.union(KeyModifiers::ALT), ..key }
+}
+
+pub const fn shift (key: KeyEvent) -> KeyEvent {
+    KeyEvent { modifiers: key.modifiers.union(KeyModifiers::SHIFT), ..key }
+}
+
+pub trait Command<T>: Sized {
+    fn run (&self, state: &mut T) -> Perhaps<Self>;
+}
+
+pub trait HandleKey<C: Command<Self> + 'static>: Sized {
+    const HANDLE_KEY_MAP: &'static [(KeyEvent, C)];
+    fn handle_key (&mut self, key: &KeyEvent) -> Perhaps<C> {
+        let mut run_command: Option<&'static C> = None;
+        for (binding, command) in Self::HANDLE_KEY_MAP.iter() {
+            if key == binding {
+                run_command = Some(command);
+                break
+            }
+        }
+        if let Some(command) = run_command {
+            command.run(self)
+        } else {
+            Ok(None)
+        }
+    }
+}
diff --git a/crates/tek_core/src/lib.rs b/crates/tek_core/src/lib.rs
index 8f132bf8..6a8bc071 100644
--- a/crates/tek_core/src/lib.rs
+++ b/crates/tek_core/src/lib.rs
@@ -38,6 +38,7 @@ use std::fmt::{Debug, Display};
 submod! {
     audio
     color
+    command
     edn
     engine
     focus
diff --git a/crates/tek_sequencer/src/sequencer_cmd.rs b/crates/tek_sequencer/src/sequencer_cmd.rs
index 7d9ee33c..21cbb653 100644
--- a/crates/tek_sequencer/src/sequencer_cmd.rs
+++ b/crates/tek_sequencer/src/sequencer_cmd.rs
@@ -1,4 +1,26 @@
 use crate::*;
+
+enum SequencerCommand {
+    FocusNext,
+    FocusPrev,
+    FocusUp,
+    FocusDown,
+    FocusLeft,
+    FocusRight,
+    Transport(TransportCommand),
+    Phrase(PhrasePoolCommand),
+    Editor(PhraseEditorCommand),
+}
+
+enum PhrasePoolCommand {
+}
+
+enum PhraseLengthCommand {
+}
+
+enum PhraseEditorCommand {
+}
+
 /// Handle top-level events in standalone sequencer.
 impl Handle<Tui> for Sequencer<Tui> {
     fn handle (&mut self, from: &TuiInput) -> Perhaps<bool> {
diff --git a/crates/tek_sequencer/src/transport_cmd.rs b/crates/tek_sequencer/src/transport_cmd.rs
index 8b22a0a7..8523fb4d 100644
--- a/crates/tek_sequencer/src/transport_cmd.rs
+++ b/crates/tek_sequencer/src/transport_cmd.rs
@@ -1,55 +1,172 @@
 use crate::*;
+
 impl Handle<Tui> for TransportToolbar<Tui> {
     fn handle (&mut self, from: &TuiInput) -> Perhaps<bool> {
-        match from.event() {
-            key!(KeyCode::Left)  => { self.focus.prev(); },
-            key!(KeyCode::Right) => { self.focus.next(); },
-            _ => match self.focus {
-                TransportToolbarFocus::PlayPause => return self.handle_play_pause(from),
-                TransportToolbarFocus::Bpm       => return self.handle_bpm(from),
-                TransportToolbarFocus::Quant     => return self.handle_quant(from),
-                TransportToolbarFocus::Sync      => return self.handle_sync(from),
-                TransportToolbarFocus::Clock     => {/*todo*/},
-            }
+        if let TuiEvent::Input(crossterm::event::Event::Key(event)) = from.event() {
+            let _undo = self.handle_key(event)?;
+            return Ok(Some(true))
         }
-        Ok(Some(true))
+        Ok(None)
     }
 }
-impl TransportToolbar<Tui> {
-    fn handle_play_pause (&mut self, from: &TuiInput) -> Perhaps<bool> {
-        match from.event() {
-            key!(KeyCode::Enter) => self.toggle_play().map(|_|())?,
-            _ => return Ok(None)
+
+#[derive(Clone)]
+pub enum TransportCommand {
+    FocusNext,
+    FocusPrev,
+    PlayFromStart,
+    TogglePlay,
+    Increment,
+    Decrement,
+    FineIncrement,
+    FineDecrement,
+    SeekUsec(f64),
+    SeekSample(f64),
+    SeekPulse(f64),
+    SetBpm(f64),
+    SetQuant(f64),
+    SetSync(f64),
+}
+
+impl HandleKey<TransportCommand> for TransportToolbar<Tui> {
+    const HANDLE_KEY_MAP: &'static [(KeyEvent, TransportCommand)] = &[
+        (      key(KeyCode::Char(' ')),  TransportCommand::FocusPrev),
+        (shift(key(KeyCode::Char(' '))), TransportCommand::FocusPrev),
+        (      key(KeyCode::Left),       TransportCommand::FocusPrev),
+        (      key(KeyCode::Right),      TransportCommand::FocusNext),
+        (      key(KeyCode::Char('.')),  TransportCommand::Increment),
+        (      key(KeyCode::Char(',')),  TransportCommand::Decrement),
+        (      key(KeyCode::Char('>')),  TransportCommand::FineIncrement),
+        (      key(KeyCode::Char('<')),  TransportCommand::FineDecrement),
+    ];
+}
+
+impl<E: Engine> Command<TransportToolbar<E>> for TransportCommand {
+    fn run (&self, state: &mut TransportToolbar<E>) -> Perhaps<Self> {
+        match self {
+            Self::FocusNext => {
+                state.focus.next();
+            },
+            Self::FocusPrev => {
+                state.focus.prev();
+            },
+            Self::TogglePlay => {
+                state.toggle_play()?;
+            },
+            Self::Increment => {
+                match state.focus {
+                    TransportToolbarFocus::Bpm => {
+                        let bpm = state.clock.timebase().bpm.get();
+                        return Self::SetBpm(bpm + 1.0).run(state)
+                    },
+                    TransportToolbarFocus::Quant => {
+                        let quant = state.clock.quant.get() as usize;
+                        let quant = next_note_length(quant) as f64;
+                        return Self::SetQuant(quant).run(state)
+                    },
+                    TransportToolbarFocus::Sync => {
+                        let sync = state.clock.sync.get() as usize;
+                        let sync = next_note_length(sync) as f64;
+                        return Self::SetSync(sync + 1.0).run(state)
+                    },
+                    TransportToolbarFocus::PlayPause => {
+                        /*todo seek*/
+                    },
+                    TransportToolbarFocus::Clock => {
+                        /*todo seek*/
+                    },
+                }
+            },
+            Self::FineIncrement => {
+                match state.focus {
+                    TransportToolbarFocus::Bpm => {
+                        let bpm = state.clock.timebase().bpm.get();
+                        return Self::SetBpm(bpm + 0.001).run(state)
+                    },
+                    TransportToolbarFocus::Quant => {
+                        return Self::Increment.run(state)
+                    },
+                    TransportToolbarFocus::Sync => {
+                        return Self::Increment.run(state)
+                    },
+                    TransportToolbarFocus::PlayPause => {
+                        /*todo seek*/
+                    },
+                    TransportToolbarFocus::Clock => {
+                        /*todo seek*/
+                    },
+                }
+            },
+            Self::Decrement => {
+                match state.focus {
+                    TransportToolbarFocus::Bpm => {
+                        let bpm = state.clock.timebase().bpm.get();
+                        return Self::SetBpm(bpm - 1.0).run(state)
+                    },
+                    TransportToolbarFocus::Quant => {
+                        let quant = state.clock.quant.get() as usize;
+                        let quant = prev_note_length(quant) as f64;
+                        return Self::SetQuant(quant).run(state)
+                    },
+                    TransportToolbarFocus::Sync => {
+                        let sync = state.clock.sync.get() as usize;
+                        let sync = prev_note_length(sync) as f64;
+                        return Self::SetSync(sync).run(state)
+                    },
+                    TransportToolbarFocus::PlayPause => {
+                        /*todo seek*/
+                    },
+                    TransportToolbarFocus::Clock => {
+                        /*todo seek*/
+                    },
+                }
+            },
+            Self::FineDecrement => {
+                match state.focus {
+                    TransportToolbarFocus::Bpm => {
+                        let bpm = state.clock.timebase().bpm.get();
+                        return Self::SetBpm(bpm - 0.001).run(state)
+                    },
+                    TransportToolbarFocus::Quant => {
+                        return Self::Decrement.run(state)
+                    },
+                    TransportToolbarFocus::Sync => {
+                        return Self::Decrement.run(state)
+                    },
+                    TransportToolbarFocus::PlayPause => {
+                        /*todo seek*/
+                    },
+                    TransportToolbarFocus::Clock => {
+                        /*todo seek*/
+                    },
+                }
+            },
+            Self::SeekUsec(usec) => {
+                state.clock.current.update_from_usec(*usec);
+            },
+            Self::SeekSample(sample) => {
+                state.clock.current.update_from_sample(*sample);
+            },
+            Self::SeekPulse(pulse) => {
+                state.clock.current.update_from_pulse(*pulse);
+            },
+            Self::SetBpm(bpm) => {
+                let old_bpm = state.clock.timebase().bpm.get();
+                state.clock.timebase().bpm.set(*bpm);
+                return Ok(Some(Self::SetBpm(old_bpm)))
+            },
+            Self::SetQuant(quant) => {
+                let old_quant = state.clock.quant.get();
+                state.clock.quant.set(*quant);
+                return Ok(Some(Self::SetQuant(old_quant)))
+            },
+            Self::SetSync(sync) => {
+                let old_sync = state.clock.sync.get();
+                state.clock.sync.set(*sync);
+                return Ok(Some(Self::SetSync(old_sync)))
+            },
+            _ => { unimplemented!() }
         }
-        Ok(Some(true))
-    }
-    fn handle_bpm (&mut self, from: &TuiInput) -> Perhaps<bool> {
-        let bpm = self.clock.timebase().bpm.get();
-        match from.event() {
-            key!(KeyCode::Char(',')) => { self.clock.timebase().bpm.set(bpm - 1.0);   },
-            key!(KeyCode::Char('.')) => { self.clock.timebase().bpm.set(bpm + 1.0);   },
-            key!(KeyCode::Char('<')) => { self.clock.timebase().bpm.set(bpm - 0.001); },
-            key!(KeyCode::Char('>')) => { self.clock.timebase().bpm.set(bpm + 0.001); },
-            _ => return Ok(None)
-        }
-        Ok(Some(true))
-    }
-    fn handle_quant (&mut self, from: &TuiInput) -> Perhaps<bool> {
-        let quant = self.clock.quant.get() as usize;
-        match from.event() {
-            key!(KeyCode::Char(',')) => { self.clock.quant.set(prev_note_length(quant) as f64); },
-            key!(KeyCode::Char('.')) => { self.clock.quant.set(next_note_length(quant) as f64); },
-            _ => return Ok(None)
-        }
-        return Ok(Some(true))
-    }
-    fn handle_sync (&mut self, from: &TuiInput) -> Perhaps<bool> {
-        let sync = self.clock.sync.get() as usize;
-        match from.event() {
-            key!(KeyCode::Char(',')) => { self.clock.quant.set(prev_note_length(sync) as f64); },
-            key!(KeyCode::Char('.')) => { self.clock.quant.set(next_note_length(sync) as f64); },
-            _ => return Ok(None)
-        }
-        return Ok(Some(true))
+        Ok(None)
     }
 }