diff --git a/src/device/arrange.rs b/src/device/arrange.rs
index fa481c92..3b19c891 100644
--- a/src/device/arrange.rs
+++ b/src/device/arrange.rs
@@ -46,40 +46,83 @@ pub struct Arrangement {
     #[cfg(feature = "scene")]  pub scene_scroll: usize,
 }
 
-def_command!(TrackCommand: |track: Track| {
-    Stop => { track.sequencer.enqueue_next(None); Ok(None) },
-    SetRec   { rec: Option<bool> } => toggle_bool(&mut track.sequencer.recording,  rec, |rec|Self::SetRec { rec }),
-    SetMon   { mon: Option<bool> } => toggle_bool(&mut track.sequencer.monitoring, mon, |mon|Self::SetMon { mon }),
-    SetMute  { mute: Option<bool> } => todo!(),
-    SetSolo  { solo: Option<bool> } => todo!(),
-    SetSize  { size: usize } => todo!(),
-    SetZoom  { zoom: usize } => todo!(),
-    SetName  { name: Arc<str> } => swap_value(&mut track.name, name, |name|Self::SetName { name }),
-    SetColor { color: ItemTheme } => swap_value(&mut track.color, color, |color|Self::SetColor { color }),
-});
+#[tek_proc::commands(TrackCommand = "track")]
+impl Track {
+    #[command(Stop = "stop")]
+    fn stop (&mut self) -> Perhaps<TrackCommand> {
+        self.sequencer.enqueue_next(None);
+        Ok(None)
+    }
+    #[command(SetRec = "rec")]
+    fn set_rec (&mut self, rec: Option<bool>) -> Perhaps<TrackCommand> {
+        toggle_bool(&mut self.sequencer.recording, &rec, |rec|TrackCommand::SetRec { rec })
+    }
+    #[command(SetMon = "mon")]
+    fn set_mon (&mut self, mon: Option<bool>) -> Perhaps<TrackCommand> {
+        toggle_bool(&mut self.sequencer.monitoring, &mon, |mon|TrackCommand::SetMon { mon })
+    }
+    #[command(SetMute = "mute")]
+    fn set_mute (&mut self, mute: Option<bool>) -> Perhaps<TrackCommand> {
+        todo!()
+    }
+    #[command(SetSolo = "solo")]
+    fn set_solo (&mut self, solo: Option<bool>) -> Perhaps<TrackCommand> {
+        todo!()
+    }
+    #[command(SetSize = "size")]
+    fn set_size (&mut self, size: usize) -> Perhaps<TrackCommand> {
+        todo!()
+    }
+    #[command(SetZoom = "zoom")]
+    fn set_zoom (&mut self, zoom: usize) -> Perhaps<TrackCommand> {
+        todo!()
+    }
+    #[command(SetName = "name")]
+    fn set_name (&mut self, name: Arc<str>) -> Perhaps<TrackCommand> {
+        swap_value(&mut self.name, &name, |name|TrackCommand::SetName { name })
+    }
+    #[command(SetColor = "color")]
+    fn set_color (&mut self, color: ItemTheme) -> Perhaps<TrackCommand> {
+        swap_value(&mut self.color, &color, |color|TrackCommand::SetColor { color })
+    }
+}
 
-def_command!(SceneCommand: |scene: Scene| {
-    SetSize { size: usize } => { todo!() },
-    SetZoom { size: usize } => { todo!() },
-    SetName { name: Arc<str> } =>
-        swap_value(&mut scene.name, name, |name|Self::SetName{name}),
-    SetColor { color: ItemTheme } =>
-        swap_value(&mut scene.color, color, |color|Self::SetColor{color}),
-});
+#[tek_proc::commands(SceneCommand = "scene")]
+impl Scene {
+    #[command(SetSize = "size")]
+    fn set_size (&mut self, size: usize) -> Perhaps<SceneCommand> {
+        todo!()
+    }
+    #[command(SetZoom = "zoom")]
+    fn set_zoom (&mut self, size: usize) -> Perhaps<SceneCommand> {
+        todo!()
+    }
+    #[command(SetName = "name")]
+    fn set_name (&mut self, name: Arc<str>) -> Perhaps<SceneCommand> {
+        swap_value(&mut self.name, &name, |name|SceneCommand::SetName{name})
+    }
+    #[command(SetColor = "color")]
+    fn set_color (&mut self, color: ItemTheme) -> Perhaps<SceneCommand> {
+        swap_value(&mut self.color, &color, |color|SceneCommand::SetColor{color})
+    }
+}
 
-def_command!(ClipCommand: |clip: MidiClip| {
-    SetColor { color: Option<ItemTheme> } => {
+#[tek_proc::commands(ClipCommand = "clip")]
+impl MidiClip {
+    #[command(SetColor = "color")]
+    fn set_color (&mut self, color: Option<ItemTheme>) -> Perhaps<ClipCommand> {
         //(SetColor [t: usize, s: usize, c: ItemTheme]
             //clip.clip_set_color(t, s, c).map(|o|Self::SetColor(t, s, o)))));
             //("color"   [a: usize, b: usize] Some(Self::SetColor(a.unwrap(), b.unwrap(), ItemTheme::random())))
         todo!()
-    },
-    SetLoop { looping: Option<bool> } => {
+    }
+    #[command(SetLoop = "loop")]
+    fn set_loop (&mut self, looping: Option<bool>) -> Perhaps<ClipCommand> {
         //(SetLoop  [t: usize, s: usize, l: bool] cmd_todo!("\n\rtodo: {self:?}"))
             //("loop"    [a: usize, b: usize, c: bool] Some(Self::SetLoop(a.unwrap(), b.unwrap(), c.unwrap())))
         todo!()
     }
-});
+}
 
 /// Represents the current user selection in the arranger
 #[derive(PartialEq, Clone, Copy, Debug, Default)]
@@ -1068,3 +1111,27 @@ macro_rules! def_sizes_iter {
 def_sizes_iter!(PortsSizes   => Arc<str>, [Connect]);
 def_sizes_iter!(ScenesSizes  => Scene);
 def_sizes_iter!(TracksSizes  => Track);
+
+fn swap_value <T: Clone + PartialEq, U> (
+    target: &mut T, value: &T, returned: impl Fn(T)->U
+) -> Perhaps<U> {
+    if *target == *value {
+        Ok(None)
+    } else {
+        let mut value = value.clone();
+        std::mem::swap(target, &mut value);
+        Ok(Some(returned(value)))
+    }
+}
+
+fn toggle_bool <U> (
+    target: &mut bool, value: &Option<bool>, returned: impl Fn(Option<bool>)->U
+) -> Perhaps<U> {
+    let mut value = value.unwrap_or(!*target);
+    if value == *target {
+        Ok(None)
+    } else {
+        std::mem::swap(target, &mut value);
+        Ok(Some(returned(Some(value))))
+    }
+}
diff --git a/src/device/browse.rs b/src/device/browse.rs
index e9bed1cf..82be27c1 100644
--- a/src/device/browse.rs
+++ b/src/device/browse.rs
@@ -19,8 +19,8 @@ impl Browse {
         todo!()
     }
     /// Set current directory
-    #[command(SetPath = "set-path")]
-    fn set_path (&mut self, _path: PathBuf) -> Perhaps<BrowseCommand> {
+    #[command(Chdir = "chdir")]
+    fn chdir (&mut self, _path: PathBuf) -> Perhaps<BrowseCommand> {
         todo!()
     }
     /// Set current filter
@@ -35,15 +35,6 @@ impl Browse {
     }
 }
 
-def_command!(FileBrowserCommand: |_browse: Browse|{
-    //("begin"   []            Some(Self::Begin))
-    //("cancel"  []            Some(Self::Cancel))
-    //("confirm" []            Some(Self::Confirm))
-    //("select"  [i: usize]    Some(Self::Select(i.expect("no index"))))
-    //("chdir"   [p: PathBuf]  Some(Self::Chdir(p.expect("no path"))))
-    //("filter"  [f: Arc<str>] Some(Self::Filter(f.expect("no filter")))))
-});
-
 /// Browses for files to load/save.
 ///
 /// ```
@@ -104,7 +95,7 @@ impl Browse {
         }
         Ok(Self { cwd, dirs, files, ..Default::default() })
     }
-    pub fn chdir (&self) -> Usually<Self> { Self::new(Some(self.path())) }
+    pub fn to_chdir (&self) -> Usually<Self> { Self::new(Some(self.path())) }
     pub fn len (&self) -> usize { self.dirs.len() + self.files.len() }
     pub fn is_dir (&self) -> bool { self.index < self.dirs.len() }
     pub fn is_file (&self) -> bool { self.index >= self.dirs.len() }
diff --git a/src/device/clock.rs b/src/device/clock.rs
index e34ae47c..a59d179e 100644
--- a/src/device/clock.rs
+++ b/src/device/clock.rs
@@ -20,36 +20,61 @@ impl App {
     }
 }
 
-def_command!(ClockCommand: |clock: Clock| {
-    SeekUsec   { usec:   f64 } => {
-        clock.playhead.update_from_usec(*usec); Ok(None) },
-    SeekSample { sample: f64 } => {
-        clock.playhead.update_from_sample(*sample); Ok(None) },
-    SeekPulse  { pulse:  f64 } => {
-        clock.playhead.update_from_pulse(*pulse); Ok(None) },
-    SetBpm     { bpm:    f64 } => Ok(Some(
-        Self::SetBpm { bpm: clock.timebase().bpm.set(*bpm) })),
-    SetQuant   { quant:  f64 } => Ok(Some(
-        Self::SetQuant { quant: clock.quant.set(*quant) })),
-    SetSync    { sync:   f64 } => Ok(Some(
-        Self::SetSync { sync: clock.sync.set(*sync) })),
+#[tek_proc::commands(ClockCommand = "clock")]
+impl Clock {
+    #[command(SeekUsec = "usec")]
+    fn seek_usec (&mut self, usec: f64) -> Perhaps<ClockCommand> {
+        self.playhead.update_from_usec(usec);
+        Ok(None)
+    }
 
-    Play  { position: Option<u32> } => {
-        clock.play_from(*position)?; Ok(None) /* TODO Some(Pause(previousPosition)) */ },
-    Pause { position: Option<u32> } => {
-        clock.pause_at(*position)?; Ok(None) },
+    #[command(SeekSample = "sample")]
+    fn seek_sample (&mut self, sample: f64) -> Perhaps<ClockCommand> {
+        self.playhead.update_from_sample(sample);
+        Ok(None)
+    }
 
-    TogglePlayback { position: u32 } => Ok(if clock.is_rolling() {
-        clock.pause_at(Some(*position))?; None
-    } else {
-        clock.play_from(Some(*position))?; None
-    }),
-});
+    #[command(SeekPulse = "pulse")]
+    fn seek_pulse (&mut self, pulse: f64) -> Perhaps<ClockCommand> {
+        self.playhead.update_from_pulse(pulse);
+        Ok(None)
+    }
 
-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() }
+    #[command(SetBpm = "bpm")]
+    fn set_bpm (&mut self, bpm: f64) -> Perhaps<ClockCommand> {
+        Ok(Some(ClockCommand::SetBpm { bpm: self.timebase().bpm.set(bpm) }))
+    }
+
+    #[command(SetQuant = "quant")]
+    fn set_quant (&mut self, quant: f64) -> Perhaps<ClockCommand> {
+        Ok(Some(ClockCommand::SetQuant { quant: self.quant.set(quant) }))
+    }
+
+    #[command(SetSync = "sync")]
+    fn set_sync (&mut self, sync: f64) -> Perhaps<ClockCommand> {
+        Ok(Some(ClockCommand::SetSync { sync: self.sync.set(sync) }))
+    }
+
+    #[command(Play = "play")]
+    fn play (&mut self, position: Option<u32>) -> Perhaps<ClockCommand> {
+        self.play_from(position)?;
+        Ok(None) /* TODO Some(Pause(previousPosition)) */
+    }
+
+    #[command(Pause = "pause")]
+    fn pause (&mut self, position: Option<u32>) -> Perhaps<ClockCommand> {
+        self.pause_at(position)?;
+        Ok(None)
+    }
+
+    #[command(TogglePlayback = "toggle")]
+    fn toggle (&mut self, position: u32) -> Perhaps<ClockCommand> {
+        Ok(if self.is_rolling() {
+            self.pause_at(Some(position))?; None
+        } else {
+            self.play_from(Some(position))?; None
+        })
+    }
 }
 
 /// The source of time.
@@ -86,6 +111,23 @@ pub trait HasClock: AsRef<Clock> + AsMut<Clock> {
     #[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 ClockCommand {
+    fn act (&self, state: &mut T) -> Perhaps<Self> {
+        self.act(state.clock_mut()) // awesome
+    }
+}
+
 /// Quantization setting for launching clips
 ///
 /// ```
@@ -183,35 +225,6 @@ impl Quantize {
     }
 }
 
-/// Define and implement a unit of time
-#[macro_export] macro_rules! impl_time_unit {
-    ($T:ident) => {
-        impl Gettable<f64> for $T {
-            fn get (&self) -> f64 { self.0.load(Relaxed) }
-        }
-        impl InteriorMutable<f64> for $T {
-            fn set (&self, value: f64) -> f64 {
-                let old = self.get();
-                self.0.store(value, Relaxed);
-                old
-            }
-        }
-        impl TimeUnit for $T {}
-        impl_op!($T, Add, add, |a, b|{a + b});
-        impl_op!($T, Sub, sub, |a, b|{a - b});
-        impl_op!($T, Mul, mul, |a, b|{a * b});
-        impl_op!($T, Div, div, |a, b|{a / b});
-        impl_op!($T, Rem, rem, |a, b|{a % b});
-        impl From<f64>   for $T    { fn from (value: f64)   -> Self { Self(value.into()) } }
-        impl From<usize> for $T    { fn from (value: usize) -> Self { Self((value as f64).into()) } }
-        impl From<$T>    for f64   { fn from (value: $T)    -> Self { value.get() } }
-        impl From<$T>    for usize { fn from (value: $T)    -> Self { value.get() as usize } }
-        impl From<&$T>   for f64   { fn from (value: &$T)   -> Self { value.get() } }
-        impl From<&$T>   for usize { fn from (value: &$T)   -> Self { value.get() as usize } }
-        impl Clone for $T { fn clone (&self) -> Self { Self(self.get().into()) } }
-    }
-}
-
 impl std::fmt::Debug for Clock {
     fn fmt (&self, f: &mut Formatter<'_>) -> std::result::Result<(), std::fmt::Error> {
         f.debug_struct("Clock")
@@ -397,14 +410,38 @@ impl Clock {
     }
 }
 
-impl<T: HasClock> Act<T> for ClockCommand {
-    fn act (&self, state: &mut T) -> Perhaps<Self> {
-        self.act(state.clock_mut()) // awesome
+impl_has!(Clock: |self: Track|self.sequencer.clock);
+impl_default!(Timebase: Self::new(48000f64, 150f64, DEFAULT_PPQ));
+
+/// Define and implement a unit of time
+#[macro_export] macro_rules! impl_time_unit {
+    ($T:ident) => {
+        impl Gettable<f64> for $T {
+            fn get (&self) -> f64 { self.0.load(Relaxed) }
+        }
+        impl InteriorMutable<f64> for $T {
+            fn set (&self, value: f64) -> f64 {
+                let old = self.get();
+                self.0.store(value, Relaxed);
+                old
+            }
+        }
+        impl TimeUnit for $T {}
+        impl_op!($T, Add, add, |a, b|{a + b});
+        impl_op!($T, Sub, sub, |a, b|{a - b});
+        impl_op!($T, Mul, mul, |a, b|{a * b});
+        impl_op!($T, Div, div, |a, b|{a / b});
+        impl_op!($T, Rem, rem, |a, b|{a % b});
+        impl From<f64>   for $T    { fn from (value: f64)   -> Self { Self(value.into()) } }
+        impl From<usize> for $T    { fn from (value: usize) -> Self { Self((value as f64).into()) } }
+        impl From<$T>    for f64   { fn from (value: $T)    -> Self { value.get() } }
+        impl From<$T>    for usize { fn from (value: $T)    -> Self { value.get() as usize } }
+        impl From<&$T>   for f64   { fn from (value: &$T)   -> Self { value.get() } }
+        impl From<&$T>   for usize { fn from (value: &$T)   -> Self { value.get() as usize } }
+        impl Clone for $T { fn clone (&self) -> Self { Self(self.get().into()) } }
     }
 }
 
-#[cfg(feature = "clock")] impl_has!(Clock: |self: Track|self.sequencer.clock);
-impl_default!(Timebase: Self::new(48000f64, 150f64, DEFAULT_PPQ));
 impl_time_unit!(SampleCount);
 impl_time_unit!(SampleRate);
 impl_time_unit!(Microsecond);
diff --git a/src/device/editor.rs b/src/device/editor.rs
index 44b50020..27354cfe 100644
--- a/src/device/editor.rs
+++ b/src/device/editor.rs
@@ -56,29 +56,69 @@ impl App {
     }
 }
 
-def_command!(MidiEditCommand: |editor: MidiEditor| {
-    Show { clip: Option<Arc<RwLock<MidiClip>>> } => {
-        editor.set_clip(clip.as_ref()); editor.redraw(); Ok(None) },
-    DeleteNote => {
-        editor.redraw(); todo!() },
-    AppendNote    { advance: bool } => {
-        editor.put_note(*advance); editor.redraw(); Ok(None) },
-    SetNotePos    { pos:    usize } => {
-        editor.set_note_pos((*pos).min(127)); editor.redraw(); Ok(None) },
-    SetNoteLen    { len:    usize } => {
-        editor.set_note_len(*len); editor.redraw(); Ok(None) },
-    SetNoteScroll { scroll: usize } => {
-        editor.set_note_lo((*scroll).min(127)); editor.redraw(); Ok(None) },
-    SetTimePos    { pos:    usize } => {
-        editor.set_time_pos(*pos); editor.redraw(); Ok(None) },
-    SetTimeScroll { scroll: usize } => {
-        editor.set_time_start(*scroll); editor.redraw(); Ok(None) },
-    SetTimeZoom   { zoom:   usize } => {
-        editor.set_time_zoom(*zoom); editor.redraw(); Ok(None) },
-    SetTimeLock   { lock:   bool  } => {
-        editor.set_time_lock(*lock); editor.redraw(); Ok(None) },
+#[tek_proc::commands(MidiEditCommand = "edit")]
+impl MidiEditor {
+    #[command(Show = "show")]
+    fn show (&mut self, clip: Option<Arc<RwLock<MidiClip>>>) -> Perhaps<MidiEditCommand> {
+        self.set_clip(clip.as_ref());
+        self.redraw();
+        Ok(None)
+    }
+    #[command(DeleteNote = "delete")]
+    fn note_delete (&mut self) -> Perhaps<MidiEditCommand> {
+        self.redraw();
+        todo!()
+    }
+    #[command(AppendNote = "append")]
+    fn note_append (&mut self, advance: bool) -> Perhaps<MidiEditCommand> {
+        self.put_note(advance);
+        self.redraw();
+        Ok(None)
+    }
+    #[command(SetNotePos = "note-pos")]
+    fn note_set_pos (&mut self, pos: usize) -> Perhaps<MidiEditCommand> {
+        self.set_note_pos((pos).min(127));
+        self.redraw();
+        Ok(None)
+    }
+    #[command(SetNoteLen = "note-len")]
+    fn note_set_len (&mut self, len: usize) -> Perhaps<MidiEditCommand> {
+        self.set_note_len(len);
+        self.redraw();
+        Ok(None)
+    }
+    #[command(SetNoteScroll = "note-scroll")]
+    fn note_set_scroll (&mut self, scroll: usize) -> Perhaps<MidiEditCommand> {
+        self.set_note_lo((scroll).min(127));
+        self.redraw();
+        Ok(None)
+    }
+    #[command(SetTimePos = "time-pos")]
+    fn time_set_pos (&mut self, pos: usize) -> Perhaps<MidiEditCommand> {
+        self.set_time_pos(pos);
+        self.redraw();
+        Ok(None)
+    }
+    #[command(SetTimeScroll = "time-scroll")]
+    fn time_set_scroll (&mut self, scroll: usize) -> Perhaps<MidiEditCommand> {
+        self.set_time_start(scroll);
+        self.redraw();
+        Ok(None)
+    }
+    #[command(SetTimeZoom = "time-zoom")]
+    fn time_set_zoom (&mut self, zoom: usize) -> Perhaps<MidiEditCommand> {
+        self.set_time_zoom(zoom);
+        self.redraw();
+        Ok(None)
+    }
+    #[command(SetTimeLock = "time-lock")]
+    fn time_set_lock (&mut self, lock: bool) -> Perhaps<MidiEditCommand> {
+        self.set_time_lock(lock);
+        self.redraw();
+        Ok(None)
+    }
     // TODO: 1-9 seek markers that by default start every 8th of the clip
-});
+}
 
 /// Contains state for viewing and editing a clip.
 ///
diff --git a/src/device/sampler.rs b/src/device/sampler.rs
index 7da83c1d..206a8efa 100644
--- a/src/device/sampler.rs
+++ b/src/device/sampler.rs
@@ -8,52 +8,61 @@ pub(crate) use symphonia::{
     },
 };
 
-def_command!(SamplerCommand: |sampler: Sampler| {
-    RecordToggle { slot: usize } => {
-        let slot = *slot;
-        let recording = sampler.recording.as_ref().map(|x|x.0);
-        let _ = Self::RecordFinish.act(sampler)?;
+#[tek_proc::commands(SamplerCommand = "sampler")]
+impl Sampler {
+
+    #[command(RecordToggle = "rec-toggle")]
+    fn record_toggle (&mut self, slot: usize) -> Perhaps<SamplerCommand> {
+        let recording = self.recording.as_ref().map(|x|x.0);
+        let _ = SamplerCommand::RecordFinish.act(self)?;
         // autoslice: continue recording at next slot
         if recording != Some(slot) {
-            Self::RecordBegin { slot }.act(sampler)
+            SamplerCommand::RecordBegin { slot }.act(self)
         } else {
             Ok(None)
         }
-    },
-    RecordBegin { slot: usize } => {
-        let slot = *slot;
-        sampler.recording = Some((
+    }
+
+    #[command(RecordBegin = "rec-begin")]
+    fn record_begin (&mut self, slot: usize) -> Perhaps<SamplerCommand> {
+        self.recording = Some((
             slot,
             Some(Arc::new(RwLock::new(Sample::new(
-                "Sample", 0, 0, vec![vec![];sampler.audio_ins.len()]
+                "Sample", 0, 0, vec![vec![];self.audio_ins.len()]
             ))))
         ));
         Ok(None)
-    },
-    RecordFinish => {
-        let _prev_sample = sampler.recording.as_mut().map(|(index, sample)|{
-            std::mem::swap(sample, &mut sampler.samples.0[*index]);
+    }
+
+    #[command(RecordFinish = "rec-finish")]
+    fn record_finish (&mut self) -> Perhaps<SamplerCommand> {
+        let _prev_sample = self.recording.as_mut().map(|(index, sample)|{
+            std::mem::swap(sample, &mut self.samples.0[*index]);
             sample
         }); // TODO: undo
         Ok(None)
-    },
-    RecordCancel => {
-        sampler.recording = None;
+    }
+
+    #[command(RecordCancel = "rec-cancel")]
+    fn record_cancel (&mut self) -> Perhaps<SamplerCommand> {
+        self.recording = None;
         Ok(None)
-    },
-    PlaySample { slot: usize } => {
-        let slot = *slot;
-        if let Some(ref sample) = sampler.samples.0[slot] {
-            sampler.voices.write().unwrap().push(Sample::play(sample, 0, &u7::from(128)));
+    }
+
+    #[command(PlaySample = "sample-play")]
+    fn sample_play (&mut self, slot: usize) -> Perhaps<SamplerCommand> {
+        if let Some(ref sample) = self.samples.0[slot] {
+            self.voices.write().unwrap().push(Sample::play(sample, 0, &u7::from(128)));
         }
         Ok(None)
-    },
-    StopSample { slot: usize } => {
-        let _slot = *slot;
+    }
+
+    #[command(StopSample = "sample-stop")]
+    fn sample_stop (&mut self, slot: usize) -> Perhaps<SamplerCommand> {
         todo!();
         //Ok(None)
-    },
-});
+    }
+}
 
 /// Plays [Voice]s from [Sample]s.
 /// 
diff --git a/src/tek.rs b/src/tek.rs
index f0f7fedb..5bac9752 100644
--- a/src/tek.rs
+++ b/src/tek.rs
@@ -877,58 +877,14 @@ pub use self::bind::*;
 mod bind {
     use crate::*;
 
-    /// Define an enum containing commands, and implement [Command] trait for over given `State`.
-    #[macro_export] macro_rules! def_command (
-        ($Command:ident: |$state:ident: $State:ty| {
-            // FIXME: support attrs (docstrings)
-            $($Variant:ident$({$($arg:ident:$Arg:ty),+ $(,)?})?=>$body:expr),* $(,)?
-        })=>{
-            #[derive(Debug)] pub enum $Command {
-                // FIXME: support attrs (docstrings)
-                $($Variant $({ $($arg: $Arg),* })?),*
-            }
-            impl ::tengri::dizzle::Act<$State> for $Command {
-                fn act (&self, $state: &mut $State) -> Perhaps<Self> {
-                    match self {
-                        $(Self::$Variant $({ $($arg),* })? => $body,)*
-                        _ => unimplemented!("Act<{}>: {self:?}", stringify!($State)),
-                    }
-                }
-            }
-        });
-
-    pub fn swap_value <T: Clone + PartialEq, U> (
-        target: &mut T, value: &T, returned: impl Fn(T)->U
-    ) -> Perhaps<U> {
-        if *target == *value {
-            Ok(None)
-        } else {
-            let mut value = value.clone();
-            std::mem::swap(target, &mut value);
-            Ok(Some(returned(value)))
-        }
-    }
-
-    pub fn toggle_bool <U> (
-        target: &mut bool, value: &Option<bool>, returned: impl Fn(Option<bool>)->U
-    ) -> Perhaps<U> {
-        let mut value = value.unwrap_or(!*target);
-        if value == *target {
-            Ok(None)
-        } else {
-            std::mem::swap(target, &mut value);
-            Ok(Some(returned(Some(value))))
-        }
-    }
-
     tui_keys!(self: App, input {
-        let commands = tek_commands_collect(self, input)?;
-        let results = tek_commands_execute(self, commands)?;
+        let commands = collect_commands(self, input)?;
+        let results = execute_commands(self, commands)?;
         self.history.extend(results.into_iter());
         Ok(())
     });
 
-    fn tek_commands_collect (app: &App, input: &TuiEvent)
+    fn collect_commands (app: &App, input: &TuiEvent)
         -> Usually<Vec<AppCommand>>
     {
         let mut commands = vec![];
@@ -953,7 +909,7 @@ mod bind {
         Ok(commands)
     }
 
-    fn tek_commands_execute (app: &mut App, commands: Vec<AppCommand>)
+    fn execute_commands (app: &mut App, commands: Vec<AppCommand>)
         -> Usually<Vec<(AppCommand, Option<AppCommand>)>>
     {
         let mut history = vec![];