diff --git a/REUSE.toml b/REUSE.toml
index 5a07fdd..d292269 100644
--- a/REUSE.toml
+++ b/REUSE.toml
@@ -10,6 +10,6 @@ SPDX-FileCopyrightText = "2025 Kalle Fagerberg"
 SPDX-License-Identifier = "MIT"
 
 [[annotations]]
-path = ["**/moon.mod", "example/moon.work", "**/moon.pkg.json", "**/moon.pkg"]
+path = ["**/moon.mod", "**/moon.work", "**/moon.pkg.json", "**/moon.pkg"]
 SPDX-FileCopyrightText = "2025 Kalle Fagerberg"
 SPDX-License-Identifier = "CC0-1.0"
diff --git a/example/audio/main.mbt b/example/audio/main.mbt
index f010c7b..4f083cc 100644
--- a/example/audio/main.mbt
+++ b/example/audio/main.mbt
@@ -7,7 +7,8 @@ fn main {
 /// boot is only called once, after all the memory is initialized.
 pub fn boot() -> Unit {
   @audio.out.add_file(b"pickupCoin") |> ignore
-  @audio.out.add_gain(0.5).next().add_sine(@audio.A4, 1) |> ignore
+  let gain = @audio.out.add_gain(0.5)
+  gain.add_sine(@audio.A4, 1) |> ignore
 }
 
 ///|
diff --git a/example/audio/moon.work b/example/audio/moon.work
new file mode 100644
index 0000000..5edbb9a
--- /dev/null
+++ b/example/audio/moon.work
@@ -0,0 +1,4 @@
+members = [
+  ".",
+  "../..",
+]
diff --git a/example/font/moon.work b/example/font/moon.work
new file mode 100644
index 0000000..5edbb9a
--- /dev/null
+++ b/example/font/moon.work
@@ -0,0 +1,4 @@
+members = [
+  ".",
+  "../..",
+]
diff --git a/example/image/moon.work b/example/image/moon.work
new file mode 100644
index 0000000..5edbb9a
--- /dev/null
+++ b/example/image/moon.work
@@ -0,0 +1,4 @@
+members = [
+  ".",
+  "../..",
+]
diff --git a/example/input/moon.work b/example/input/moon.work
new file mode 100644
index 0000000..5edbb9a
--- /dev/null
+++ b/example/input/moon.work
@@ -0,0 +1,4 @@
+members = [
+  ".",
+  "../..",
+]
diff --git a/example/moon.work b/example/moon.work
deleted file mode 100644
index 431a1f5..0000000
--- a/example/moon.work
+++ /dev/null
@@ -1,3 +0,0 @@
-members = [
-  "..",
-]
diff --git a/example/random/moon.work b/example/random/moon.work
new file mode 100644
index 0000000..5edbb9a
--- /dev/null
+++ b/example/random/moon.work
@@ -0,0 +1,4 @@
+members = [
+  ".",
+  "../..",
+]
diff --git a/example/scores/moon.work b/example/scores/moon.work
new file mode 100644
index 0000000..5edbb9a
--- /dev/null
+++ b/example/scores/moon.work
@@ -0,0 +1,4 @@
+members = [
+  ".",
+  "../..",
+]
diff --git a/example/shapes/moon.work b/example/shapes/moon.work
new file mode 100644
index 0000000..5edbb9a
--- /dev/null
+++ b/example/shapes/moon.work
@@ -0,0 +1,4 @@
+members = [
+  ".",
+  "../..",
+]
diff --git a/src/audio/node.mbt b/src/audio/node.mbt
index 6430c46..e7eef22 100644
--- a/src/audio/node.mbt
+++ b/src/audio/node.mbt
@@ -1,497 +1,209 @@
 ///|
-#valtype
-struct Node {
-  id : UInt
-} derive(Eq, Compare, Hash)
-
-///|
-pub trait Marker {
-  fn next(Self) -> Node
-}
-
-///|
-/// The output audio node. Mixes all inputs and plays them on the device's speaker.
-pub let out : Node = Node::{ id: 0 }
-
-///|
-/// A marker for a specific node type. See `Node::add_sine`.
-pub struct Sine(Node)
-
-///|
-/// Get the next node for applying more effects.
-#inline
-pub impl Marker for Sine with fn next(self : Sine) -> Node {
-  self.0
-}
-
-///|
-/// A marker for a specific node type. See `Node::add_mix`.
-struct Mix(Node)
-
-///|
-/// Get the next node for applying more effects.
-#inline
-pub impl Marker for Mix with fn next(self : Mix) -> Node {
-  self.0
-}
-
-///|
-/// A marker for a specific node type. See `Node::add_all_for_one`.
-struct AllForOne(Node)
-
-///|
-/// Get the next node for applying more effects.
-#inline
-pub impl Marker for AllForOne with fn next(self : AllForOne) -> Node {
-  self.0
-}
-
-///|
-/// A marker for a specific node type. See `Node::add_gain`.
-struct Gain(Node)
-
-///|
-/// Get the next node for applying more effects.
-#inline
-pub impl Marker for Gain with fn next(self : Gain) -> Node {
-  self.0
-}
-
-///|
-/// A marker for a specific node type. See `Node::add_loop`.
-struct Loop(Node)
-
-///|
-/// Get the next node for applying more effects.
-#inline
-pub impl Marker for Loop with fn next(self : Loop) -> Node {
-  self.0
-}
-
-///|
-/// A marker for a specific node type. See `Node::add_concat`.
-struct Concat(Node)
-
-///|
-/// Get the next node for applying more effects.
-#inline
-pub impl Marker for Concat with fn next(self : Concat) -> Node {
-  self.0
-}
-
-///|
-/// A marker for a specific node type. See `Node::add_pan`.
-struct Pan(Node)
-
-///|
-/// Get the next node for applying more effects.
-#inline
-pub impl Marker for Pan with fn next(self : Pan) -> Node {
-  self.0
-}
-
-///|
-/// A marker for a specific node type. See `Node::add_mute`.
-struct Mute(Node)
-
-///|
-/// Get the next node for applying more effects.
-#inline
-pub impl Marker for Mute with fn next(self : Mute) -> Node {
-  self.0
-}
-
-///|
-/// A marker for a specific node type. See `Node::add_pause`.
-struct Pause(Node)
-
-///|
-/// Get the next node for applying more effects.
-#inline
-pub impl Marker for Pause with fn next(self : Pause) -> Node {
-  self.0
-}
-
-///|
-/// A marker for a specific node type. See `Node::add_track_position`.
-struct TrackPosition(Node)
-
-///|
-/// Get the next node for applying more effects.
-#inline
-pub impl Marker for TrackPosition with fn next(self : TrackPosition) -> Node {
-  self.0
-}
-
-///|
-/// A marker for a specific node type. See `Node::add_low_pass`.
-struct LowPass(Node)
-
-///|
-/// Get the next node for applying more effects.
-#inline
-pub impl Marker for LowPass with fn next(self : LowPass) -> Node {
-  self.0
-}
-
-///|
-/// A marker for a specific node type. See `Node::add_high_pass`.
-struct HighPass(Node)
-
-///|
-/// Get the next node for applying more effects.
-#inline
-pub impl Marker for HighPass with fn next(self : HighPass) -> Node {
-  self.0
-}
-
-///|
-/// A marker for a specific node type. See `Node::add_take_left`.
-struct TakeLeft(Node)
-
-///|
-/// Get the next node for applying more effects.
-#inline
-pub impl Marker for TakeLeft with fn next(self : TakeLeft) -> Node {
-  self.0
-}
-
-///|
-/// A marker for a specific node type. See `Node::add_take_right`.
-struct TakeRight(Node)
-
-///|
-/// Get the next node for applying more effects.
-#inline
-pub impl Marker for TakeRight with fn next(self : TakeRight) -> Node {
-  self.0
-}
-
-///|
-/// A marker for a specific node type. See `Node::add_swap`.
-struct Swap(Node)
-
-///|
-/// Get the next node for applying more effects.
-#inline
-pub impl Marker for Swap with fn next(self : Swap) -> Node {
-  self.0
-}
-
-///|
-/// A marker for a specific node type. See `Node::add_clip`.
-struct Clip(Node)
-
-///|
-/// Get the next node for applying more effects.
-#inline
-pub impl Marker for Clip with fn next(self : Clip) -> Node {
-  self.0
-}
-
-///|
-/// A marker for a specific node type. See `Node::add_square`.
-struct Square(Node)
-
-///|
-/// Get the next node for applying more effects.
-#inline
-pub impl Marker for Square with fn next(self : Square) -> Node {
-  self.0
-}
-
-///|
-/// A marker for a specific node type. See `Node::add_sawtooth`.
-struct Sawtooth(Node)
-
-///|
-/// Get the next node for applying more effects.
-#inline
-pub impl Marker for Sawtooth with fn next(self : Sawtooth) -> Node {
-  self.0
-}
-
-///|
-/// A marker for a specific node type. See `Node::add_triangle`.
-struct Triangle(Node)
-
-///|
-/// Get the next node for applying more effects.
-#inline
-pub impl Marker for Triangle with fn next(self : Triangle) -> Node {
-  self.0
-}
-
-///|
-/// A marker for a specific node type. See `Node::add_noise`.
-struct Noise(Node)
-
-///|
-/// Get the next node for applying more effects.
-#inline
-pub impl Marker for Noise with fn next(self : Noise) -> Node {
-  self.0
-}
-
-///|
-/// A marker for a specific node type. See `Node::add_empty`.
-struct Empty(Node)
-
-///|
-/// Get the next node for applying more effects.
-#inline
-pub impl Marker for Empty with fn next(self : Empty) -> Node {
-  self.0
-}
-
-///|
-/// A marker for a specific node type. See `Node::add_zero`.
-struct Zero(Node)
-
-///|
-/// Get the next node for applying more effects.
-#inline
-pub impl Marker for Zero with fn next(self : Zero) -> Node {
-  self.0
-}
-
-///|
-/// A marker for a specific node type. See `Node::add_file`.
-struct File(Node)
-
-///|
-/// Get the next node for applying more effects.
-#inline
-pub impl Marker for File with fn next(self : File) -> Node {
-  self.0
+pub trait SourceNode {
+  fn id(Self) -> UInt
+  fn reset(Self) -> Unit = _
+}
+
+///|
+pub trait Node {
+  fn id(Self) -> UInt
+  fn add_sine(Self, freq : Hz, phase : Float) -> Sine = _
+  fn add_square(Self, freq : Hz, phase : Float) -> Square = _
+  fn add_sawtooth(Self, freq : Hz, phase : Float) -> Sawtooth = _
+  fn add_triangle(Self, freq : Hz, phase : Float) -> Triangle = _
+  fn add_noise(Self, seed : Int) -> Noise = _
+  fn add_empty(Self) -> Empty = _
+  fn add_zero(Self) -> Zero = _
+  fn add_file(Self, path : @firefly.Utf8View) -> File = _
+  fn add_mix(Self) -> Mix = _
+  fn add_all_for_one(Self) -> AllForOne = _
+  fn add_gain(Self, level : Float) -> Gain = _
+  fn add_loop(Self) -> Loop = _
+  fn add_concat(Self) -> Concat = _
+  fn add_pan(Self, level : Float) -> Pan = _
+  fn add_mute(Self) -> Mute = _
+  fn add_pause(Self) -> Pause = _
+  fn add_track_position(Self) -> TrackPosition = _
+  fn add_low_pass(Self, freq : Hz, q : Float) -> LowPass = _
+  fn add_high_pass(Self, freq : Hz, q : Float) -> HighPass = _
+  fn add_take_left(Self) -> TakeLeft = _
+  fn add_take_right(Self) -> TakeRight = _
+  fn add_swap(Self) -> Swap = _
+  fn add_clip(Self, low : Float, high : Float) -> Clip = _
+  fn reset(Self) -> Unit = _
+  fn reset_all(Self) -> Unit = _
+  fn clear(Self) -> Unit = _
 }
 
 ///|
 /// Add sine wave oscillator source (`∿`).
-pub fn Node::add_sine(self : Node, freq : Hz, phase : Float) -> Sine {
-  Sine(Node::{ id: @ffi.audio_add_sine(self.id, freq, phase) })
+impl Node with fn add_sine(self, freq : Hz, phase : Float) -> Sine {
+  Sine::{ id: @ffi.audio_add_sine(self.id(), freq, phase) }
 }
 
 ///|
 /// Add square wave oscillator source (`⎍`).
-pub fn Node::add_square(self : Node, freq : Hz, phase : Float) -> Square {
-  Square(Node::{ id: @ffi.audio_add_square(self.id, freq, phase) })
+impl Node with fn add_square(self, freq : Hz, phase : Float) -> Square {
+  Square::{ id: @ffi.audio_add_square(self.id(), freq, phase) }
 }
 
 ///|
 /// Add sawtooth wave oscillator source (`╱│`).
-pub fn Node::add_sawtooth(self : Node, freq : Hz, phase : Float) -> Sawtooth {
-  Sawtooth(Node::{ id: @ffi.audio_add_sawtooth(self.id, freq, phase) })
+impl Node with fn add_sawtooth(self, freq : Hz, phase : Float) -> Sawtooth {
+  Sawtooth::{ id: @ffi.audio_add_sawtooth(self.id(), freq, phase) }
 }
 
 ///|
 /// Add triangle wave oscillator source (`╱╲`).
-pub fn Node::add_triangle(self : Node, freq : Hz, phase : Float) -> Triangle {
-  Triangle(Node::{ id: @ffi.audio_add_triangle(self.id, freq, phase) })
+impl Node with fn add_triangle(self, freq : Hz, phase : Float) -> Triangle {
+  Triangle::{ id: @ffi.audio_add_triangle(self.id(), freq, phase) }
 }
 
 ///|
 /// Add white noise source (amplitude on each tick is random).
-pub fn Node::add_noise(self : Node, seed : Int) -> Noise {
-  Noise(Node::{ id: @ffi.audio_add_noise(self.id, seed) })
+impl Node with fn add_noise(self, seed : Int) -> Noise {
+  Noise::{ id: @ffi.audio_add_noise(self.id(), seed) }
 }
 
 ///|
 /// Add always stopped source.
-pub fn Node::add_empty(self : Node) -> Empty {
-  Empty(Node::{ id: @ffi.audio_add_empty(self.id) })
+impl Node with fn add_empty(self) -> Empty {
+  Empty::{ id: @ffi.audio_add_empty(self.id()) }
 }
 
 ///|
 /// Add silent source producing zeros.
-pub fn Node::add_zero(self : Node) -> Zero {
-  Zero(Node::{ id: @ffi.audio_add_zero(self.id) })
+impl Node with fn add_zero(self) -> Zero {
+  Zero::{ id: @ffi.audio_add_zero(self.id()) }
 }
 
 ///|
 /// Add source playing audio from a file.
-pub fn Node::add_file(self : Node, path : @firefly.Utf8View) -> File {
-  let file = File(Node::{
+impl Node with fn add_file(self, path : @firefly.Utf8View) -> File {
+  let file = File::{
     id: @ffi.audio_add_file(
-      self.id,
+      self.id(),
       @memory.bytesview_addr(path),
       @memory.bytesview_size(path),
     ),
-  })
+  }
   @memory.keep(path)
   file
 }
 
 ///|
 /// Add node simply mixing all inputs.
-pub fn Node::add_mix(self : Node) -> Mix {
-  Mix(Node::{ id: @ffi.audio_add_mix(self.id) })
+impl Node with fn add_mix(self) -> Mix {
+  Mix::{ id: @ffi.audio_add_mix(self.id()) }
 }
 
 ///|
 /// Add mixer node that stops if any of the sources stops.
-pub fn Node::add_all_for_one(self : Node) -> AllForOne {
-  AllForOne(Node::{ id: @ffi.audio_add_all_for_one(self.id) })
+impl Node with fn add_all_for_one(self) -> AllForOne {
+  AllForOne::{ id: @ffi.audio_add_all_for_one(self.id()) }
 }
 
 ///|
 /// Add gain control node.
-pub fn Node::add_gain(self : Node, level : Float) -> Gain {
-  Gain(Node::{ id: @ffi.audio_add_gain(self.id, level) })
+impl Node with fn add_gain(self, level : Float) -> Gain {
+  Gain::{ id: @ffi.audio_add_gain(self.id(), level) }
 }
 
 ///|
 /// Add a loop node that resets the input if it stops.
-pub fn Node::add_loop(self : Node) -> Loop {
-  Loop(Node::{ id: @ffi.audio_add_loop(self.id) })
+impl Node with fn add_loop(self) -> Loop {
+  Loop::{ id: @ffi.audio_add_loop(self.id()) }
 }
 
 ///|
 /// Add a node that plays the inputs one after the other, in the order as they added.
-pub fn Node::add_concat(self : Node) -> Concat {
-  Concat(Node::{ id: @ffi.audio_add_concat(self.id) })
+impl Node with fn add_concat(self) -> Concat {
+  Concat::{ id: @ffi.audio_add_concat(self.id()) }
 }
 
 ///|
 /// Add node panning the audio to the left (0.), right (1.), or something in between.
-pub fn Node::add_pan(self : Node, level : Float) -> Pan {
-  Pan(Node::{ id: @ffi.audio_add_pan(self.id, level) })
+impl Node with fn add_pan(self, level : Float) -> Pan {
+  Pan::{ id: @ffi.audio_add_pan(self.id(), level) }
 }
 
 ///|
 /// Add node that can be muted using modulation.
-pub fn Node::add_mute(self : Node) -> Mute {
-  Mute(Node::{ id: @ffi.audio_add_mute(self.id) })
+impl Node with fn add_mute(self) -> Mute {
+  Mute::{ id: @ffi.audio_add_mute(self.id()) }
 }
 
 ///|
 /// Add node that can be paused using modulation.
-pub fn Node::add_pause(self : Node) -> Pause {
-  Pause(Node::{ id: @ffi.audio_add_pause(self.id) })
+impl Node with fn add_pause(self) -> Pause {
+  Pause::{ id: @ffi.audio_add_pause(self.id()) }
 }
 
 ///|
 /// Add node tracking the elapsed playback time.
-pub fn Node::add_track_position(self : Node) -> TrackPosition {
-  TrackPosition(Node::{ id: @ffi.audio_add_track_position(self.id) })
+impl Node with fn add_track_position(self) -> TrackPosition {
+  TrackPosition::{ id: @ffi.audio_add_track_position(self.id()) }
 }
 
 ///|
 /// Add lowpass filter node.
-pub fn Node::add_low_pass(self : Node, freq : Hz, q : Float) -> LowPass {
-  LowPass(Node::{ id: @ffi.audio_add_low_pass(self.id, freq, q) })
+impl Node with fn add_low_pass(self, freq : Hz, q : Float) -> LowPass {
+  LowPass::{ id: @ffi.audio_add_low_pass(self.id(), freq, q) }
 }
 
 ///|
 /// Add highpass filter node.
-pub fn Node::add_high_pass(self : Node, freq : Hz, q : Float) -> HighPass {
-  HighPass(Node::{ id: @ffi.audio_add_high_pass(self.id, freq, q) })
+impl Node with fn add_high_pass(self, freq : Hz, q : Float) -> HighPass {
+  HighPass::{ id: @ffi.audio_add_high_pass(self.id(), freq, q) }
 }
 
 ///|
 /// Add node converting stereo to mono by taking the left channel.
-pub fn Node::add_take_left(self : Node) -> TakeLeft {
-  TakeLeft(Node::{ id: @ffi.audio_add_take_left(self.id) })
+impl Node with fn add_take_left(self) -> TakeLeft {
+  TakeLeft::{ id: @ffi.audio_add_take_left(self.id()) }
 }
 
 ///|
 /// Add node converting stereo to mono by taking the right channel.
-pub fn Node::add_take_right(self : Node) -> TakeRight {
-  TakeRight(Node::{ id: @ffi.audio_add_take_right(self.id) })
+impl Node with fn add_take_right(self) -> TakeRight {
+  TakeRight::{ id: @ffi.audio_add_take_right(self.id()) }
 }
 
 ///|
 /// Add node swapping left and right channels of the stereo input.
-pub fn Node::add_swap(self : Node) -> Swap {
-  Swap(Node::{ id: @ffi.audio_add_swap(self.id) })
+impl Node with fn add_swap(self) -> Swap {
+  Swap::{ id: @ffi.audio_add_swap(self.id()) }
 }
 
 ///|
 /// Add node clamping the input amplitude. Can be used for hard distortion.
-pub fn Node::add_clip(self : Node, low : Float, high : Float) -> Clip {
-  Clip(Node::{ id: @ffi.audio_add_clip(self.id, low, high) })
+impl Node with fn add_clip(self, low : Float, high : Float) -> Clip {
+  Clip::{ id: @ffi.audio_add_clip(self.id(), low, high) }
 }
 
 ///|
-/// Modulate oscillation frequency.
-pub fn[Mod : Modulator] Sine::modulate(self : Sine, mod : Mod) -> Unit {
-  mod.modulate(self.0.id, 0)
+/// Reset the node state to how it was when it was just added.
+impl SourceNode with fn reset(self) {
+  @ffi.audio_reset(self.id())
 }
 
 ///|
-/// Modulate oscillation frequency.
-pub fn[Mod : Modulator] Square::modulate(self : Square, mod : Mod) -> Unit {
-  mod.modulate(self.0.id, 0)
+/// Reset the node state to how it was when it was just added.
+impl Node with fn reset(self) {
+  @ffi.audio_reset(self.id())
 }
 
 ///|
-/// Modulate oscillation frequency.
-pub fn[Mod : Modulator] Sawtooth::modulate(self : Sawtooth, mod : Mod) -> Unit {
-  mod.modulate(self.0.id, 0)
+/// Reset the node and all child nodes to the state to how it was when they were just added.
+impl Node with fn reset_all(self) {
+  @ffi.audio_reset_all(self.id())
 }
 
 ///|
-/// Modulate oscillation frequency.
-pub fn[Mod : Modulator] Triangle::modulate(self : Triangle, mod : Mod) -> Unit {
-  mod.modulate(self.0.id, 0)
-}
-
-///|
-/// Modulate the gain level.
-pub fn[Mod : Modulator] Gain::modulate(self : Gain, mod : Mod) -> Unit {
-  mod.modulate(self.0.id, 0)
-}
-
-///|
-/// Modulate the pan value (from 0. to 1.: 0. is only left, 1. is only right).
-pub fn[Mod : Modulator] Pan::modulate(self : Pan, mod : Mod) -> Unit {
-  mod.modulate(self.0.id, 0)
-}
-
-///|
-/// Modulate the muted state.
+///  Remove all child nodes.
 ///
-/// Below 0.5 is muted, above is unmuted.
-pub fn[Mod : Modulator] Mute::modulate(self : Mute, mod : Mod) -> Unit {
-  mod.modulate(self.0.id, 0)
-}
-
-///|
-/// Modulate the paused state.
-///
-/// Below 0.5 is paused, above is playing.
-pub fn[Mod : Modulator] Pause::modulate(self : Pause, mod : Mod) -> Unit {
-  mod.modulate(self.0.id, 0)
-}
-
-///|
-/// Modulate the cut-off frequency.
-pub fn[Mod : Modulator] LowPass::modulate(self : LowPass, mod : Mod) -> Unit {
-  mod.modulate(self.0.id, 0)
-}
-
-///|
-/// Modulate the cut-off frequency.
-pub fn[Mod : Modulator] HighPass::modulate(self : HighPass, mod : Mod) -> Unit {
-  mod.modulate(self.0.id, 0)
-}
-
-///|
-/// Modulate the low cut amplitude and adjust the high amplitude to keep the gap.
-///
-/// In other words, the difference between low and high cut points will stay the same.
-pub fn[Mod : Modulator] Clip::modulate_both(self : Clip, mod : Mod) -> Unit {
-  mod.modulate(self.0.id, 0)
-}
-
-///|
-/// Modulate the low cut amplitude.
-pub fn[Mod : Modulator] Clip::modulate_low(self : Clip, mod : Mod) -> Unit {
-  mod.modulate(self.0.id, 1)
-}
-
-///|
-/// Modulate the high cut amplitude.
-pub fn[Mod : Modulator] Clip::modulate_high(self : Clip, mod : Mod) -> Unit {
-  mod.modulate(self.0.id, 2)
+/// After it is called, you should make sure to discard all references to the
+/// old child nodes.
+impl Node with fn clear(self) {
+  @ffi.audio_clear(self.id())
 }
diff --git a/src/audio/nodes.mbt b/src/audio/nodes.mbt
new file mode 100644
index 0000000..887dc1a
--- /dev/null
+++ b/src/audio/nodes.mbt
@@ -0,0 +1,236 @@
+///|
+struct Out {}
+
+///|
+pub impl Node for Out with fn id(_self) -> UInt {
+  return 0
+}
+
+///|
+/// The output audio node. Mixes all inputs and plays them on the device's speaker.
+pub let out : Out = Out::{  }
+
+///|
+/// A marker for a specific node type. See `Node::add_mix`.
+struct Mix {
+  id : UInt
+}
+
+///|
+pub impl Node for Mix with fn id(self) -> UInt {
+  return self.id
+}
+
+///|
+/// A marker for a specific node type. See `Node::add_all_for_one`.
+struct AllForOne {
+  id : UInt
+}
+
+///|
+pub impl Node for AllForOne with fn id(self) -> UInt {
+  return self.id
+}
+
+///|
+/// A marker for a specific node type. See `Node::add_gain`.
+struct Gain {
+  id : UInt
+}
+
+///|
+pub impl Node for Gain with fn id(self) -> UInt {
+  return self.id
+}
+
+///|
+/// A marker for a specific node type. See `Node::add_loop`.
+struct Loop {
+  id : UInt
+}
+
+///|
+pub impl Node for Loop with fn id(self) -> UInt {
+  return self.id
+}
+
+///|
+/// A marker for a specific node type. See `Node::add_concat`.
+struct Concat {
+  id : UInt
+}
+
+///|
+pub impl Node for Concat with fn id(self) -> UInt {
+  return self.id
+}
+
+///|
+/// A marker for a specific node type. See `Node::add_pan`.
+struct Pan {
+  id : UInt
+}
+
+///|
+pub impl Node for Pan with fn id(self) -> UInt {
+  return self.id
+}
+
+///|
+/// A marker for a specific node type. See `Node::add_mute`.
+struct Mute {
+  id : UInt
+}
+
+///|
+pub impl Node for Mute with fn id(self) -> UInt {
+  return self.id
+}
+
+///|
+/// A marker for a specific node type. See `Node::add_pause`.
+struct Pause {
+  id : UInt
+}
+
+///|
+pub impl Node for Pause with fn id(self) -> UInt {
+  return self.id
+}
+
+///|
+/// A marker for a specific node type. See `Node::add_track_position`.
+struct TrackPosition {
+  id : UInt
+}
+
+///|
+pub impl Node for TrackPosition with fn id(self) -> UInt {
+  return self.id
+}
+
+///|
+/// A marker for a specific node type. See `Node::add_low_pass`.
+struct LowPass {
+  id : UInt
+}
+
+///|
+pub impl Node for LowPass with fn id(self) -> UInt {
+  return self.id
+}
+
+///|
+/// A marker for a specific node type. See `Node::add_high_pass`.
+struct HighPass {
+  id : UInt
+}
+
+///|
+pub impl Node for HighPass with fn id(self) -> UInt {
+  return self.id
+}
+
+///|
+/// A marker for a specific node type. See `Node::add_take_left`.
+struct TakeLeft {
+  id : UInt
+}
+
+///|
+pub impl Node for TakeLeft with fn id(self) -> UInt {
+  return self.id
+}
+
+///|
+/// A marker for a specific node type. See `Node::add_take_right`.
+struct TakeRight {
+  id : UInt
+}
+
+///|
+pub impl Node for TakeRight with fn id(self) -> UInt {
+  return self.id
+}
+
+///|
+/// A marker for a specific node type. See `Node::add_swap`.
+struct Swap {
+  id : UInt
+}
+
+///|
+pub impl Node for Swap with fn id(self) -> UInt {
+  return self.id
+}
+
+///|
+/// A marker for a specific node type. See `Node::add_clip`.
+struct Clip {
+  id : UInt
+}
+
+///|
+pub impl Node for Clip with fn id(self) -> UInt {
+  return self.id
+}
+
+///|
+/// Modulate the gain level.
+pub fn[Mod : Modulator] Gain::modulate(self : Gain, mod : Mod) -> Unit {
+  mod.modulate(self.id(), 0)
+}
+
+///|
+/// Modulate the pan value (from 0. to 1.: 0. is only left, 1. is only right).
+pub fn[Mod : Modulator] Pan::modulate(self : Pan, mod : Mod) -> Unit {
+  mod.modulate(self.id(), 0)
+}
+
+///|
+/// Modulate the muted state.
+///
+/// Below 0.5 is muted, above is unmuted.
+pub fn[Mod : Modulator] Mute::modulate(self : Mute, mod : Mod) -> Unit {
+  mod.modulate(self.id(), 0)
+}
+
+///|
+/// Modulate the paused state.
+///
+/// Below 0.5 is paused, above is playing.
+pub fn[Mod : Modulator] Pause::modulate(self : Pause, mod : Mod) -> Unit {
+  mod.modulate(self.id(), 0)
+}
+
+///|
+/// Modulate the cut-off frequency.
+pub fn[Mod : Modulator] LowPass::modulate(self : LowPass, mod : Mod) -> Unit {
+  mod.modulate(self.id(), 0)
+}
+
+///|
+/// Modulate the cut-off frequency.
+pub fn[Mod : Modulator] HighPass::modulate(self : HighPass, mod : Mod) -> Unit {
+  mod.modulate(self.id(), 0)
+}
+
+///|
+/// Modulate the low cut amplitude and adjust the high amplitude to keep the gap.
+///
+/// In other words, the difference between low and high cut points will stay the same.
+pub fn[Mod : Modulator] Clip::modulate_both(self : Clip, mod : Mod) -> Unit {
+  mod.modulate(self.id(), 0)
+}
+
+///|
+/// Modulate the low cut amplitude.
+pub fn[Mod : Modulator] Clip::modulate_low(self : Clip, mod : Mod) -> Unit {
+  mod.modulate(self.id(), 1)
+}
+
+///|
+/// Modulate the high cut amplitude.
+pub fn[Mod : Modulator] Clip::modulate_high(self : Clip, mod : Mod) -> Unit {
+  mod.modulate(self.id(), 2)
+}
diff --git a/src/audio/source_nodes.mbt b/src/audio/source_nodes.mbt
new file mode 100644
index 0000000..a33f894
--- /dev/null
+++ b/src/audio/source_nodes.mbt
@@ -0,0 +1,111 @@
+///|
+/// A marker for a specific node type. See `Node::add_sine`.
+pub struct Sine {
+  id : UInt
+}
+
+///|
+pub impl SourceNode for Sine with fn id(self) -> UInt {
+  return self.id
+}
+
+///|
+/// A marker for a specific node type. See `Node::add_square`.
+struct Square {
+  id : UInt
+}
+
+///|
+pub impl SourceNode for Square with fn id(self) -> UInt {
+  return self.id
+}
+
+///|
+/// A marker for a specific node type. See `Node::add_sawtooth`.
+struct Sawtooth {
+  id : UInt
+}
+
+///|
+pub impl SourceNode for Sawtooth with fn id(self) -> UInt {
+  return self.id
+}
+
+///|
+/// A marker for a specific node type. See `Node::add_triangle`.
+struct Triangle {
+  id : UInt
+}
+
+///|
+pub impl SourceNode for Triangle with fn id(self) -> UInt {
+  return self.id
+}
+
+///|
+/// A marker for a specific node type. See `Node::add_noise`.
+struct Noise {
+  id : UInt
+}
+
+///|
+pub impl SourceNode for Noise with fn id(self) -> UInt {
+  return self.id
+}
+
+///|
+/// A marker for a specific node type. See `Node::add_empty`.
+struct Empty {
+  id : UInt
+}
+
+///|
+pub impl SourceNode for Empty with fn id(self) -> UInt {
+  return self.id
+}
+
+///|
+/// A marker for a specific node type. See `Node::add_zero`.
+struct Zero {
+  id : UInt
+}
+
+///|
+pub impl SourceNode for Zero with fn id(self) -> UInt {
+  return self.id
+}
+
+///|
+/// A marker for a specific node type. See `Node::add_file`.
+struct File {
+  id : UInt
+}
+
+///|
+pub impl SourceNode for File with fn id(self) -> UInt {
+  return self.id
+}
+
+///|
+/// Modulate oscillation frequency.
+pub fn[Mod : Modulator] Sine::modulate(self : Sine, mod : Mod) -> Unit {
+  mod.modulate(self.id(), 0)
+}
+
+///|
+/// Modulate oscillation frequency.
+pub fn[Mod : Modulator] Square::modulate(self : Square, mod : Mod) -> Unit {
+  mod.modulate(self.id(), 0)
+}
+
+///|
+/// Modulate oscillation frequency.
+pub fn[Mod : Modulator] Sawtooth::modulate(self : Sawtooth, mod : Mod) -> Unit {
+  mod.modulate(self.id(), 0)
+}
+
+///|
+/// Modulate oscillation frequency.
+pub fn[Mod : Modulator] Triangle::modulate(self : Triangle, mod : Mod) -> Unit {
+  mod.modulate(self.id(), 0)
+}
diff --git a/src/internal/ffi/audio.mbt b/src/internal/ffi/audio.mbt
index 99f199c..bf0260b 100644
--- a/src/internal/ffi/audio.mbt
+++ b/src/internal/ffi/audio.mbt
@@ -111,7 +111,7 @@ pub fn audio_reset_all(node_id : UInt) -> Unit = "audio" "reset_all"
 ///
 /// After it is called, you should make sure to discard all references to the
 /// old child nodes.
-pub fn audio_clear_node(node_id : UInt) -> Unit = "audio" "clear_node"
+pub fn audio_clear(node_id : UInt) -> Unit = "audio" "clear"
 
 ///|
 /// Linear (ramp up or down) envelope.