diff --git a/src/sound.rs b/src/apu.rs
similarity index 99%
rename from src/sound.rs
rename to src/apu.rs
index 8fbc680..19b4f45 100644
--- a/src/sound.rs
+++ b/src/apu.rs
@@ -17,7 +17,7 @@ const CHANNEL_COUNT: usize = 2;
 const SAMPLE_INCREMENT: u64 = SAMPLE_RATE as u64;
 
 #[derive(Default, Debug, Clone)]
-pub(crate) struct Sound {
+pub(crate) struct Apu {
     pub(crate) ctrl: SoundControl,
     /// Tone & Sweep
     pub(crate) ch1: Channel1,
@@ -38,7 +38,7 @@ pub(crate) struct Sound {
     buffer: AudioBuffer<(f32, f32)>,
 }
 
-impl Sound {
+impl Apu {
     pub(crate) fn clock(&mut self, div: u16) {
         use FrameSequencerState::*;
         self.sample_counter += SAMPLE_INCREMENT;
@@ -257,7 +257,7 @@ pub(crate) struct SoundControl {
 
 impl SoundControl {
     /// 0xFF26 | NR52 - Sound On/Off
-    pub(crate) fn status(&self, snd: &Sound) -> u8 {
+    pub(crate) fn status(&self, snd: &Apu) -> u8 {
         (self.enabled as u8) << 7
             | (snd.ch4.enabled as u8) << 3
             | (snd.ch3.enabled as u8) << 2
diff --git a/src/sound/gen.rs b/src/apu/gen.rs
similarity index 100%
rename from src/sound/gen.rs
rename to src/apu/gen.rs
diff --git a/src/sound/types.rs b/src/apu/types.rs
similarity index 100%
rename from src/sound/types.rs
rename to src/apu/types.rs
diff --git a/src/bus.rs b/src/bus.rs
index dd82ffd..7f99a55 100644
--- a/src/bus.rs
+++ b/src/bus.rs
@@ -1,11 +1,11 @@
+use crate::apu::gen::AudioSender;
+use crate::apu::Apu;
 use crate::cartridge::Cartridge;
 use crate::high_ram::HighRam;
 use crate::interrupt::{Interrupt, InterruptFlag};
 use crate::joypad::Joypad;
 use crate::ppu::{Ppu, PpuMode};
 use crate::serial::Serial;
-use crate::sound::gen::AudioSender;
-use crate::sound::Sound;
 use crate::timer::Timer;
 use crate::work_ram::{VariableWorkRam, WorkRam};
 use std::{fs::File, io::Read};
@@ -21,7 +21,7 @@ pub struct Bus {
     var_ram: VariableWorkRam,
     pub(crate) timer: Timer,
     int: Interrupt,
-    snd: Sound,
+    apu: Apu,
     high_ram: HighRam,
     serial: Serial,
     pub(crate) joypad: Joypad,
@@ -37,7 +37,7 @@ impl Default for Bus {
             var_ram: Default::default(),
             timer: Default::default(),
             int: Default::default(),
-            snd: Default::default(),
+            apu: Default::default(),
             high_ram: Default::default(),
             serial: Default::default(),
             joypad: Default::default(),
@@ -67,22 +67,22 @@ impl Bus {
         self.cartridge.as_ref()?.title()
     }
 
+    pub(crate) fn apu(&self) -> &Apu {
+        &self.apu
+    }
+
+    pub(crate) fn apu_mut(&mut self) -> &mut Apu {
+        &mut self.apu
+    }
+
     pub(crate) fn pass_audio_src(&mut self, sender: AudioSender<f32>) {
-        self.snd.set_audio_src(sender)
-    }
-
-    pub(crate) fn is_full(&self) -> bool {
-        self.snd.is_full()
-    }
-
-    pub(crate) fn flush_samples(&mut self) {
-        self.snd.flush_samples()
+        self.apu.set_audio_src(sender)
     }
 
     pub(crate) fn clock(&mut self) {
         self.ppu.clock();
         self.timer.clock();
-        self.snd.clock(self.timer.divider);
+        self.apu.clock(self.timer.divider);
         self.clock_dma();
     }
 
@@ -229,25 +229,25 @@ impl BusIo for Bus {
                     0x06 => self.timer.modulo,
                     0x07 => self.timer.ctrl.into(),
                     0x0F => self.interrupt_flag().into(),
-                    0x10 => self.snd.ch1.sweep.into(),
-                    0x11 => self.snd.ch1.duty(),
-                    0x12 => self.snd.ch1.envelope.into(),
-                    0x14 => self.snd.ch1.freq_hi(),
-                    0x16 => self.snd.ch2.duty(),
-                    0x17 => self.snd.ch2.envelope.into(),
-                    0x19 => self.snd.ch2.freq_hi(),
-                    0x1A => self.snd.ch3.enabled(),
-                    0x1B => self.snd.ch3.len(),
-                    0x1C => self.snd.ch3.volume(),
-                    0x1E => self.snd.ch3.freq_hi(),
-                    0x20 => self.snd.ch4.len(),
-                    0x21 => self.snd.ch4.envelope.into(),
-                    0x22 => self.snd.ch4.poly.into(),
-                    0x23 => self.snd.ch4.freq_data(),
-                    0x24 => self.snd.ctrl.channel.into(),
-                    0x25 => self.snd.ctrl.output.into(),
-                    0x26 => self.snd.ctrl.status(&self.snd),
-                    0x30..=0x3F => self.snd.ch3.wave_ram[addr as usize - 0xFF30],
+                    0x10 => self.apu.ch1.sweep.into(),
+                    0x11 => self.apu.ch1.duty(),
+                    0x12 => self.apu.ch1.envelope.into(),
+                    0x14 => self.apu.ch1.freq_hi(),
+                    0x16 => self.apu.ch2.duty(),
+                    0x17 => self.apu.ch2.envelope.into(),
+                    0x19 => self.apu.ch2.freq_hi(),
+                    0x1A => self.apu.ch3.enabled(),
+                    0x1B => self.apu.ch3.len(),
+                    0x1C => self.apu.ch3.volume(),
+                    0x1E => self.apu.ch3.freq_hi(),
+                    0x20 => self.apu.ch4.len(),
+                    0x21 => self.apu.ch4.envelope.into(),
+                    0x22 => self.apu.ch4.poly.into(),
+                    0x23 => self.apu.ch4.freq_data(),
+                    0x24 => self.apu.ctrl.channel.into(),
+                    0x25 => self.apu.ctrl.output.into(),
+                    0x26 => self.apu.ctrl.status(&self.apu),
+                    0x30..=0x3F => self.apu.ch3.wave_ram[addr as usize - 0xFF30],
                     0x40 => self.ppu.ctrl.into(),
                     0x41 => self.ppu.stat.into(),
                     0x42 => self.ppu.pos.scroll_y,
@@ -344,28 +344,28 @@ impl BusIo for Bus {
                     0x06 => self.timer.modulo = byte,
                     0x07 => self.timer.ctrl = byte.into(),
                     0x0F => self.set_interrupt_flag(byte),
-                    0x10 => self.snd.ch1.sweep = byte.into(),
-                    0x11 => self.snd.ch1.set_duty(byte),
-                    0x12 => self.snd.ch1.envelope = byte.into(),
-                    0x13 => self.snd.ch1.set_freq_lo(byte),
-                    0x14 => self.snd.ch1.set_freq_hi(byte),
-                    0x16 => self.snd.ch2.set_duty(byte),
-                    0x17 => self.snd.ch2.envelope = byte.into(),
-                    0x18 => self.snd.ch2.set_freq_lo(byte),
-                    0x19 => self.snd.ch2.set_freq_hi(byte),
-                    0x1A => self.snd.ch3.set_enabled(byte),
-                    0x1B => self.snd.ch3.set_len(byte),
-                    0x1C => self.snd.ch3.set_volume(byte),
-                    0x1D => self.snd.ch3.set_freq_lo(byte),
-                    0x1E => self.snd.ch3.set_freq_hi(byte),
-                    0x20 => self.snd.ch4.set_len(byte),
-                    0x21 => self.snd.ch4.envelope = byte.into(),
-                    0x22 => self.snd.ch4.poly = byte.into(),
-                    0x23 => self.snd.ch4.set_freq_data(byte),
-                    0x24 => self.snd.ctrl.channel = byte.into(),
-                    0x25 => self.snd.ctrl.output = byte.into(),
-                    0x26 => self.snd.ctrl.set_status(byte), // FIXME: Should we control which bytes are written to here?
-                    0x30..=0x3F => self.snd.ch3.wave_ram[addr as usize - 0xFF30] = byte,
+                    0x10 => self.apu.ch1.sweep = byte.into(),
+                    0x11 => self.apu.ch1.set_duty(byte),
+                    0x12 => self.apu.ch1.envelope = byte.into(),
+                    0x13 => self.apu.ch1.set_freq_lo(byte),
+                    0x14 => self.apu.ch1.set_freq_hi(byte),
+                    0x16 => self.apu.ch2.set_duty(byte),
+                    0x17 => self.apu.ch2.envelope = byte.into(),
+                    0x18 => self.apu.ch2.set_freq_lo(byte),
+                    0x19 => self.apu.ch2.set_freq_hi(byte),
+                    0x1A => self.apu.ch3.set_enabled(byte),
+                    0x1B => self.apu.ch3.set_len(byte),
+                    0x1C => self.apu.ch3.set_volume(byte),
+                    0x1D => self.apu.ch3.set_freq_lo(byte),
+                    0x1E => self.apu.ch3.set_freq_hi(byte),
+                    0x20 => self.apu.ch4.set_len(byte),
+                    0x21 => self.apu.ch4.envelope = byte.into(),
+                    0x22 => self.apu.ch4.poly = byte.into(),
+                    0x23 => self.apu.ch4.set_freq_data(byte),
+                    0x24 => self.apu.ctrl.channel = byte.into(),
+                    0x25 => self.apu.ctrl.output = byte.into(),
+                    0x26 => self.apu.ctrl.set_status(byte), // FIXME: Should we control which bytes are written to here?
+                    0x30..=0x3F => self.apu.ch3.wave_ram[addr as usize - 0xFF30] = byte,
                     0x40 => self.ppu.ctrl = byte.into(),
                     0x41 => self.ppu.stat.update(byte),
                     0x42 => self.ppu.pos.scroll_y = byte,
diff --git a/src/cpu.rs b/src/cpu.rs
index 21786d3..818b9d5 100644
--- a/src/cpu.rs
+++ b/src/cpu.rs
@@ -1,9 +1,9 @@
+use crate::apu::gen::AudioSender;
 use crate::bus::{Bus, BusIo};
 use crate::instruction::{Cycle, Instruction};
 use crate::interrupt::{InterruptEnable, InterruptFlag};
 use crate::joypad::Joypad;
 use crate::ppu::Ppu;
-use crate::sound::gen::AudioSender;
 use crate::timer::Timer;
 use bitfield::bitfield;
 use std::fmt::{Display, Formatter, Result as FmtResult};
@@ -128,11 +128,11 @@ impl Cpu {
         let mut elapsed = 0x00;
         let pending: u32 = cycles.into();
         while elapsed < pending {
-            if !self.bus.is_full() {
+            if !self.bus.apu().is_full() {
                 self.bus.clock();
                 elapsed += 1;
             } else {
-                self.bus.flush_samples();
+                self.bus.apu_mut().flush_samples();
             }
         }
 
diff --git a/src/lib.rs b/src/lib.rs
index 6506e5f..44dc4fa 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -1,10 +1,11 @@
+pub use apu::gen::AudioMPSC;
 pub use gui::Egui;
 pub use instruction::Cycle;
-pub use sound::gen::AudioMPSC;
 
 pub const GB_WIDTH: usize = 160;
 pub const GB_HEIGHT: usize = 144;
 
+mod apu;
 mod bus;
 mod cartridge;
 mod cpu;
@@ -16,6 +17,5 @@ mod interrupt;
 mod joypad;
 mod ppu;
 mod serial;
-mod sound;
 mod timer;
 mod work_ram;