diff --git a/src/processor/memory/mmio/apu.rs b/src/processor/memory/mmio/apu.rs
index b1dd501..785d8e7 100644
--- a/src/processor/memory/mmio/apu.rs
+++ b/src/processor/memory/mmio/apu.rs
@@ -114,12 +114,6 @@ impl Default for Mixer {
     }
 }
 
-// impl Mixer {
-// fn mix(&self, sample: DacSample) -> [f32; 2] {
-// sample.mixed(self.vol_left, self.vol_right)
-// }
-// }
-
 #[derive(Clone, Copy)]
 struct DacSample {
     one: f32,
@@ -155,15 +149,12 @@ pub struct Apu {
     mixer: Mixer,
     div_apu: u8,
     buffer: Vec<DacSample>,
-    // converter: Samplerate,
     device: Device,
     config: StreamConfig,
     stream: Option<Stream>,
     send_buffer: Option<Sender<Vec<[f32; 2]>>>,
 }
 
-// const TARGET_SAMPLERATE: u32 = 192000;
-
 impl Default for Apu {
     fn default() -> Self {
         let host = cpal::default_host();
@@ -181,16 +172,6 @@ impl Default for Apu {
             .with_max_sample_rate()
             .config();
 
-        // config.buffer_size = BufferSize::Fixed(2048 * 2);
-
-        // let converter = Samplerate::new(
-        //     ConverterType::Linear,
-        //     TARGET_SAMPLERATE,
-        //     config.sample_rate.0,
-        //     2,
-        // )
-        // .unwrap();
-
         Self {
             mem: [0x0; MEM_SIZE],
             apu_enable: true,
@@ -199,7 +180,6 @@ impl Default for Apu {
             mixer: Mixer::default(),
             div_apu: 0,
             buffer: vec![],
-            // converter,
             device,
             config,
             stream: None,