diff --git a/lib/src/processor/memory/mmio/apu/downsampler.rs b/lib/src/processor/memory/mmio/apu/downsampler.rs
index d7ba281..926483a 100644
--- a/lib/src/processor/memory/mmio/apu/downsampler.rs
+++ b/lib/src/processor/memory/mmio/apu/downsampler.rs
@@ -1,7 +1,5 @@
 use crate::{connect::DownsampleType, constants::CLOCK_SPEED};
 
-const TIME_PER_CYCLE: f32 = 1. / CLOCK_SPEED as f32;
-
 struct Averager {
     accum: [f32; 2],
     num: usize,
@@ -48,7 +46,7 @@ pub(super) struct Downsampler {
 impl Downsampler {
     pub fn new(sample_rate: f32, algo: DownsampleType) -> Self {
         Self {
-            ratio: 1. / sample_rate,
+            ratio: CLOCK_SPEED as f32 / sample_rate,
             time_accum: 0.,
             average: match algo {
                 DownsampleType::Linear => Some(Averager::default()),
@@ -60,12 +58,12 @@ impl Downsampler {
     pub fn process(&mut self, signal: Vec<[f32; 2]>) -> Vec<[f32; 2]> {
         let mut output = vec![];
         for ref val in signal {
-            self.time_accum += TIME_PER_CYCLE;
+            self.time_accum += 1.;
             if let Some(ref mut averager) = self.average {
                 averager.push(val);
             }
             if self.time_accum >= self.ratio {
-                self.time_accum = 0.;
+                self.time_accum -= self.ratio;
                 output.push(if let Some(ref mut averager) = self.average {
                     averager.finish()
                 } else {