diff --git a/lib/src/processor/memory/mmio/apu/channels.rs b/lib/src/processor/memory/mmio/apu/channels.rs
index 82a16bc..dc839a3 100644
--- a/lib/src/processor/memory/mmio/apu/channels.rs
+++ b/lib/src/processor/memory/mmio/apu/channels.rs
@@ -95,13 +95,18 @@ impl From<u8> for DutyCycle {
     }
 }
 
+const TWELVE_POINT_FIVE: [u8; 8] = [0, 0, 0, 0, 0, 0, 0, 1];
+const TWENTY_FIVE: [u8; 8] = [1, 0, 0, 0, 0, 0, 0, 1];
+const FIFTY: [u8; 8] = [1, 0, 0, 0, 0, 1, 1, 1];
+const SEVENTY_FIVE: [u8; 8] = [0, 1, 1, 1, 1, 1, 1, 0];
+
 impl DutyCycle {
-    fn as_waveform(&self) -> [u8; 8] {
+    fn get_waveform(&self, index: usize) -> u8 {
         match self {
-            DutyCycle::TwelvePointFive => [0, 0, 0, 0, 0, 0, 0, 1],
-            DutyCycle::TwentyFive => [1, 0, 0, 0, 0, 0, 0, 1],
-            DutyCycle::Fifty => [1, 0, 0, 0, 0, 1, 1, 1],
-            DutyCycle::SeventyFive => [0, 1, 1, 1, 1, 1, 1, 0],
+            DutyCycle::TwelvePointFive => TWELVE_POINT_FIVE[index],
+            DutyCycle::TwentyFive => TWENTY_FIVE[index],
+            DutyCycle::Fifty => FIFTY[index],
+            DutyCycle::SeventyFive => SEVENTY_FIVE[index],
         }
     }
 
@@ -167,7 +172,7 @@ impl PwmChannel {
                         self.wave_position = (self.wave_position + 1) % 8;
                         self.set_wave_timer();
                     }
-                    self.dac(self.duty_cycle.as_waveform()[self.wave_position])
+                    self.dac(self.duty_cycle.get_waveform(self.wave_position))
                 })
                 .collect()
         } else {