diff --git a/src/processor/memory/mmio/apu.rs b/src/processor/memory/mmio/apu.rs
index fcb9ae3..618a396 100644
--- a/src/processor/memory/mmio/apu.rs
+++ b/src/processor/memory/mmio/apu.rs
@@ -106,10 +106,12 @@ const CYCLES_PER_FRAME: usize = 70224;
 impl Apu {
     pub fn init(&mut self) {
         let sample_rate = self.config.sample_rate.0;
-        let rb_len = sample_rate as usize;
+        let rb_len = sample_rate as usize / 60;
 
         let rb = AsyncHeapRb::<f32>::new(rb_len);
-        let (tx, mut rx) = rb.split();
+        let (mut tx, mut rx) = rb.split();
+
+        executor::block_on(tx.push_iter(vec![0.; rb_len - 1].into_iter())).unwrap();
 
         self.send_rb = Some(tx);