diff --git a/01-play-sine/src/main.rs b/01-play-sine/src/main.rs
index be2a3bd..db3cce2 100644
--- a/01-play-sine/src/main.rs
+++ b/01-play-sine/src/main.rs
@@ -29,12 +29,12 @@ fn main() -> Result<(), Box<dyn std::error::Error>> {
         .register();
 
     let sample_rate = 48000;
-    let channel_count = 2;
+    let channel_count : usize = 2;
 
     let mut audio_info = AudioInfoRaw::new();
     audio_info.set_format(AudioFormat::F32LE);
     audio_info.set_rate(sample_rate);
-    audio_info.set_channels(channel_count);
+    audio_info.set_channels(channel_count as u32);
 
     let param_bytes = PodSerializer::serialize(
         Cursor::new(vec![]),
@@ -83,7 +83,7 @@ fn main() -> Result<(), Box<dyn std::error::Error>> {
                 }
             };
 
-            let stride = std::mem::size_of::<f32>() * (channel_count as usize);
+            let stride = std::mem::size_of::<f32>() * channel_count;
             let datas = buffer.datas_mut();
 
             let data = &mut datas[0];
@@ -104,9 +104,9 @@ fn main() -> Result<(), Box<dyn std::error::Error>> {
                     let phi = pi2 * time_secs * sine_freq;
                     let value = 0.5 + 0.5 * f32::sin(phi);
 
-                    slice[2 * i] = value;
-                    slice[2 * i + 1] = value;
-                    samples_written += 2;
+                    slice[channel_count*i + 0] = value;
+                    slice[channel_count*i + 1] = value;
+                    samples_written += 1;
                 }
             }