diff --git a/ncc/examples/ball.c b/ncc/examples/ball.c
index b47cb86..deb821e 100644
--- a/ncc/examples/ball.c
+++ b/ncc/examples/ball.c
@@ -9,7 +9,7 @@
 #define BALL_RADIUS 20
 #define AUDIO_LEN 8_000
 
-// RGBA pixels: 800 * 600
+// RGBA pixels
 u32 frame_buffer[FRAME_HEIGHT][FRAME_WIDTH];
 
 // Current ball position
@@ -58,7 +58,7 @@ void draw_ball()
 void update()
 {
     // Clear the frame buffer, set all pixels to black
-    memset32(frame_buffer, 0, 800 * 600);
+    memset32(frame_buffer, 0, sizeof(frame_buffer) / sizeof(u32));
 
     draw_ball();
 
diff --git a/vm/src/audio.rs b/vm/src/audio.rs
index e7c8b04..cee944f 100644
--- a/vm/src/audio.rs
+++ b/vm/src/audio.rs
@@ -76,7 +76,7 @@ impl AudioCallback for InputCB
         // Copy the samples to make them accessible to the audio thread
         INPUT_STATE.with_borrow_mut(|s| {
             s.input_tid = self.thread.id;
-            s.samples.clear();
+            s.samples.resize(buf.len(), 0);
             s.samples.copy_from_slice(buf);
         });
 
@@ -110,11 +110,6 @@ thread_local! {
     static INPUT_STATE: RefCell<InputState> = RefCell::new(InputState::default());
 }
 
-
-
-
-
-
 pub fn audio_open_output(thread: &mut Thread, sample_rate: Value, num_channels: Value, format: Value, cb: Value) -> Value
 {
     if thread.id != 0 {